iphone - 将 RootviewController 更改为导航控制器

Question

我是 iPhone 新手，

我想将我的课程更改Rootviewcontroller为我的新课程并使其成为导航控制器。

这是我的代码片段，

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


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

    [self.window makeKeyAndVisible];


    return YES;
}

我SIGABRT说'adding a root view controller <NewClass: 0x6a8dd50> as a child of view controller:

Answer 1

每当你想设置：

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];

编辑：直接用于AppDelegate instance设置rootViewController，UIWindow如上所示。

Answer 2

代替：

[self.window addSubview:navigationController.view];

制作：navigationController_ rootViewController_window

 self.window.rootViewController = navigationController;

另外，是detailViewController类型UINavigationController吗？您不能将其设置UINavigationController为另一个UINavigationController对象的根。

Answer 3

只需添加这一行，

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

在 UINavigationController 的初始化之前，

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

将您的 RootViewController 更改为 NavigationController..

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