Iphone [Tab Bar实现多view切换,Picker,DataPicter实现

用Tab Bar Controller处理IPhone多个view切换，

而且还附有创建空项目,picker和DataPicker的实现！

具体步骤：

1.创建一个空项目，选择User Interface->View,命名为rootView。

2.然后在控件面板中拖一个Tab Bar Controller的控件，可以往里面添加Tab Button,将Tab Bar Controller的File's Owner改成AppDelegate，可以将其每一个Item View的Class属性改成对应的ViewController

3.在Appdelegate.m中设置根view

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {     self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];     //通过目录导入xib文件中所有的内容     NSArray *arr = [[NSBundle mainBundle] loadNibNamed:@"rootView" owner:self options:nil];     NSLog(@"%@",arr);     self.window.rootViewController = self.rootView;     self.window.backgroundColor = [UIColor whiteColor];     [self.window makeKeyAndVisible];     return YES; }

dateViewController.h:

#import <UIKit/UIKit.h>  @interface dataViewController : UIViewController @property (retain, nonatomic) IBOutlet UIDatePicker *datePicker; - (IBAction)click:(id)sender; @property (retain, nonatomic) IBOutlet UILabel *lblShow; @end

#import "dataViewController.h"  @interface dataViewController ()  @end  @implementation dataViewController  - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];     if (self) {         // Custom initialization     }     return self; }  - (void)viewDidLoad {     [super viewDidLoad];     //self.datePicker.date = [NSData date];     [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(changeDate) userInfo:nil repeats:YES]; }  -(void)changeDate {     self.datePicker.date = [NSDate date]; }  - (void)didReceiveMemoryWarning {     [super didReceiveMemoryWarning];     // Dispose of any resources that can be recreated. }  - (void)dealloc {     [_datePicker release];     [_lblShow release];     [super dealloc]; } - (IBAction)click:(id)sender {     NSData *date = self.datePicker.date;     NSDateFormatter *formater=[[[NSDateFormatter alloc] init] autorelease];     //设置日期格式     formater.dateFormat = @"yyyy-MM-dd HH:mm:ss";//HH代表24时制,hh代表12时制     NSString *str  = [formater stringFromDate:date];     //设置时区     formater.locale = [[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"] autorelease];     date = [formater dateFromString:@"2013-08-15 14:03:00"];     NSLog(@"字符串转化成日期是:%@",date);     NSLog(@"%@",str);     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"当前时间" message:str delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];     [alert show];     self.lblShow.text = str;      } @end

viewController.h:

#import <UIKit/UIKit.h>

//注意：在使用pickerView的时候要将控件拖向File's Owner，将DataSourse和Delegate指向File's Owner，并且要实现他的两个协议

@interface SecondViewController :UIViewController<UIPickerViewDataSource,UIPickerViewDelegate>

@property (retain,nonatomic)IBOutletUIPickerView *picker;

- (IBAction)click:(id)sender;

@property(nonatomic,retain)NSArray *array;

@end

#import "SecondViewController.h"  @interface SecondViewController ()  @end  @implementation SecondViewController  - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];     if (self) {         // Custom initialization     }     return self; }  - (void)viewDidLoad {     [super viewDidLoad];     NSArray *arr = [NSArray arrayWithObjects:@"shanghai",@"nanjign",@"tianjin",@"nantong",@"beijing",nil];     self.array = arr; }  - (void)didReceiveMemoryWarning {     [super didReceiveMemoryWarning];     // Dispose of any resources that can be recreated. }  - (void)dealloc {     [_picker release];     [super dealloc]; }  #pragma mark datasourse //每个组件有多少行数据 -(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {     return [self.array count]; } //PickerView有几个组件 -(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {     return 1; }  #pragma mark delegate //每个组件中的每行显示什么数据 -(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {     return [self.array objectAtIndex:row]; }    - (IBAction)click:(id)sender {     int row = [self.picker selectedRowInComponent:0];//获得第几个组件中被选中的行数     NSString *str = [self.array objectAtIndex:row];//通过第几行，在数据中获得被选中的字符串          UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:@"title" message:str delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease];     [alert show]; } @end

效果图：

如果有两个Component的话：

viewController.h:

#import <UIKit/UIKit.h>  @interface FirstViewController : UIViewController<UIPickerViewDataSource,UIPickerViewDelegate> @property (retain, nonatomic) IBOutlet UIPickerView *picker; @property(nonatomic,retain)NSArray *array; @property(nonatomic,retain)NSArray *array2; - (IBAction)click:(id)sender; @end

#import "FirstViewController.h" #define component_0 0 #define other_component 1 @interface FirstViewController ()  @end  @implementation FirstViewController  - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];     if (self) {         // Custom initialization     }     return self; }  - (void)viewDidLoad {     [super viewDidLoad];     NSArray *array = [NSArray arrayWithObjects:@"上海",@"北京",@"天津",@"成都",@"台湾",@"香港",@"江苏",@"武汉",@"黑龙江",@"浙江", nil];     self.array = array;          array = @[@"路飞",@"乔巴",@"香吉士",@"索隆",@"娜美",@"罗宾",@"乌索普",@"弗兰奇",@"骷髅头"];     self.array2 = array;     //用来设置默认选项     [self.picker selectRow:2 inComponent:component_0 animated:YES];        [self.picker selectRow:3 inComponent:other_component animated:YES];  }  //每个组件有几行数据 -(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {     //创建数据     if(component == component_0)     {         return [self.array count];   //动态获取数字     }else{         return [self.array2 count];     } }  #pragma mark delegate //每个组件的每行显示什么数据 -(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {     if(component == component_0)     {         return [self.array objectAtIndex:row];     }else{         return [self.array2 objectAtIndex:row];     }      }   -(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {     return 2; } //当你对一个pickerView进行了一次操作之后都会被调用 -(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {     NSString *str = nil;     if(component == component_0)     {         str = [self.array objectAtIndex:row];     }     else     {         str = [self.array2 objectAtIndex:row];     }     NSLog(@"%@",str); }  - (void)dealloc {     [_picker release];     [_array release];     [_array2 release];     [super dealloc]; } - (IBAction)click:(id)sender {     int row = [self.picker selectedRowInComponent:component_0];   //第几个组件中被选中的行数     NSString * str = [self.array objectAtIndex:row];   //通过第几行，在数据中获得被选中的字符串     row = [self.picker selectedRowInComponent:other_component];     NSString *str1 = [self.array2 objectAtIndex:row];          NSString *str3 = [NSString stringWithFormat:@"%@ %@",str,str1];          UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Title" message:str3 delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];     [alert show]; } @end