RootViewController到TabBarViewController

Question

在Xcode4.5中，如何使用与不同选项卡视图链接的根视图控制器上的多个按钮？

我在主屏幕上有4个按钮，我想当我点击一个button1时，它应该转到tab1，类似地，当我点击button2时，tab2应该是打开的。

我该怎么办？

伪代码忽略这一点。

{
   tabBarController.viewControllers = controllers;
    window.rootViewController = tabBarController;

}

Answer 1

只需创建4个viewControllers并在应用委托方法中附加以下代码

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    UIViewController *viewController1 = [[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil] autorelease];
    UIViewController *viewController2 = [[[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil] autorelease];
    UIViewController *viewController3 = [[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil] autorelease];
    UIViewController *viewController4 = [[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil] autorelease];
    self.tabBarController = [[[UITabBarController alloc] init] autorelease];
    self.tabBarController.viewControllers = @[viewController1, viewController2,viewController3,viewController4];
    self.window.rootViewController = self.tabBarController;

Answer 2

你可以像贝洛那样做..

首先在AppDelegate类中创建UITabBarController对象，然后在applicationDidFinishLaunching:方法中分配对象，如下所示。

self.tabBarController = [[[UITabBarController alloc] init] autorelease];
self.tabBarController2 = [[[UITabBarController alloc]init]autorelease];
self.tabBarController3 = [[[UITabBarController alloc]init]autorelease];

在创建方法将不同的选项卡设置为类似于下面的RootViewController ...

-(void)setRootViewControllerTab1{

    UIViewController *viewController1, *viewController2;
    UINavigationController *navviewController1 , *navviewController2,;

    viewController1 = [[[HomeViewController alloc] initWithNibName:@"viewController1" bundle:nil] autorelease];
    navviewController1=[[UINavigationController alloc]initWithRootViewController:viewController1];
    navviewController1.title = @"Title1";


    viewController2 = [[[HowItWorksViewController alloc] initWithNibName:@"viewController2" bundle:nil] autorelease];
    navviewController2=[[UINavigationController alloc]initWithRootViewController:viewController2];
    navviewController2.title = @"Title2";
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:navviewController1, navviewController2, nil];

    self.window.rootViewController = self.tabBarController;

    [self.window makeKeyAndVisible];
}
-(void)setRootViewControllerTab2{

    UIViewController *viewController3, *viewController4;
    UINavigationController *navviewController3 , *navviewController4;
    /////TAB 2/////***********
    viewController3 = [[[CUHomeViewController alloc] initWithNibName:@"viewController3" bundle:nil] autorelease];
    navviewController3=[[UINavigationController alloc]initWithRootViewController:viewController3];
    navviewController3.title = @"Title3";

    viewController4 = [[[CUFavouritiesViewController alloc] initWithNibName:@"viewController4" bundle:nil] autorelease];
    navviewController4=[[UINavigationController alloc]initWithRootViewController:viewController4];
    navviewController4.title = @"Title4";
    self.tabBarController2.viewControllers = [NSArray arrayWithObjects:navviewController3, navviewController4, nil];

    self.window.rootViewController = self.tabBarController2;

    [self.window makeKeyAndVisible];
}

像下面这样用AppDelegate对象调用上面的方法...

例如： button1在当时的方法中点击了写这段代码...

- (IBAction)btn1_Clicked:(id)sender{
        AppDelegate *objApp = (AppDelegate *)[[UIApplication sharedApplication] delegate];
        [objApp setRootViewControllerTab1];
}

Answer 3

    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{
 UIViewController *viewController1 = [[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil] autorelease]; 
    UIViewController *viewController2 = [[[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil] autorelease]; 
    UIViewController *viewController3 = [[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil] autorelease]; 
    UIViewController *viewController4 = [[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil] autorelease]; 
    self.tabBarController = [[[UITabBarController alloc] init] autorelease]; self.tabBarController.viewControllers = @[viewController1, viewController2,viewController3,viewController4]; 
    self.window.rootViewController = self.tabBarController;
}

创建一个tabbar控制器，如下所示

像下面这样用AppDelegate对象调用上面的方法...

例如: button1在当时的方法中单击了编写此代码...

- (IBAction)btn1_Clicked:(id)sender{
    AppDelegate *objApp = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    objApp.tabbarcontroller.selectedindex = 2;
}

您可以更改selectedIndex