1 iphone开发笔记 2 3 退回输入键盘 4 - (BOOL) textFieldShouldReturn:(id)textField{ 5 [textField resignFirstResponder]; 6 } 7 8 CGRect 9 CGRect frame = CGRectMake (origin.x, origin.y, size.width, size.height)；矩形 10 NSStringFromCGRect(someCG) 把CGRect结构转变为格式化字符串； 11 CGRectFromString(aString) 由字符串恢复出矩形； 12 CGRectInset(aRect) 创建较小或较大的矩形（中心点相同），＋较小 －较大 13 CGRectIntersectsRect(rect1, rect2) 判断两矩形是否交叉，是否重叠 14 CGRectZero 高度和宽度为零的／位于（0，0）的矩形常量 15 16 CGPoint & CGSize 17 CGPoint aPoint = CGPointMake(x, y); 18 CGSize aSize = CGSizeMake(width, height); 19 20 设置透明度 21 [myView setAlpha:value]; (0.0 < value < 1.0) 22 23 设置背景色 24 [myView setBackgroundColor:[UIColor redColor]]; 25 (blackColor;darkGrayColor;lightGrayColor; 26 whiteColor;grayColor; redColor; greenColor; 27 blueColor; cyanColor;yellowColor; 28 magentaColor;orangeColor;purpleColor; 29 brownColor; clearColor; ) 30 31 自定义颜色 32 UIColor *newColor = [[UIColor alloc] 33 initWithRed:(float) green:(float) blue:(float) alpha:(float)]; 34 0.0~1.0 35 36 竖屏 37 320X480 38 39 横屏 40 480X320 41 42 状态栏高 (显示时间和网络状态) 43 20 像素 44 45 导航栏、工具栏高(返回) 46 44像素 47 48 隐藏状态栏 49 [[UIApplication shareApplication] setStatusBarHidden: YES animated:NO] 50 51 横屏 52 [[UIApplication shareApplication] 53 setStatusBarOrientation:UIInterfaceOrientationLandscapeRight]. 54 55 屏幕变动检测 56 orientation == UIInterfaceOrientationLandscapeLeft 57 58 全屏 59 window=[[UIWindow alloc] initWithFrame:[UIScreen mainScreen] bounds]; 60 61 自动适应父视图大小： 62 aView.autoresizingSubviews = YES; 63 aView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | 64 UIViewAutoresizingFlexibleHeight); 65 66 定义按钮 67 UIButton *scaleUpButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 68 [scaleUpButton setTitle:@"放 大" forState:UIControlStateNormal]; 69 scaleUpButton.frame = CGRectMake(40, 420, 100, 40); 70 [scaleUpButton addTarget:self 71 action:@selector(scaleUp) 72 forControlEvents:UIControlEventTouchUpInside]; 73 74 设置视图背景图片 75 UIImageView *aView; 76 [aView setImage:[UIImage imageNamed:@”name.png”]]; 77 view1.backgroundColor = [UIColor colorWithPatternImage: 78 [UIImage imageNamed:@"image1.png"]]; 79 80 自定义UISlider的样式和滑块 81 82 我们使用的是UISlider的setMinimumTrackImage，和setMaximumTrackImage方法来定义图片的，这两个方法可以设置滑块左边和右边的图片的，不过如果用的是同一张图片且宽度和控件宽度基本一致，就不会有变形拉伸的后果，先看代码，写在 viewDidLoad中： 83 //左右轨的图片 84 UIImage *stetchLeftTrack= [UIImage imageNamed:@"brightness_bar.png"]; 85 UIImage *stetchRightTrack = [UIImage imageNamed:@"brightness_bar.png"]; 86 //滑块图片 87 UIImage *thumbImage = [UIImage imageNamed:@"mark.png"]; 88 89 UISlider *sliderA=[[UISlider alloc]initWithFrame:CGRectMake(30, 320, 257, 7)]; 90 sliderA.backgroundColor = [UIColor clearColor]; 91 sliderA.value=1.0; 92 sliderA.minimumValue=0.7; 93 sliderA.maximumValue=1.0; 94 95 [sliderA setMinimumTrackImage:stetchLeftTrack forState:UIControlStateNormal]; 96 [sliderA setMaximumTrackImage:stetchRightTrack forState:UIControlStateNormal]; 97 //注意这里要加UIControlStateHightlighted的状态，否则当拖动滑块时滑块将变成原生的控件 98 [sliderA setThumbImage:thumbImage forState:UIControlStateHighlighted]; 99 [sliderA setThumbImage:thumbImage forState:UIControlStateNormal]; 100 //滑块拖动时的事件 101 [sliderA addTarget:self action:@selector(sliderValueChanged:) forControlEvents:UIControlEventValueChanged]; 102 //滑动拖动后的事件 103 [sliderA addTarget:self action:@selector(sliderDragUp:) forControlEvents:UIControlEventTouchUpInside]; 104 105 [self.view addSubview:sliderA]; 106 107 为了大家实验方便，我附上背景图brightness_bar.png和滑块图mark.png 108 http://pic002.cnblogs.com/images/2011/162291/2011121611431816.png 109 http://pic002.cnblogs.com/images/2011/162291/2011121611432897.png 110 111 -(IBAction)sliderValueChanged:(id)sender{ 112 UISlider *slider = (UISlider *) sender; 113 NSString *newText = [[NSString alloc] initWithFormat:@”%d”, (int)(slider.value + 0.5f)]; 114 label.text = newText; 115 } 116 117 活动表单 118 <UIActionSheetDelegate> 119 120 - (IBActive) someButtonPressed:(id) sender 121 { 122 UIActionSheet *actionSheet = [[UIActionSheet alloc] 123 initWithTitle:@”Are you sure?” 124 delegate:self 125 cancelButtonTitle:@”No way!” 126 destructiveButtonTitle:@”Yes, I’m Sure!” 127 otherButtonTitles:nil]; 128 [actionSheet showInView:self.view]; 129 [actionSheet release]; 130 } 131 132 警告视图 133 <UIAlertViewDelegate> 134 135 - (void) actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger) buttonIndex 136 { 137 if(buttonIndex != [actionSheet cancelButtonIndex]) 138 { 139 NSString *message = [[NSString alloc] initWithFormat:@”You can 140 breathe easy, everything went OK.”]; 141 UIAlertView *alert = [[UIAlertView alloc] 142 initWithTitle:@”Something was done” 143 message:message 144 delegate:self 145 cancelButtonTitle:@”OK” 146 otherButtonTitles:nil]; 147 [alert show]; 148 [alert release]; 149 [message release]; 150 } 151 } 152 153 动画效果 154 -(void)doChange:(id)sender 155 { 156 if(view2 == nil) 157 { 158 [self loadSec]; 159 } 160 [UIView beginAnimations:nil context:NULL]; 161 [UIView setAnimationDuration:1]; 162 [UIView setAnimationTransition:([view1 superview]?UIViewAnimationTransitionFlipFromLeft:UIViewAnimationTransitionFlipFromRight)forView:self.view cache:YES]; 163 164 if([view1 superview]!= nil) 165 { 166 [view1 removeFromSuperview]; 167 [self.view addSubview:view2]; 168 169 }else { 170 171 [view2 removeFromSuperview]; 172 [self.view addSubview:view1]; 173 } 174 [UIView commitAnimations]; 175 } 176 177 Table View <UITableViewDateSource> 178 #pragma mark - 179 #pragma mark Table View Data Source Methods 180 //指定分区中的行数，默认为1 181 - (NSInteger)tableView:(UITableView *)tableView 182 numberOfRowsInSection:(NSInteger)section 183 { 184 return [self.listData count]; 185 } 186 187 //设置每一行cell显示的内容 188 - (UITableViewCell *)tableView:(UITableView *)tableView 189 cellForRowAtIndexPath:(NSIndexPath *)indexPath 190 { 191 static NSString *SimpleTableIndentifier = @"SimpleTableIndentifier"; 192 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:SimpleTableIndentifier]; 193 if (cell == nil) { 194 cell = [[[UITableViewCell alloc] 195 initWithStyle:UITableViewCellStyleSubtitle 196 reuseIdentifier:SimpleTableIndentifier] 197 autorelease]; 198 } 199 UIImage *image = [UIImage imageNamed:@"13.gif"]; 200 cell.imageView.image = image; 201 202 NSUInteger row = [indexPath row]; 203 cell.textLabel.text = [listData objectAtIndex:row]; 204 cell.textLabel.font = [UIFont boldSystemFontOfSize:20]; 205 206 if(row < 5) 207 cell.detailTextLabel.text = @"Best friends"; 208 else 209 cell.detailTextLabel.text = @"friends"; 210 return cell; 211 } 212 213 图像、文本标签和详细文本标签 214 215 图像：如果设置图像，则它显示在文本的左侧； 文本标签：这是单元的主要文本（UITableViewCellStyleDefault 只显示文本标签）；详细文本标签：这是单元的辅助文本，通常用作解释性说明或标签 216 217 UITableViewCellStyleSubtitle 218 UITableViewCellStyleDefault 219 UITableViewCellStyleValue1 220 UITableViewCellStyleValue2 221 222 <UITableViewDelegate> 223 #pragma mark - 224 #pragma mark Table View Delegate Methods 225 //把每一行缩进级别设置为其行号 226 - (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath 227 { 228 NSUInteger row = [indexPath row]; 229 return row; 230 } 231 //获取传递过来的indexPath值 232 - (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath 233 { 234 NSUInteger row = [indexPath row]; 235 if (row == 0) 236 return nil; 237 return indexPath; 238 } 239 240 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 241 { 242 NSUInteger row = [indexPath row]; 243 NSString *rowValue = [listData objectAtIndex:row]; 244 NSString *message = [[NSString alloc] initWithFormat:@"You selected %@",rowValue]; 245 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Row Selected" 246 message:message 247 delegate:nil 248 cancelButtonTitle:@"Yes, I did!" 249 otherButtonTitles:nil]; 250 [alert show]; 251 [alert release]; 252 [message release]; 253 [tableView deselectRowAtIndexPath:indexPath animated:YES]; 254 } 255 256 //设置行的高度 257 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath 258 { 259 return 40; 260 } 261 262 NavigationController 推出push 推出pop 263 [self.navigationController pushViewController:_detailController animated:YES]; 264 [self.navigationController popViewControllerAnimated:YES]; 265 266 Debug: 267 NSLog(@"%s %d", __FUNCTION__, __LINE__); 268 269 点击textField外的地方回收键盘 270 271 先定义一个UIControl类型的对象，在上面可以添加触发事件，令SEL实践为回收键盘的方法,最后将UIControl的实例加到当前View上。 272 UIControl *m_control = [[UIControl alloc] initWithFrame:CGRectMake(0, 0, 320, 480)]; 273 [m_control addTarget:self action:@selector(keyboardReturn) 274 forControlEvents:UIControlEventTouchUpInside]; 275 [self.view addSubview:m_control]; 276 277 - (void) keyboardReturn 278 { 279 [aTextField resignFirstResponder]; 280 } 281 282 键盘覆盖输入框 283 当键盘调出时将输入框覆盖时，可以用下方法： 284 - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField 285 { 286 [self.view setFrame:CGRectMake(0, -100, 320, 480) ]; 287 return YES; 288 } 289 - (BOOL)textFieldShouldEndEditing:(UITextField *)textField 290 { 291 [self.view setFrame:CGRectMake(0, 0, 320, 480)]; 292 return YES; 293 } 294 当准备输入时，将视图的位置上调100，这样键盘就不能覆盖到输入框。 295 296 当依赖注入方法不好使时，可以在AppDelegate内申明一个全局的控制器实例_anotherViewController，在另一个需要使用_anotherViewController的地方定义以下委托方法，使用共享的UIApplication实例来获取该委托的引用 297 SomeAppDelegate *appDelegate = (SomeAppDelegate *)[[UIApplication sharedApplication] delegate]; 298 _anotherViewController = appDelegate._anotherViewController; 299 300 UIViewController内建Table View 301 302 纯代码在UIViewController控制器内建Table View 303 @interface RootViewController : UIViewController <UITableViewDelegate, UITableViewDataSource> { 304 NSArray *timeZoneNames; 305 } 306 @property (nonatomic,retain) NSArray *timeZoneNames; 307 @end 308 309 (void) loadView 310 { 311 UITableView *tableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]] style: UITableViewStylePlain]; 312 tableView.autoresizingMask = (UIViewAutoresizingFlexibleHeight | UIViewAutoresizingWidth); 313 tableView.delegate = self; 314 tableView.dataSource = self; 315 [tableView reloadData]; 316 317 self.view = tableView; 318 [tableView release]; 319 } 320 321 322 将plist文件中的数据赋给数组 323 NSString *thePath = [[NSBundle mainBundle] pathForResource:@"States" ofType:@"plist"]; 324 NSArray *array = [NSArray arrayWithContentsOfFile:thePath]; 325 326 UITouch 327 手指的触摸范围：64X64 328 329 #pragma mark - 330 #pragma mark Touch Events 331 332 - (void)touchesBegan:(NSSet *) touches withEvent:(UIEvent *) event { 333 originFrame = bookCover.frame; 334 NSLog(@"%s %d", __FUNCTION__,__LINE__); 335 336 if ([touches count] == 2) 337 { 338 NSArray *twoTouches = [touches allObjects]; 339 UITouch *firstTouch = [twoTouches objectAtIndex:0]; 340 UITouch *secondTouch = [twoTouches objectAtIndex:1]; 341 CGPoint firstPoint = [firstTouch locationInView:bookCover]; 342 CGPoint secondPoint = [secondTouch locationInView:bookCover]; 343 344 CGFloat deltaX = secondPoint.x - firstPoint.x; 345 CGFloat deltaY = secondPoint.y - firstPoint.y; 346 initialDistance = sqrt(deltaX * deltaX + deltaY * deltaY ); 347 frameX = bookCover.frame.origin.x; 348 frameY = bookCover.frame.origin.y; 349 frameW = bookCover.frame.size.width; 350 frameH = bookCover.frame.size.height; 351 NSLog(@"%s %d", __FUNCTION__,__LINE__); 352 } 353 } 354 355 - (void)touchesMoved:(NSSet *) touches withEvent:(UIEvent *) event { 356 357 if([touches count] == 2) 358 { 359 NSLog(@"%s %d", __FUNCTION__,__LINE__); 360 361 NSArray *twoTouches = [touches allObjects]; 362 UITouch *firstTouch = [twoTouches objectAtIndex:0]; 363 UITouch *secondTouch = [twoTouches objectAtIndex:1]; 364 365 CGPoint firstPoint = [firstTouch locationInView:bookCover]; 366 CGPoint secondPoint = [secondTouch locationInView:bookCover]; 367 368 CGFloat deltaX = secondPoint.x - firstPoint.x; 369 CGFloat deltaY = secondPoint.y - firstPoint.y; 370 CGFloat currentDistance = sqrt(deltaX * deltaX + deltaY * deltaY ); 371 372 if (initialDistance == 0) { 373 initialDistance = currentDistance; 374 } 375 else if (currentDistance != initialDistance) 376 { 377 CGFloat changedDistance = currentDistance - initialDistance; 378 NSLog(@"changedDistance = %f",changedDistance); 379 [bookCover setFrame:CGRectMake(frameX - changedDistance / 2, 380 frameY - (changedDistance * frameH) / (2 * frameW), 381 frameW + changedDistance, 382 frameH + (changedDistance * frameH) / frameW)]; 383 } 384 } 385 } 386 387 - (void)touchesEnded:(NSSet *) touches withEvent:(UIEvent *) event { 388 UITouch *touch = [touches anyObject]; 389 390 UITouch双击图片变大/还原 391 if ([touch tapCount] == 2) 392 { 393 NSLog(@"%s %d", __FUNCTION__,__LINE__); 394 395 if (!flag) { 396 [bookCover setFrame:CGRectMake(bookCover.frame.origin.x - bookCover.frame.size.width / 2, 397 bookCover.frame.origin.y - bookCover.frame.size.height / 2, 398 2 * bookCover.frame.size.width, 399 2 * bookCover.frame.size.height)]; 400 flag = YES; 401 } 402 else { 403 [bookCover setFrame:CGRectMake(bookCover.frame.origin.x + bookCover.frame.size.width / 4, bookCover.frame.origin.y + bookCover.frame.size.height / 4, 404 bookCover.frame.size.width / 2, bookCover.frame.size.height / 2)]; 405 flag = NO; 406 } 407 } 408 } 409 410 Get the Location of Touches 411 (CGPoint)locationInView:(UIView *)view 412 (CGPoint)previousLocationInView:(UIView *)view 413 view window 414 415 Getting Touch Attributes 416 tapCount(read only) timestamp(read only) phase(read only) 417 418 Getting a Touch Object's Gesture Recognizers 419 gestureRecognizers 420 421 Touch Phase 422 UITouchPhaseBegan 423 UITouchPhaseMoved 424 UITouchPhaseStationary 425 UITouchPhaseEnded 426 UITouchPhaseCancelled 427 428 从Plist里读内容 429 NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"book" ofType:@"plist"]; 430 NSDictionary *dictionary = [[NSDictionary alloc] initWithContentsOfFile:plistPath]; 431 NSString *book = [dictionary objectForKey:bookTitle]; 432 [textView setText:book]; 433 434 (void) initialize { 435 NSUserDefaults = [NSUserDefaults standardUserDefaults]; 436 NSDictionary *appDefaults = [NSDictionary dictionaryWithObject:@"YES" forKey:@"DeleteBackup"]; 437 [defaults registerDefaults:appDefaults]; 438 } 439 440 To get a value of a default, use the valueForKey: method: 441 [[theDefaultsController values] valueForKey:@"userName"]; 442 To set a value for a default, use setValue:forKey: 443 [[theDefaultsController values] setValue:newUserName forKey:@"userName"]; 444 445 [[NSUserDefaults standardUserDefaults] setValue:aVale forKey:aKey]; 446 [[NSUserDefaults standardUserDefaults] valueForKey:aKey]; 447 448 获取Documents目录 449 NSArray *paths = NSSearchPathForDictionariesInDomains(NSDocumentDirectory, 450 NSUserDomainMask, YES); 451 NSString *documentsDirectory = [paths objectAtIndex:0]; 452 NSString *filename = [documentsDirectory 453 stringByAppendingPathComponent:@"theFile.txt"]; 454 455 获取tmp目录 456 NSString *tempPath = NSTemporaryDirectory(); 457 NSString *tempFile = [tempPath stringByAppendingPathComponent:@"tempFile.txt"]; 458 459 [[NSUserDefaults standardUserDefaults] setObject:data forKey:@"someKey"]; 460 [[NSUserDefaults standardUserDefaults] objectForKey:aKey]; 461 462 自定义NavigationBar 463 navigationBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)]; 464 [navigationBar setBarStyle:UIBarStyleBlackOpaque]; 465 466 myNavigationItem = [[UINavigationItem alloc] initWithTitle:@"Setting"]; 467 [navigationBar setItems:[NSArray arrayWithObject:myNavigationItem]]; 468 [self.view addSubview:navigationBar]; 469 470 backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:self action:@selector(back)]; 471 myNavigationItem.leftBarButtonItem = backButton; 472 473 474 利用Safari打开一个链接 475 NSURL *url = [NSURL URLWithString:@"http://www.cnblogs.com/tracy-e/"]; 476 [[UIApplication sharedApplication] openURL:url]; 477 478 利用UIWebView显示pdf文件、网页。。。 479 webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)]; 480 [webView setDelegate:self]; 481 [webView setScalesPageToFit:YES]; 482 [webView setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight]; 483 [webView setAllowsInlineMediaPlayback:YES]; 484 [self.view addSubview:webView]; 485 NSString *pdfPath = [[NSBundle mainBundle] pathForResource:@"ojc" ofType:@"pdf"]; 486 NSURL *url = [NSURL fileURLWithPath:pdfPath]; 487 NSURLRequest *request = [NSURLRequest requestWithURL:url 488 cachePolicy:NSURLRequestUseProtocolCachePolicy 489 timeoutInterval:5]; 490 [webView loadRequest:request]; 491 492 493 [myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL 494 URLWithString: @"http://www.cnblogs.com/tracy-e/"]]]; 495 496 NSString *errorString = [NSString stringWithFormat:@"<html><center><font size= 497 +5 color ='red'>An Error Occurred:<br>%@</fone></center></html>",error]; 498 [myWebView loadHTMLString:errorString baseURL:nil]; 499 500 //Stopping a load request when the view is to disappear 501 - (void)viewWillDisappear:(BOOL)animate{ 502 if ([myWebView loading]){ 503 [myWebView stopLoading]; 504 } 505 myWebView.delegate = nil; 506 [UIApplication shareApplication].networkActivityIndicatorVisible = NO; 507 } 508 509 汉字转码 510 NSString *oriString = @"\u67aa\u738b"; 511 NSString *escapedString = [oriString 512 stringByReplacingPercentEscapesUsingEncoding: NSUTF8StringEncoding]; 513 514 515 Checking for background support on earlier versions of iOS 516 UIDevice *device = [UIDevice currentDevice]; 517 BOOL backgroundSupported = NO; 518 if ([device respondsToSelector:@selector(isMultitaskingSupported)]){ 519 backgroundSupported = device.multitaskingSupported; 520 } 521 522 Being a Responsible,Multitasking-Aware Application 523 # Do not make any OpenGL ES calls from your code. 524 # Cancel any Bonjour-related services before being suspended. 525 # Be prepared to handle connection failures in your network-based sockets. 526 # Save your application state before moving to the background. 527 # Release any unneeded memory when moving to the background. 528 # Stop using shared system resources before being suspended. 529 # Avoid updating your windows and views. 530 # Respond to connect and disconnect notification for external accessories. 531 # Clean up resource for active alerts when moving to the background. 532 # Remove sensitive information from views before moving to the background. 533 # Do minimal work while running in the background. 534 535 Handing the Keyboard notifications 536 //Call this method somewhere in your view controller setup code 537 - (void) registerForKeyboardNotifications{ 538 539 [[NSNotificationCenter defaultCenter] addObserver:self 540 selector:@selector(keyboardWasShown:) 541 name:UIKeyboardDidShowNotification 542 object:nil]; 543 [[NSNotificationCenter defaultCenter] addObserver:self 544 selector:@selector(keyboardWasHidden:) 545 name:UIKeyboardDidHideNotification 546 object:nil]; 547 548 } 549 550 //Called when the UIKeyboardDidShowNotification is sent 551 - (void)keyboardWasShown:(NSNotification *) aNotification{ 552 if(keyboardShown) 553 return; 554 NSDictionary *info = [aNotification userInfo]; 555 556 //get the size of the keyboard. 557 NSValue *aValue = [info objectForKey:UIKeyboardFrameBeginUserInfoKey]; 558 CGSize keyboardSize = [aValue CGRectValue].size; 559 560 //Resize the scroll view 561 CGRect viewFrame = [scrollView frame]; 562 viewFrame.size.height -= keyboardSize.height; 563 564 //Scroll the active text field into view 565 CGRect textFieldRect = [activeField frame]; 566 [scrollView scrollRectToVisible:textFieldRect animated:YES]; 567 568 keyboardShown = YES; 569 } 570 571 //Called when the UIKeyboardDidHideNotification is sent 572 - (void)keyboardWasHidden:(NSNotification *) aNotification{ 573 NSDictionary *info = [aNotification userInfo]; 574 575 //Get the size of the keyboard. 576 NSValue *aValue = [info objectForKey:UIKeyboardFrameEndUserInfoKey]; 577 CGSize keyboardSize = [aValue CGRectValue].size; 578 579 //Reset the height of the scroll view to its original value 580 CGRect viewFrame = [scrollView Frame]; 581 viewFrame.size.height += keyboardSize.height; 582 scrollView.frame = viewFrame; 583 584 keyboardShown = NO; 585 } 586 587 点击键盘的next按钮，在不同的textField之间换行 588 //首先给不同的textField赋不同的且相邻的tag值 589 - (BOOL)textFieldShouldReturn:(UITextField *)textField 590 { 591 if ([textField returnKeyType] != UIReturnKeyDone) 592 { 593 NSInteger nextTag = [textField tag] + 1; 594 UIView *nextTextField = [[self tableView] viewWithTag:nextTag]; 595 [nextTextField becomeFirstResponder]; 596 } 597 else { 598 [textField resignFirstResponder]; 599 } 600 return YES; 601 } 602 603 Configuring a date formatter 604 - (void)viewDidLoad { 605 [super viewDidLoad]; 606 dateFormatter = [[NSDateFormatter alloc] init]; 607 [dateFormatter setGeneratesCalendarDates:YES]; 608 [dateFormatter setLocale:[NSLocale currentLocale]]; 609 [dateFormatter setCalendar:[NSCalendar autoupdatingCurrentCalendar]]; 610 [dateFormatter setTimeZone:[NSTimeZone defaultTimeZone]]; 611 [dateFormatter setDateStyle:NSDateFormatterShortStyle]; 612 DOB.placeholder = [NSString stringWithFormat:@"Example: %@",[dateFormatter stringFromDate:[NSDate date]]]; 613 } 614 615 - (void)textFieldDidEndEditing:(UITextField *)textField{ 616 [textField resignFirstResponder]; 617 if ([textField.text isEqualToString:@""]) 618 return; 619 switch (textField.tag){ 620 case DOBField: 621 NSDate *theDate = [dateFormatter dateFromString:textField.text]; 622 if (theDate) 623 [inputDate setObject:theDate forKey:MyAppPersonDOBKey]; 624 break; 625 default: 626 break; 627 } 628 } 629 630 tableView的cell高度 631 632 tableView的cell高度除了在delegate中指定外，还可以在任意位置以[tableView setRowHeight:44]的方式指定 633 634 [[self navigationItem] setLeftBarButtonItem:[self editButtonItem]]; 635 636 - (void)setEditing:(BOOL)editing animated:(BOOL)animated{ 637 [super setEditing:editing animated:animated]; 638 if (editing){ 639 ...... 640 } 641 else{ 642 ...... 643 } 644 } 645 646 One added a subview to a view, release the subview to avoid the extra retain count of it, Because when you insert a view as a subview using addSubview:, the subview is retained by its superview. When you remove the subview from its superview using the removeFromSuperview: method, subview is autoreleased. 647 648 为UINavigationBar设置背景图片 649 在iPhone开发中, 有时候我们想给导航条添加背景图片, 实现多样化的导航条效果, 用其他方法往往无法达到理想的效果, 经过网上搜索及多次实验, 确定如下最佳实现方案: 650 为UINavigatonBar增加如下Category(类别:提供一种为某个类添加方法而又不必编写子类的途径,类别只能添加成员函数，不能添加数据成员): 651 652 @implementation UINavigationBar (CustomImage) 653 - (void)drawRect:(CGRect)rect { 654 UIImage *image = [UIImage imageNamed: @"NavigationBar.png"]; 655 [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; 656 } 657 @end 658 659 例如, 在我的项目中, 添加如下代码: 660 ///////////////////////////////////////////////////////// 661 /* input: The image and a tag to later identify the view */ 662 @implementation UINavigationBar (CustomImage) 663 - (void)drawRect:(CGRect)rect { 664 UIImage *image = [UIImage imageNamed: @"title_bg.png"]; 665 [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; 666 } 667 @end 668 ///////////////////////////////////////////////////////// 669 @implementation FriendsPageViewController 670 // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. 671 - (void)viewDidLoad { 672 self.navigationBar.tintColor = [UIColor purpleColor]; 673 674 [self initWithRootViewController:[[RegPageViewController alloc] init]]; 675 [super viewDidLoad]; 676 } 677 ...... 678 实现的效果如下图: 679 680 681 转载，原文地址 http://blog.csdn.net/wave_1102/archive/2009/11/04/4768212.aspx 682 683 为UINavigationBar添加自定义背景 684 685 @implementation UINavigationBar (UINavigationBarCategory) 686 687 - (void)drawRect:(CGRect)rect { 688 //颜色填充 689 // UIColor *color = [UIColor redColor]; 690 // CGContextRef context = UIGraphicsGetCurrentContext(); 691 // CGContextSetFillColor(context, CGColorGetComponents( [color CGColor])); 692 // CGContextFillRect(context, rect); 693 // self.tintColor = color; 694 //图片填充 695 UIColor *color = [UIColor colorWithRed:46.0f/255.0f 696 green:87.0f/255.0f blue:29.0f/255.0f alpha:1.0f]; 697 698 UIImage *img = [UIImage imageNamed: @"bg.png"]; 699 [img drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; 700 701 self.tintColor = color; 702 } 703 704 @end 705 706 加载图片要及时release 707 708 你还在使用myImage = [UIImage imageNamed:@"icon.png"]; 吗？ 709 710 如题，是不是大家为了方便都这样加载图片啊 711 712 myImage = [UIImage imageNamed:@"icon.png"]; 713 714 那么小心了 715 716 这种方法在一些图片很少，或者图片很小的程序里是ok的。 717 718 但是，在大量加载图片的程序里，请千万不要这样做。 719 720 为什么呢 ？？？？？？？ 721 722 这种方法在application bundle的顶层文件夹寻找由供应的名字的图象。 如果找到图片，装载到iPhone系统缓存图象。那意味图片是(理论上)放在内存里作为cache的。 723 724 试想你图片多了，是什么后果？ 725 726 图片cache极有可能不会响应 memory warnings and release its objects 727 728 所以，用图片的时候一定要小心的alloc和release。 729 730 推荐使用 NSString *path = [[NSBundle mainBundle] pathForResource:@"icon" ofType:@"png"]; 731 732 myImage = [UIImage imageWithContentsOfFile:path]; 733 734 // Todo use of myImage 735 736 [myImage release]; 737 738 From: http://www.cocoachina.com/bbs/simple/?t27420.html 739 740 uiwebview打开doc,pdf文件 741 UIWebView *webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 55, 320, 300)]; 742 webView.delegate = self; 743 webView.multipleTouchEnabled = YES; 744 webView.scalesPageToFit = YES; 745 746 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 747 NSString *documentsDirectory = [paths objectAtIndex:0]; 748 NSString *docPath = [documentsDirectory stringByAppendingString:@"/doc2003_1.doc"]; NSLog(@"#######%@",docPath); 749 750 NSURL *url = [NSURL fileURLWithPath:docPath]; 751 NSURLRequest *request = [NSURLRequest requestWithURL:url]; 752 [webView loadRequest:request]; 753 754 [self.view addSubview:webView]; 755 [webView release]; 756 757 From:http://blog.csdn.net/dadalan/archive/2010/10/22/5959301.aspx 758 759 iPhone游戏中既播放背景音乐又播放特效声音的办法 760 761 有时候在 iPhone 游戏中，既要播放背景音乐，同时又要播放比如枪的开火音效。此时您可以试试以下方法 762 763 NSString *musicFilePath = [[NSBundle mainBundle] pathForResource:fileName ofType:@"wav"]; //创建音乐文件路径 764 NSURL *musicURL = [[NSURL alloc] initFileURLWithPath:musicFilePath]; 765 AVAudioPlayer* musicPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:musicURL error:nil]; 766 [musicURL release]; 767 [musicPlayer prepareToPlay]; 768 //[musicPlayer setVolume:1]; //设置音量大小 769 //musicPlayer .numberOfLoops = -1;//设置音乐播放次数 -1为一直循环 770 771 要导入框架 AVFoundation.framework，头文件中 #import <AVFoundation/AVFoundation.h>；做成类的话则更方便。 772 773 From: http://blog.csdn.net/dadalan/archive/2010/10/19/5950493.aspx 774 775 NSNotificationCenter用于增加回调函数 776 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_willBecomeActive) name:UIApplicationDidBecomeActiveNotification object:nil]; 777 778 UINavigationBar 背景Hack 779 LOGO_320×44.png 图片显示在背景上， 780 781 @implementation UINavigationBar (UINavigationBarCategory) 782 - (void)drawRect:(CGRect)rect { 783 //加入旋转坐标系代码 784 // Drawing code 785 UIImage *navBarImage = [UIImage imageNamed:@"LOGO_320×44.png"]; 786 CGContextRef context = UIGraphicsGetCurrentContext(); 787 CGContextTranslateCTM(context, 0.0, self.frame.size.height); 788 CGContextScaleCTM(context, 1.0, -1.0); 789 790 CGPoint center=self.center; 791 792 CGImageRef cgImage= CGImageCreateWithImageInRect(navBarImage.CGImage, CGRectMake(0, 0, 1, 44)); 793 CGContextDrawImage(context, CGRectMake(center.x-160-80, 0, 80, self.frame.size.height), cgImage); 794 CGContextDrawImage(context, CGRectMake(center.x-160, 0, 320, self.frame.size.height), navBarImage.CGImage); 795 CGContextDrawImage(context, CGRectMake(center.x+160, 0, 80, self.frame.size.height), cgImage); 796 } 797 @end 798 799 old code 800 CGContextDrawImage(context, CGRectMake(0, 0, self.frame.size.width, self.frame.size.height), navBarImage.CGImage); 801 802 hack 过logo 不再拉伸 803 804 From: http://blog.163.com/fengyi1103@126/blog/static/13835627420106279102671/ 805 806 清除电话号码中的其他符号（源码） 807 808 最近从通讯录读取电话号码，读出得号码如：134－1814－****。 809 而我需要的为11位纯数字，一直找方法解决此问题，今天终于找到了。。 810 分享一下…… 811 812 代码如下： 813 814 NSString *originalString = @"(123) 123123 abc"; 815 NSMutableString *strippedString = [NSMutableString 816 stringWithCapacity:originalString.length]; 817 818 NSScanner *scanner = [NSScanner scannerWithString:originalString]; 819 NSCharacterSet *numbers = [NSCharacterSet 820 characterSetWithCharactersInString:@"0123456789"]; 821 822 while ([scanner isAtEnd] == NO) { 823 NSString *buffer; 824 if ([scanner scanCharactersFromSet:numbers intoString:&buffer]) { 825 [strippedString appendString:buffer]; 826 } 827 // --------- Add the following to get out of endless loop 828 else { 829 [scanner setScanLocation:([scanner scanLocation] + 1)]; 830 } 831 // --------- End of addition 832 } 833 834 NSLog(@"%@", strippedString); // "123123123" 835 836 From： http://stackoverflow.com/questions/1129521/remove-all-but-numbers-from-nsstring 837 838 839 正则判断：字符串只包含字母和数字 840 841 NSString *mystring = @"Letter1234"; 842 NSString *regex = @"[a-z][A-Z][0-9]"; 843 844 NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex]; 845 846 if ([predicate evaluateWithObject:mystring] == YES) { 847 //implement 848 } 849 850 851 一行代码设置 UITableViewCell 与导航条间距 852 853 UITableView 的 cell 默认出现在 uitableview 的第一行，如果你想自定义 UITableViewCell 与导航条间距的话，可以使用下面这行代码 854 855 tableview.tableHeaderView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 5, 20)]autorelease]; 856 857 From: http://blog.163.com/fengyi1103@126/blog/static/1383562742010101611107492/ 858 859 860 修改 UITableview 滚动条颜色的方法 861 862 UITableview 的滚动条默认颜色是黑色的，如果 UItableview 背景也是深颜色，则滚动条会变的很不明显。您可以用下面这行代码来改变滚动条的颜色 863 864 self.tableView.indicatorStyle=UIScrollViewIndicatorStyleWhite; 865 866 当然，最后的 “White” 也可以换成其它颜色。 867 868 869 下文件之前获取到文件大小的代码 870 871 下面这段代码，能实现在下载文件之前获得文件大小，应用在软件里，能在很大程度上改善用户体验 872 873 [m_pASIHTTPRequest setDidReceiveResponseHeadersSelector:@selector(didReceiveResponseHeaders:)]; 874 875 - (void)didReceiveResponseHeaders:(ASIHTTPRequest *)request 876 { 877 NSLog(@"didReceiveResponseHeaders %@",[m_request.responseHeaders valueForKey:@"Content-Length"]); 878 ｝ 879 880 网络编程总结 iphone 881 882 一：确认网络环境3G/WIFI 883 884 1. 添加源文件和framework 885 886 开发Web等网络应用程序的时候，需要确认网络环境，连接情况等信息。如果没有处理它们，是不会通过Apple的审(我们的)查的。 887 Apple 的 例程 Reachability 中介绍了取得/检测网络状态的方法。要在应用程序程序中使用Reachability，首先要完成如下两部： 888 889 1.1. 添加源文件： 890 在你的程序中使用 Reachability 只须将该例程中的 Reachability.h 和 Reachability.m 拷贝到你的工程中。如下图： 891 892 893 894 1.2.添加framework： 895 将SystemConfiguration.framework 添加进工程。如下图： 896 897 898 2. 网络状态 899 900 Reachability.h中定义了三种网络状态： 901 typedef enum { 902 NotReachable = 0, //无连接 903 ReachableViaWiFi, //使用3G/GPRS网络 904 ReachableViaWWAN //使用WiFi网络 905 } NetworkStatus; 906 907 因此可以这样检查网络状态： 908 909 Reachability *r = [Reachability reachabilityWithHostName:@“www.apple.com”]; 910 switch ([r currentReachabilityStatus]) { 911 case NotReachable: 912 // 没有网络连接 913 break; 914 case ReachableViaWWAN: 915 // 使用3G网络 916 break; 917 case ReachableViaWiFi: 918 // 使用WiFi网络 919 break; 920 } 921 922 3.检查当前网络环境 923 程序启动时，如果想检测可用的网络环境，可以像这样 924 // 是否wifi 925 + (BOOL) IsEnableWIFI { 926 return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable); 927 } 928 929 // 是否3G 930 + (BOOL) IsEnable3G { 931 return ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable); 932 } 933 例子： 934 - (void)viewWillAppear:(BOOL)animated { 935 if (([Reachability reachabilityForInternetConnection].currentReachabilityStatus == NotReachable) && 936 ([Reachability reachabilityForLocalWiFi].currentReachabilityStatus == NotReachable)) { 937 self.navigationItem.hidesBackButton = YES; 938 [self.navigationItem setLeftBarButtonItem:nil animated:NO]; 939 } 940 } 941 942 4. 链接状态的实时通知 943 网络连接状态的实时检查，通知在网络应用中也是十分必要的。接续状态发生变化时，需要及时地通知用户： 944 945 Reachability 1.5版本 946 // My.AppDelegate.h 947 #import "Reachability.h" 948 949 @interface MyAppDelegate : NSObject <UIApplicationDelegate> { 950 NetworkStatus remoteHostStatus; 951 } 952 953 @property NetworkStatus remoteHostStatus; 954 955 @end 956 957 // My.AppDelegate.m 958 #import "MyAppDelegate.h" 959 960 @implementation MyAppDelegate 961 @synthesize remoteHostStatus; 962 963 // 更新网络状态 964 - (void)updateStatus { 965 self.remoteHostStatus = [[Reachability sharedReachability] remoteHostStatus]; 966 } 967 968 // 通知网络状态 969 - (void)reachabilityChanged:(NSNotification *)note { 970 [self updateStatus]; 971 if (self.remoteHostStatus == NotReachable) { 972 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"AppName", nil) 973 message:NSLocalizedString (@"NotReachable", nil) 974 delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil]; 975 [alert show]; 976 [alert release]; 977 } 978 } 979 980 // 程序启动器，启动网络监视 981 - (void)applicationDidFinishLaunching:(UIApplication *)application { 982 983 // 设置网络检测的站点 984 [[Reachability sharedReachability] setHostName:@"www.apple.com"]; 985 [[Reachability sharedReachability] setNetworkStatusNotificationsEnabled:YES]; 986 // 设置网络状态变化时的通知函数 987 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) 988 name:@"kNetworkReachabilityChangedNotification" object:nil]; 989 [self updateStatus]; 990 } 991 992 - (void)dealloc { 993 // 删除通知对象 994 [[NSNotificationCenter defaultCenter] removeObserver:self]; 995 [window release]; 996 [super dealloc]; 997 } 998 999 Reachability 2.0版本 1000 1001 1002 // MyAppDelegate.h 1003 @class Reachability; 1004 1005 @interface MyAppDelegate : NSObject <UIApplicationDelegate> { 1006 Reachability *hostReach; 1007 } 1008 1009 @end 1010 1011 // MyAppDelegate.m 1012 - (void)reachabilityChanged:(NSNotification *)note { 1013 Reachability* curReach = [note object]; 1014 NSParameterAssert([curReach isKindOfClass: [Reachability class]]); 1015 NetworkStatus status = [curReach currentReachabilityStatus]; 1016 1017 if (status == NotReachable) { 1018 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"AppName"" 1019 message:@"NotReachable" 1020 delegate:nil 1021 cancelButtonTitle:@"YES" otherButtonTitles:nil]; 1022 [alert show]; 1023 [alert release]; 1024 } 1025 } 1026 1027 - (void)applicationDidFinishLaunching:(UIApplication *)application { 1028 // ... 1029 1030 // 监测网络情况 1031 [[NSNotificationCenter defaultCenter] addObserver:self 1032 selector:@selector(reachabilityChanged:) 1033 name: kReachabilityChangedNotification 1034 object: nil]; 1035 hostReach = [[Reachability reachabilityWithHostName:@"www.google.com"] retain]; 1036 hostReach startNotifer]; 1037 // ... 1038 } 1039 1040 1041 二：使用NSConnection下载数据 1042 1043 1.创建NSConnection对象，设置委托对象 1044 1045 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[self urlString]]]; 1046 [NSURLConnection connectionWithRequest:request delegate:self]; 1047 1048 2. NSURLConnection delegate委托方法 1049 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response; 1050 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error; 1051 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data; 1052 - (void)connectionDidFinishLoading:(NSURLConnection *)connection; 1053 1054 3. 实现委托方法 1055 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { 1056 // store data 1057 [self.receivedData setLength:0]; //通常在这里先清空接受数据的缓存 1058 } 1059 1060 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 1061 /* appends the new data to the received data */ 1062 [self.receivedData appendData:data]; //可能多次收到数据，把新的数据添加在现有数据最后 1063 } 1064 1065 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { 1066 // 错误处理 1067 } 1068 1069 - (void)connectionDidFinishLoading:(NSURLConnection *)connection { 1070 // disconnect 1071 [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; 1072 NSString *returnString = [[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding]; 1073 NSLog(returnString); 1074 [self urlLoaded:[self urlString] data:self.receivedData]; 1075 firstTimeDownloaded = YES; 1076 } 1077 1078 三：使用NSXMLParser解析xml文件 1079 1080 1. 设置委托对象，开始解析 1081 NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data]; //或者也可以使用initWithContentsOfURL直接下载文件，但是有一个原因不这么做： 1082 // It's also possible to have NSXMLParser download the data, by passing it a URL, but this is not desirable 1083 // because it gives less control over the network, particularly in responding to connection errors. 1084 [parser setDelegate:self]; 1085 [parser parse]; 1086 1087 2. 常用的委托方法 1088 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName 1089 namespaceURI:(NSString *)namespaceURI 1090 qualifiedName:(NSString *)qName 1091 attributes:(NSDictionary *)attributeDict; 1092 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName 1093 namespaceURI:(NSString *)namespaceURI 1094 qualifiedName:(NSString *)qName; 1095 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string; 1096 - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError; 1097 1098 static NSString *feedURLString = @"http://www.yifeiyang.net/test/test.xml"; 1099 1100 3. 应用举例 1101 - (void)parseXMLFileAtURL:(NSURL *)URL parseError:(NSError **)error 1102 { 1103 NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:URL]; 1104 [parser setDelegate:self]; 1105 [parser setShouldProcessNamespaces:NO]; 1106 [parser setShouldReportNamespacePrefixes:NO]; 1107 [parser setShouldResolveExternalEntities:NO]; 1108 [parser parse]; 1109 NSError *parseError = [parser parserError]; 1110 if (parseError && error) { 1111 *error = parseError; 1112 } 1113 [parser release]; 1114 } 1115 1116 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 1117 qualifiedName:(NSString*)qName attributes:(NSDictionary *)attributeDict{ 1118 // 元素开始句柄 1119 if (qName) { 1120 elementName = qName; 1121 } 1122 if ([elementName isEqualToString:@"user"]) { 1123 // 输出属性值 1124 NSLog(@"Name is %@ , Age is %@", [attributeDict objectForKey:@"name"], [attributeDict objectForKey:@"age"]); 1125 } 1126 } 1127 1128 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 1129 qualifiedName:(NSString *)qName 1130 { 1131 // 元素终了句柄 1132 if (qName) { 1133 elementName = qName; 1134 } 1135 } 1136 1137 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string 1138 { 1139 // 取得元素的text 1140 } 1141 1142 NSError *parseError = nil; 1143 [self parseXMLFileAtURL:[NSURL URLWithString:feedURLString] parseError:&parseError]; 1144 1145 Iphone 实现画折线图 1146 1147 iphone里面要画图一般都是通过CoreGraphics.framwork和QuartzCore.framwork实现，apple的官方sdk demon中包含了QuartzCore的基本用法， 1148 1149 1150 具体demo请参考http://developer.apple.com/library/ios/#samplecode/QuartzDemo/ 1151 折线图 1152 1153 1154 要实现折线图也就把全部的点连起来，movePointLineto，具体的调用里面的api就可以实现了，但是画坐标就比较麻烦了，里面需要去转很多，好在国外有人开源了一个画折线图的开发包，首先看看效果吧，具体怎么用可以参考作者git版本库中的wiki。 1155 http://github.com/devinross/tapkulibrary/wiki/How-To-Use-This-Library 1156 1157 这个包还提供了其他的很好看的UI，都可以调来用，但是我们只需要一个画图要把整个包都导进去，工程太大了，既然是开源的那就想办法提取出来吧，原先之前也有人干过这样的事。http://duivesteyn.net/2010/03/07/iphone-sdk-implementing-the-tapku-graph-in-your-application/ 1158 我对源代码进行简单的修改，使其显示坐标之类的，更加符合工程的需要，但是还没有实现画多组数据，只能画一组数据，不用viewContol，而使用addsubview，直接添加到当前的窗口，最终效果如下。 1159 使用方法： 1160 1161 1.工程添加tk库里面的如下文件 1162 1163 2. 添加QuartzCore framework 1164 #import <QuartzCore/QuartzCore.h> 1165 添加TapkuLibrary.bundle资源文件 1166 3.代码中完成实例，数据初始化就可以用了 1167 1168 下载修改后的版本。下次有时间在整理一个工程版本出来。 1169 1170 让iPhone屏幕常亮不变暗的方法 1171 1172 如果您希望运行自己开发的App时，iPhone的屏幕不再自动变暗，可以使用以下方法让屏幕常亮： iPhone OS用一个布尔值用来控制是否取消应用程序空闲时间：@property(nonatomic, getter=isIdleTime 1173 1174 如果您希望运行自己开发的App时，iPhone的屏幕不再自动变暗，可以使用以下方法让屏幕常亮： 1175 1176 iPhone OS用一个布尔值用来控制是否取消应用程序空闲时间：@property(nonatomic, getter=isIdleTimerDisabled) BOOL idleTimerDisabled。这个值的默认属性是"NO"。当大多数应用程序没有接收到用户输入信息的时候，系统会把设备设置成“休眠”状态，iPhone屏幕也会变暗。这样做是为了保存更多电量。事实上，应用程序在运行加速度游戏的时候是不需要用户输入的，当然这里只是一个假设，把这个变量设置为"YES"，来取消系统休眠的“空闲时间”。 1177 1178 重点是：你必须当真正需要的时候才打开这个属性当你不用的时候马上还愿成"NO"。大多数应用程序在休眠时间到的时候让系统关闭屏幕。这个包括了有音频的应用程 序。在Audio Session Services中使用适当的回放和记录功能不会被间断当屏幕关闭时。只有地图应用程序，游戏或者一些不间断的用户交互程序可以取消这个属性。 1179 1180 苹果开发网络编程知识总结 1181 1182 以下苹果开发网络编程知识由 CocoaChina 会员 cocoa_yang 总结，希望能为苹果开发新手梳理知识脉络，节省入门时间。一：确认网络环境3G/WIFI 1. 添加源文件和framework 开发Web等网络应用程序 1183 1184 以下苹果开发网络编程知识由 CocoaChina 会员 “cocoa_yang” 总结，希望能为苹果开发新手梳理知识脉络，节省入门时间。 1185 1186 一：确认网络环境3G/WIFI 1187 1188 1. 添加源文件和framework 1189 1190 开发Web等网络应用程序的时候，需要确认网络环境，连接情况等信息。如果没有处理它们，是不会通过Apple的审查的。 1191 Apple 的 例程 Reachability 中介绍了取得/检测网络状态的方法。要在应用程序程序中使用Reachability，首先要完成如下两部： 1192 1193 1.1. 添加源文件： 1194 在你的程序中使用 Reachability 只须将该例程中的 Reachability.h 和 Reachability.m 拷贝到你的工程中。如下图： 1195 1196 1.2.添加framework： 1197 将SystemConfiguration.framework 添加进工程。如下图： 1198 1199 1200 2. 网络状态 1201 1202 Reachability.h中定义了三种网络状态： 1203 typedef enum { 1204 NotReachable = 0, //无连接 1205 ReachableViaWiFi, //使用3G/GPRS网络 1206 ReachableViaWWAN //使用WiFi网络 1207 } NetworkStatus; 1208 1209 因此可以这样检查网络状态： 1210 1211 Reachability *r = [Reachability reachabilityWithHostName:@“www.apple.com”]; 1212 switch ([r currentReachabilityStatus]) { 1213 case NotReachable: 1214 // 没有网络连接 1215 break; 1216 case ReachableViaWWAN: 1217 // 使用3G网络 1218 break; 1219 case ReachableViaWiFi: 1220 // 使用WiFi网络 1221 break; 1222 } 1223 1224 3.检查当前网络环境 1225 1226 程序启动时，如果想检测可用的网络环境，可以像这样 1227 // 是否wifi 1228 + (BOOL) IsEnableWIFI { 1229 return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable); 1230 } 1231 1232 // 是否3G 1233 + (BOOL) IsEnable3G { 1234 return ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable); 1235 } 1236 例子： 1237 - (void)viewWillAppear:(BOOL)animated { 1238 if (([Reachability reachabilityForInternetConnection].currentReachabilityStatus == NotReachable) && 1239 ([Reachability reachabilityForLocalWiFi].currentReachabilityStatus == NotReachable)) { 1240 self.navigationItem.hidesBackButton = YES; 1241 [self.navigationItem setLeftBarButtonItem:nil animated:NO]; 1242 } 1243 } 1244 1245 4. 链接状态的实时通知 1246 1247 网络连接状态的实时检查，通知在网络应用中也是十分必要的。接续状态发生变化时，需要及时地通知用户： 1248 1249 Reachability 1.5版本 1250 // My.AppDelegate.h 1251 #import "Reachability.h" 1252 1253 @interface MyAppDelegate : NSObject <UIApplicationDelegate> { 1254 NetworkStatus remoteHostStatus; 1255 } 1256 1257 @property NetworkStatus remoteHostStatus; 1258 1259 @end 1260 1261 // My.AppDelegate.m 1262 #import "MyAppDelegate.h" 1263 1264 @implementation MyAppDelegate 1265 @synthesize remoteHostStatus; 1266 1267 // 更新网络状态 1268 - (void)updateStatus { 1269 self.remoteHostStatus = [[Reachability sharedReachability] remoteHostStatus]; 1270 } 1271 1272 // 通知网络状态 1273 - (void)reachabilityChanged:(NSNotification *)note { 1274 [self updateStatus]; 1275 if (self.remoteHostStatus == NotReachable) { 1276 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"AppName", nil) 1277 message:NSLocalizedString (@"NotReachable", nil) 1278 delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil]; 1279 [alert show]; 1280 [alert release]; 1281 } 1282 } 1283 1284 // 程序启动器，启动网络监视 1285 - (void)applicationDidFinishLaunching:(UIApplication *)application { 1286 1287 // 设置网络检测的站点 1288 [[Reachability sharedReachability] setHostName:@"www.apple.com"]; 1289 [[Reachability sharedReachability] setNetworkStatusNotificationsEnabled:YES]; 1290 // 设置网络状态变化时的通知函数 1291 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) 1292 name:@"kNetworkReachabilityChangedNotification" object:nil]; 1293 [self updateStatus]; 1294 } 1295 1296 - (void)dealloc { 1297 // 删除通知对象 1298 [[NSNotificationCenter defaultCenter] removeObserver:self]; 1299 [window release]; 1300 [super dealloc]; 1301 } 1302 1303 Reachability 2.0版本 1304 1305 1306 // MyAppDelegate.h 1307 @class Reachability; 1308 1309 @interface MyAppDelegate : NSObject <UIApplicationDelegate> { 1310 Reachability *hostReach; 1311 } 1312 1313 @end 1314 1315 // MyAppDelegate.m 1316 - (void)reachabilityChanged:(NSNotification *)note { 1317 Reachability* curReach = [note object]; 1318 NSParameterAssert([curReach isKindOfClass: [Reachability class]]); 1319 NetworkStatus status = [curReach currentReachabilityStatus]; 1320 1321 if (status == NotReachable) { 1322 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"AppName"" 1323 message:@"NotReachable" 1324 delegate:nil 1325 cancelButtonTitle:@"YES" otherButtonTitles:nil]; 1326 [alert show]; 1327 [alert release]; 1328 } 1329 } 1330 1331 - (void)applicationDidFinishLaunching:(UIApplication *)application { 1332 // ... 1333 1334 // 监测网络情况 1335 [[NSNotificationCenter defaultCenter] addObserver:self 1336 selector:@selector(reachabilityChanged:) 1337 name: kReachabilityChangedNotification 1338 object: nil]; 1339 hostReach = [[Reachability reachabilityWithHostName:@"www.google.com"] retain]; 1340 hostReach startNotifer]; 1341 // ... 1342 } 1343 1344 1345 二：使用NSConnection下载数据 1346 1347 1.创建NSConnection对象，设置委托对象 1348 1349 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[self urlString]]]; 1350 [NSURLConnection connectionWithRequest:request delegate:self]; 1351 1352 2. NSURLConnection delegate委托方法 1353 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response; 1354 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error; 1355 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data; 1356 - (void)connectionDidFinishLoading:(NSURLConnection *)connection; 1357 1358 3. 实现委托方法 1359 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { 1360 // store data 1361 [self.receivedData setLength:0]; //通常在这里先清空接受数据的缓存 1362 } 1363 1364 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 1365 /* appends the new data to the received data */ 1366 [self.receivedData appendData:data]; //可能多次收到数据，把新的数据添加在现有数据最后 1367 } 1368 1369 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { 1370 // 错误处理 1371 } 1372 1373 - (void)connectionDidFinishLoading:(NSURLConnection *)connection { 1374 // disconnect 1375 [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; 1376 NSString *returnString = [[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding]; 1377 NSLog(returnString); 1378 [self urlLoaded:[self urlString] data:self.receivedData]; 1379 firstTimeDownloaded = YES; 1380 } 1381 1382 三：使用NSXMLParser解析xml文件 1383 1384 1. 设置委托对象，开始解析 1385 NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data]; //或者也可以使用initWithContentsOfURL直接下载文件，但是有一个原因不这么做： 1386 // It's also possible to have NSXMLParser download the data, by passing it a URL, but this is not desirable 1387 // because it gives less control over the network, particularly in responding to connection errors. 1388 [parser setDelegate:self]; 1389 [parser parse]; 1390 1391 2. 常用的委托方法 1392 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName 1393 namespaceURI:(NSString *)namespaceURI 1394 qualifiedName:(NSString *)qName 1395 attributes:(NSDictionary *)attributeDict; 1396 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName 1397 namespaceURI:(NSString *)namespaceURI 1398 qualifiedName:(NSString *)qName; 1399 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string; 1400 - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError; 1401 1402 static NSString *feedURLString = @"http://www.yifeiyang.net/test/test.xml"; 1403 1404 3. 应用举例 1405 - (void)parseXMLFileAtURL:(NSURL *)URL parseError:(NSError **)error 1406 { 1407 NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:URL]; 1408 [parser setDelegate:self]; 1409 [parser setShouldProcessNamespaces:NO]; 1410 [parser setShouldReportNamespacePrefixes:NO]; 1411 [parser setShouldResolveExternalEntities:NO]; 1412 [parser parse]; 1413 NSError *parseError = [parser parserError]; 1414 if (parseError && error) { 1415 *error = parseError; 1416 } 1417 [parser release]; 1418 } 1419 1420 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 1421 qualifiedName:(NSString*)qName attributes:(NSDictionary *)attributeDict{ 1422 // 元素开始句柄 1423 if (qName) { 1424 elementName = qName; 1425 } 1426 if ([elementName isEqualToString:@"user"]) { 1427 // 输出属性值 1428 NSLog(@"Name is %@ , Age is %@", [attributeDict objectForKey:@"name"], [attributeDict objectForKey:@"age"]); 1429 } 1430 } 1431 1432 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI 1433 qualifiedName:(NSString *)qName 1434 { 1435 // 元素终了句柄 1436 if (qName) { 1437 elementName = qName; 1438 } 1439 } 1440 1441 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string 1442 { 1443 // 取得元素的text 1444 } 1445 1446 NSError *parseError = nil; 1447 [self parseXMLFileAtURL:[NSURL URLWithString:feedURLString] parseError:&parseError]; 1448 1449 如何隐藏状态栏 1450 [ UIApplication sharedApplication ].statusBarHidden = YES; 1451 1452 .m 文件与.mm文件的区别 1453 .m文件是object-c文件 1454 .mm文件相当于c++或者c文件 1455 1456 NSLog(@"afd")与 NSLog("afd") 1457 1458 细微差别会导致程序崩溃。 1459 1460 但是我不太明白为何苹果要把编译器做的对这两种常量有区别。 1461 1462 不过值得一提的是可能为了方便苹果自身的NSObject对象的格式化输出。 1463 1464 safari其实没有把内存的缓存写到存储卡上 1465 1466 NSURLCache doesn't seem to support writing to disk on iPhone. The documentation for NSCachedURLResponse says that the NSURLCacheStoragePolicy "NSURLCacheStorageAllowed" is treated as "NSURLCacheStorageAllowedInMemoryOnly" by iPhone OS. 1467 1468 官方文档是这么说的。 1469 1470 为了证明这个，我找到了一个目录。 1471 1472 /private/var/mobile/Library/Caches/Safari/Thumbnails 1473 1474 随机数的使用 1475 1476 头文件的引用 1477 #import <time.h> 1478 #import <mach/mach_time.h> 1479 1480 srandom()的使用 1481 srandom((unsigned)(mach_absolute_time() & 0xFFFFFFFF)); 1482 1483 直接使用 random() 来调用随机数 1484 1485 在UIImageView 中旋转图像 1486 1487 float rotateAngle = M_PI; 1488 CGAffineTransform transform =CGAffineTransformMakeRotation(rotateAngle); 1489 imageView.transform = transform; 1490 1491 以上代码旋转imageView, 角度为rotateAngle, 方向可以自己测试哦！ 1492 1493 1494 在Quartz中如何设置旋转点 1495 1496 UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bg.png"]]; 1497 imageView.layer.anchorPoint = CGPointMake(0.5, 1.0); 1498 1499 这个是把旋转点设置为底部中间。记住是在QuartzCore.framework中才得到支持。 1500 1501 创建.plist文件并存储 1502 1503 NSString *errorDesc; //用来存放错误信息 1504 NSMutableDictionary *rootObj = [NSMutableDictionary dictionaryWithCapacity:4]; //NSDictionary, NSData等文件可以直接转化为plist文件 1505 NSDictionary *innerDict; 1506 NSString *name; 1507 Player *player; 1508 NSInteger saveIndex; 1509 1510 for(int i = 0; i < [playerArray count]; i++) { 1511 player = nil; 1512 player = [playerArray objectAtIndex:i]; 1513 if(player == nil) 1514 break; 1515 name = player.playerName;// This "Player1" denotes the player name could also be the computer name 1516 innerDict = [self getAllNodeInfoToDictionary:player]; 1517 [rootObj setObject:innerDict forKey:name]; // This "Player1" denotes the person who start this game 1518 } 1519 player = nil; 1520 NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:(id)rootObj format:NSPropertyListXMLFormat_v1_0 errorDescription:&errorDesc]; 1521 1522 红色部分可以忽略，只是给rootObj添加一点内容。这个plistData为创建好的plist文件，用其writeToFile方法就可以写成文件。下面是代码： 1523 1524 /*得到移动设备上的文件存放位置*/ 1525 NSString *documentsPath = [self getDocumentsDirectory]; 1526 NSString *savePath = [documentsPath stringByAppendingPathComponent:@"save.plist"]; 1527 1528 /*存文件*/ 1529 if (plistData) { 1530 [plistData writeToFile:savePath atomically:YES]; 1531 } 1532 else { 1533 NSLog(errorDesc); 1534 [errorDesc release]; 1535 } 1536 1537 - (NSString *)getDocumentsDirectory { 1538 NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 1539 return [paths objectAtIndex:0]; 1540 } 1541 1542 读取plist文件并转化为NSDictionary 1543 1544 NSString *documentsPath = [self getDocumentsDirectory]; 1545 NSString *fullPath = [documentsPath stringByAppendingPathComponent:@"save.plist"]; 1546 NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:fullPath]; 1547 1548 读取一般性文档文件 1549 1550 NSString *tmp; 1551 NSArray *lines; /*将文件转化为一行一行的*/ 1552 lines = [[NSString stringWithContentsOfFile:@"testFileReadLines.txt"] 1553 componentsSeparatedByString:@"\n"]; 1554 1555 NSEnumerator *nse = [lines objectEnumerator]; 1556 1557 // 读取<>里的内容 1558 while(tmp = [nse nextObject]) { 1559 NSString *stringBetweenBrackets = nil; 1560 NSScanner *scanner = [NSScanner scannerWithString:tmp]; 1561 [scanner scanUpToString:@"<" intoString:nil]; 1562 [scanner scanString:@"<" intoString:nil]; 1563 [scanner scanUpToString:@">" intoString:&stringBetweenBrackets]; 1564 1565 NSLog([stringBetweenBrackets description]); 1566 } 1567 1568 对于读写文件，还有补充，暂时到此。随机数和文件读写在游戏开发中经常用到。所以把部分内容放在这，以便和大家分享，也当记录，便于查找。 1569 1570 隐藏NavigationBar 1571 [self.navigationController setNavigationBarHidden:YES animated:YES]; 1572 1573 在想隐藏的ViewController中使用就可以了。 1574 1575 如何在iPhone程序中调用外部命令 1576 1577 下面是如何在iPhone非官方SDK程序中调用外部命令的方法。 1578 1579 - ( NSString * ) executeCommand : ( NSString * ) cmd { NSString * output = [ NSString string ] ; FILE * pipe = popen ( [ cmd cStringUsingEncoding : NSASCIIStringEnc 1580 1581 下面是如何在iPhone非官方SDK程序中调用外部命令的方法。 1582 1583 - (NSString *)executeCommand: (NSString *)cmd 1584 { 1585 NSString *output = [NSString string]; 1586 FILE *pipe = popen([cmd cStringUsingEncoding: NSASCIIStringEncoding], "r"); 1587 if (!pipe) return; 1588 1589 char buf[1024]; 1590 while(fgets(buf, 1024, pipe)) { 1591 output = [output stringByAppendingFormat: @"%s", buf]; 1592 } 1593 1594 pclose(pipe); 1595 return output; 1596 } 1597 1598 NSString *yourcmd = [NSString stringWithFormat: @"your command"]; 1599 [self executeCommand: yourcmd]; 1600 1601 如何在iPhone程序读取数据时显示进度窗 1602 1603 下面代码说明如何使用iPhone 非官方SDK在读取数据时显示进度条。 1604 1605 以下代码参考了MobileRss。 1606 1607 定义头文件： 1608 1609 #import "uikit/UIProgressHUD.h" 1610 1611 @interface EyeCandy : UIApplication { 1612 UIProgressHUD *progress; 1613 } 1614 1615 - (void) showProgressHUD:(NSString *)label withWindow:(UIWindow *)w withView:(UIView *)v withRect:(struct CGRect)rect; 1616 - (void) hideProgressHUD; 1617 1618 .@end 1619 1620 上面的引号要改成<>。 1621 1622 import "EyeCandy.h" 1623 1624 @implementation EyeCandy 1625 - (void)showProgressHUD:(NSString *)label withWindow:(UIWindow *)w withView:(UIView *)v withRect:(struct CGRect)rect 1626 { 1627 progress = [[UIProgressHUD alloc] initWithWindow: w]; 1628 [progress setText: label]; 1629 [progress drawRect: rect]; 1630 [progress show: YES]; 1631 1632 [v addSubview:progress]; 1633 } 1634 1635 - (void)hideProgressHUD 1636 { 1637 [progress show: NO]; 1638 [progress removeFromSuperview]; 1639 } 1640 1641 @end 1642 1643 使用下面代码调用： 1644 1645 // Setup Eye Candy View 1646 _eyeCandy = [[[EyeCandy alloc] init] retain]; 1647 1648 // Call loading display 1649 [_eyeCandy showProgressHUD:@"Loading …" withWindow:window withView:mainView withRect:CGRectMake(0.0f, 100.0f, 320.0f, 50.0f)]; 1650 1651 // When finished for hiding the "loading text" 1652 [_eyeCandy hideProgressHUD]; 1653 1654 WebKit的基本用法 1655 1656 WebKit是苹果开发中比较常用的浏览器引擎，Safari使用的正是WebKit引擎。WebKit基于KDE的KHTML加以再开发，解析速度超过了以往所有的浏览器。这里简单记录一下WebKit的基本用法。 1657 1658 WebKit由下面的结构组成： 1659 1660
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