BarButtonItem 不显示
我创建了一个新的基于窗口的应用程序，以及一个子类 UIViewController 的 RootViewController。我在 AppDelegate 中创建了一个 UINavigationController，当我将 UINavigationController 的视图添加到窗口时，我确实看到了顶部的导航栏。但是，我似乎无法向导航栏添加按钮 - 没有编译错误，但按钮（和标题）没有显示。代码如下：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
RootViewController * rootViewController = [[RootViewController alloc] initWithNibName:@"RootViewController" bundle:nil];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
UIBarButtonItem *next = [[UIBarButtonItem alloc] initWithTitle:@"Next" style:UIBarButtonItemStyleDone target:nil action:nil];
navigationController.title = @"Foo";
navigationController.navigationItem.rightBarButtonItem = next;
[self.window addSubview:navigationController.view];
// Override point for customization after application launch.
[self.window makeKeyAndVisible];
return YES;
}
我做错了什么？
I created a new window based application, and a RootViewController that sublcasses UIViewController. I created a UINavigationController in the AppDelegate and when I add the UINavigationController's view to the window, I do see the navigation bar on top. However, I cannot seem to add a button to the navigation bar - there are no compile errors, but the button (and the title) does not show up. The code is below:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
RootViewController * rootViewController = [[RootViewController alloc] initWithNibName:@"RootViewController" bundle:nil];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:rootViewController];
UIBarButtonItem *next = [[UIBarButtonItem alloc] initWithTitle:@"Next" style:UIBarButtonItemStyleDone target:nil action:nil];
navigationController.title = @"Foo";
navigationController.navigationItem.rightBarButtonItem = next;
[self.window addSubview:navigationController.view];
// Override point for customization after application launch.
[self.window makeKeyAndVisible];
return YES;
}
What am I doing wrong?
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将此：更改
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可能 style:UIBarButtonItemStyleDone 仅在编辑模式下使用为 YES。如果在根控制器或子视图控制器中，您可以尝试调用 self.editing = YES，但在 AppDelegate 中则不能。
May be style:UIBarButtonItemStyleDone only used in editing mode is YES. If in Root controller or sub view controller, you may try call self.editing = YES, but in AppDelegate you can't.