如何初始化一個帶有標籤欄的視圖控制器？

Question

我不知道如何初始化包含標籤欄的視圖控制器，並且標籤欄中有2個視圖控制器？

我有一個current_view_controller，一個OrderPanel，一個firstViewController和一個SecondViewController。

firstViewController和SecondViewController是OrderPanel中的選項卡。我如何正確初始化並在current_view_controller中調用OrderPanel？

這是建立Tab鍵切換到視圖控制器

#import "OrderPanel.h" 

    #import "OrderPanelFirstViewController.h" 

    #import "OrderPanelSecondViewController.h" 

    @implementation OrderPanel 

    @synthesize window = _window; 
    @synthesize tabBarController = _tabBarController; 

    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:   (NSDictionary *)launchOptions 
    { 
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
// Override point for customization after application launch. 
UIViewController *viewController1, *viewController2; 
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) { 
    viewController1 = [[OrderPanelFirstViewController alloc]  initWithNibName:@"OrderPanelFirstViewController_iPhone" bundle:nil]; 
    viewController2 = [[OrderPanelSecondViewController alloc]  initWithNibName:@"OrderPanelSecondViewController_iPhone" bundle:nil]; 
} else { 
    viewController1 = [[OrderPanelFirstViewController alloc] initWithNibName:@"OrderPanelFirstViewController_iPad" bundle:nil]; 
    viewController2 = [[OrderPanelSecondViewController alloc] initWithNibName:@"OrderPanelSecondViewController_iPad" bundle:nil]; 
} 
self.tabBarController = [[UITabBarController alloc] init]; 
self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2, nil]; 
self.window.rootViewController = self.tabBarController; 
[self.window makeKeyAndVisible]; 
return YES; 
} 

那麼，如何調用orderPanel在我當前視圖控制器類OrderPanel？

- (IBAction)T1pressed:(id)sender { 
     // how do i call order panel? 

} 

Answer 1

試試這個：

self.tabBarController = [[UITabBarController alloc] init]; 

UIViewController *viewController1 = [[firstViewController alloc] initWithNibName:@"SecondViewController" bundle:nil]; 
UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil]; 

tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1 ,viewController2, nil]; 

[self.view addSubview:tabBarController.view];