此TabBar结合了picker View

 

在代理类中加

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    UIViewController *datePickerView = [[[DatePickerViewController alloc] initWithNibName:@"DatePickerViewController" bundle:nil] autorelease];
    
    UIViewController *singleComponentPickerView = [[[SingleComponentPickerViewController alloc] initWithNibName:@"SingleComponentPickerViewController" bundle:nil] autorelease];
    
    UIViewController *doubleComponent = [[[DoubleComponentPickerViewController alloc]initWithNibName:@"DoubleComponentPickerViewController" bundle:nil] autorelease];
    
    UIViewController *dependentComponent = [[[DependentComponentPickerViewController alloc]initWithNibName:@"DependentComponentPickerViewController" bundle:nil] autorelease];
    
    UIViewController *customPicker = [[[CustomPickerViewController alloc]initWithNibName:@"CustomPickerViewController" bundle:nil] autorelease];

    
    
    

    self.tabBarController = [[[UITabBarController alloc] init] autorelease];
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:datePickerView, singleComponentPickerView , doubleComponent, dependentComponent, customPicker, nil];
    
    self.window.rootViewController = self.tabBarController;
    [self.window makeKeyAndVisible];
    return YES;
}