變化RootViewController的到導航控制器

Question

我新的iPhone，

我想改變我的Rootviewcontroller我的新類，並使其導航控制器。

這裏是我的代碼片段，

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


    UINavigationController *navigationController=[[UINavigationController alloc] initWithRootViewController:detailViewController]; 
    [self.window addSubview:navigationController.view]; 

    [self.window makeKeyAndVisible]; 


    return YES; 
} 

我得到SIGABRT說：'adding a root view controller <NewClass: 0x6a8dd50> as a child of view controller:

Answer 1

每當ü要設置：

DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil]; 
UINavigationController *navigationController=[[UINavigationController alloc] initWithRootViewController:detailViewController]; 
self.window.rootViewController =nil; 
self.window.rootViewController = navigationController; 
[self.window makeKeyAndVisible]; 

編輯：直接使用AppDelegateinstance設置rootViewController爲UIWindow如我上面顯示。

Answer 2

相反的：

[self.window addSubview:navigationController.view]; 

使navigationController的rootViewControllerwindow的：

self.window.rootViewController = navigationController; 

另外，是detailViewController類型UINavigationController？您不能將UINavigationController作爲根設置爲另一個UINavigationController對象。

Answer 3

只需添加這條線，

RootViewController *defaultViewController=[[RootViewController alloc]initWithNibName:@"NAME_OF_XIB" bundle:nil];

之前的UINavigationController的初始化，

RootViewController *defaultViewController=[[RootViewController alloc]initWithNibName:@"NAME_OF_XIB" bundle:nil]; 
UINavigationController *navigationController=[[UINavigationController alloc] initWithRootViewController:detailViewController]; 
[self.window addSubview:navigationController.view]; 

[self.window makeKeyAndVisible]; 
return YES; 

Answer 4

更改RootViewController的到NavigationController ..

UINavigationController *navigationController=[[UINavigationController alloc] initWithRootViewController:self.detailViewController];