iOS首次启动程序引导图
第一次运行一个程序时候，我们会看到新手引导页，就是程序引导图，除非后来版本升级，或者卸载软件后重装才会再次看到引导页
我们先来看效果：
Untit.gif
这里我第一次运行程序时候，直接是有引导图的，后来两次运行都没有再次出现引导图。除非下次版本更新之后，或者卸载再次运行程序才会出现引导图。
先给大家两张图片分析一下
Snip20160911_3.png
Snip20160911_2.png
现在来教一下大家如何用代码实现引导图
第一步：在AppDelegate.m文件中
Snip20160910_1.png
代码呈上
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // 1.创建窗口 self.window = [[UIWindow alloc] init]; self.window.frame = [UIScreen mainScreen].bounds; // 2.设置根控制器 NSString *key = @"CFBundleVersion"; // 上一次的使用版本（存储在沙盒中的版本号） NSString *lastVersion = [[NSUserDefaults standardUserDefaults] objectForKey:key]; // 当前软件的版本号（从Info.plist中获得） NSString *currentVersion = [NSBundle mainBundle].infoDictionary[key]; if ([currentVersion isEqualToString:lastVersion]) { // 版本号相同：这次打开和上次打开的是同一个版本 self.window.rootViewController = [[LYWTabBarViewController alloc] init]; } else { // 这次打开的版本和上一次不一样，显示新特性 self.window.rootViewController = [[LYWNewfeatureViewController alloc] init]; // 将当前的版本号存进沙盒 [[NSUserDefaults standardUserDefaults] setObject:currentVersion forKey:key]; [[NSUserDefaults standardUserDefaults] synchronize]; } // 3.显示窗口 [self.window makeKeyAndVisible]; return YES; }
第二步：在LYWNewfeatureViewController.m 中实现简单的轮播图效果
#import "LYWNewfeatureViewController.h" #import "LYWTabBarViewController.h" #define NewfeatureCount 3 @interface LYWNewfeatureViewController ()<UIScrollViewDelegate> @property (nonatomic,weak) UIPageControl *pageControl; @end @implementation LYWNewfeatureViewController - (void)viewDidLoad { [super viewDidLoad]; [self setupScrollView]; } //创建UIScrollView并添加图片 - (void)setupScrollView { UIScrollView *scrollView = [[UIScrollView alloc] init]; scrollView.frame = [UIScreen mainScreen].bounds; [self.view addSubview:scrollView]; scrollView.bounces = NO; scrollView.pagingEnabled = YES; scrollView.showsVerticalScrollIndicator = NO; scrollView.showsHorizontalScrollIndicator = NO; scrollView.contentSize = CGSizeMake(3*kScreenWidth, 0); scrollView.delegate = self; for (NSInteger i = 0; i < NewfeatureCount; i++) { UIImageView *imageView = [[UIImageView alloc] init]; imageView.x = i * kScreenWidth; imageView.y = 0; imageView.width = kScreenWidth; imageView.height = kScreenHeight; NSString *name = [NSString stringWithFormat:@"f%ld-5",i+1]; imageView.image = [UIImage imageNamed:name]; [scrollView addSubview:imageView]; if (i == NewfeatureCount - 1) { [self setupStartBtn:imageView]; } } // 4.添加pageControl：分页，展示目前看的是第几页 UIPageControl *pageControl = [[UIPageControl alloc] init]; pageControl.numberOfPages = NewfeatureCount; pageControl.backgroundColor = [UIColor redColor]; pageControl.currentPageIndicatorTintColor = [UIColor whiteColor]; pageControl.pageIndicatorTintColor = KRGB(189, 189, 189); pageControl.centerX = kScreenWidth * 0.5; pageControl.centerY = kScreenHeight - 50; [self.view addSubview:pageControl]; self.pageControl = pageControl; } //左上角的灰色跳过按钮 -(void)createSkipBt { UIButton *skipBt = [UIButton buttonWithType:UIButtonTypeCustom]; skipBt.frame = CGRectMake(kScreenWidth - 90, 40, 80, 30); skipBt.backgroundColor = [UIColor colorWithRed:0.3 green:0.3f blue:0.3f alpha:0.3]; [skipBt setTitle:@"跳过" forState:UIControlStateNormal]; [skipBt setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; skipBt.layer.cornerRadius = 10; skipBt.clipsToBounds = YES; skipBt.tag = 10; [skipBt addTarget:self action:@selector(BtnDidClicked) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:skipBt]; } //手动拖拽结束时候调用 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { double page = scrollView.contentOffset.x / scrollView.width; // 四舍五入计算出页码 self.pageControl.currentPage = (int)(page + 0.5); // 1.3四舍五入 1.3 + 0.5 = 1.8 强转为整数(int)1.8= 1 // 1.5四舍五入 1.5 + 0.5 = 2.0 强转为整数(int)2.0= 2 // 1.6四舍五入 1.6 + 0.5 = 2.1 强转为整数(int)2.1= 2 // 0.7四舍五入 0.7 + 0.5 = 1.2 强转为整数(int)1.2= 1 } //给最后一张图片添加 进入问医生按钮 - (void)setupStartBtn:(UIImageView *)imgView { imgView.userInteractionEnabled = YES; UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom]; [btn setBackgroundImage:[UIImage imageNamed:@"cancel_ask"] forState:UIControlStateNormal]; btn.size = btn.currentBackgroundImage.size; btn.centerX = imgView.width * 0.5; btn.centerY = imgView.height * 0.75; [btn setTitle:@"进入问医生" forState:UIControlStateNormal]; [btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; [btn addTarget:self action:@selector(BtnDidClicked) forControlEvents:UIControlEventTouchUpInside]; [imgView addSubview:btn]; } //进入问医生按钮点击事件 -(void)BtnDidClicked { UIWindow *window = [UIApplication sharedApplication].keyWindow; window.rootViewController = [[LYWTabBarViewController alloc] init]; } @end
这样就👌了，其实很简单，不过是最近一个外包项目过来，然后我接手了，给它做一了一个启动引导图，闲来没事，就写写这片文章打法自己无聊的时间，也方便很多初学者学习
