タブバーごとに個別のUINavigationControllerを使用する必要があります

Question

Appleによれば、UINavigationControllerとUITabBarControllerをコードを使用して組み合わせることができます。この設定で

MyViewController1* vc1 = [[MyViewController1 alloc] init]; 
MyViewController2* vc2 = [[MyViewController2 alloc] init]; 
MyViewController3* vc3 = [[MyViewController3 alloc] init]; 

MyNavRootViewController* vc4 = [[MyNavRootViewController alloc] init]; 
UINavigationController* navController = [[UINavigationController alloc] 
         initWithRootViewController:vc4]; 

NSArray* controllers = [NSArray arrayWithObjects:vc1, vc2, vc3, navController, nil]; 
tabBarController.viewControllers = controllers; 

、唯一VC4はUINavigationControllerを持っていますが、私は、VC1~VC3をしたい場合もUINavigationControllerを持って何？、私のような行う必要があります。..

MyViewController1* vc1 = [[MyViewController1 alloc] init]; 
UINavigationController* nv1 = [[UINavigationController alloc] 
         initWithRootViewController:vc1]; 

MyViewController1* vc2 = [[MyViewController2 alloc] init]; 
UINavigationController* nv2= [[UINavigationController alloc] 
         initWithRootViewController:vc2]; 

MyViewController1* vc3 = [[MyViewController3 alloc] init]; 
UINavigationController* nv3 = [[UINavigationController alloc] 
         initWithRootViewController:vc3]; 


NSArray* controllers = [NSArray arrayWithObjects:nv1, nv2, nv3, nil]; 
tabBarController.viewControllers = controllers; 

はこれです正しいアプローチ？

Answer 1

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease]; 


// Override point for customization after application launch. 

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

self.tabBarController.viewControllers = [self initializeTabBarItems]; 
self.navigationController = [[UINavigationController alloc]init]; 
[self.navigationController setNavigationBarHidden:YES]; 
self.window.rootViewController = self.navigationController; 
[self.navigationController pushViewController:_tabBarController animated:YES]; 
[self.window makeKeyAndVisible]; 
return YES; 
} 
- (NSArray *)initializeTabBarItems 
{ 
NSArray * retval; 

/* Initialize view controllers */ 
UIViewController *viewController1 = [[[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil] autorelease]; 
UIViewController *viewController2 = [[[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil] autorelease]; 
UIViewController *viewController3 = [[[ThirdViewController alloc]initWithNibName:@"ThirdViewController" bundle:nil]autorelease]; 
UIViewController *viewController4 = [[[FourthViewController alloc] initWithNibName:@"FourthViewController" bundle:nil] autorelease]; 
UIViewController *viewController5 = [[[FivfthViewController alloc] initWithNibName:@"FivfthViewController" bundle:nil] autorelease]; 


/* Initialize navigation controllers */ 
UINavigationController * navigationController1 = [[UINavigationController alloc] initWithRootViewController:viewController1]; 
UINavigationController * navigationController2 = [[UINavigationController alloc] initWithRootViewController:viewController2]; 
UINavigationController * navigationController3 = [[UINavigationController alloc] initWithRootViewController:viewController3]; 
UINavigationController * navigationController4 = [[UINavigationController alloc] initWithRootViewController:viewController4]; 
UINavigationController * navigationController5 = [[UINavigationController alloc] initWithRootViewController:viewController5]; 

/* Release View Controllers */ 
[viewController1 release]; 
[viewController2 release]; 
[viewController3 release]; 
[viewController4 release]; 
[viewController5 release]; 

/* Stuff Navigation Controllers into return value */ 
retval = [NSArray arrayWithObjects:viewController1,viewController2,viewController3,viewController4,viewController5,nil]; 

/* Release Navigation Controllers */ 
[navigationController1 release]; 
[navigationController2 release]; 
[navigationController3 release]; 
[navigationController4 release]; 
[navigationController5 release]; 

return (retval); 
} 

あなたはこれを試すことができます....

Answer 2

あなたTabBarControllerのタブごとにUINavigationControllerを持っている必要があります。したがって、2番目のアプローチは正しいです。私はあなたがすべてのタブのために同じナビゲーションコントローラを再利用できるとは思わない。

Answer 3

はい、あなたのアプローチは正しいです。

ビューをタブに移動する必要がある場合、そのタブにはナビゲーションコントローラが必要です。

UINavigationController * navigationCtrl = [[UINavigationController alloc] initWithRootViewController:firstTabViewCtrl]; 
[arrTabs addObject:navigationCtrl]; 

ナビゲーション内のタブはコントローラの必要はありません。

[arrTabs addObject:firstTabViewCtrl]; 

Answer 4

はいHoward、あなたのアプローチは問題ありません。 Appleもこれを示しています。私はまたUITabbarControllerとUINavigationControllerと一緒に働いている間も同じアプローチに従います。