如何正确设置 UINavigationController 并将视图添加到堆栈

Question

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

self. window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
UINavigationController *navVC = [UINavigationController new];
UIStoryboard *mStoryboard = [UIStoryboard storyboardWithName:@"your storyboard name" bundle:nil];

ViewController *VC1 = [mStoryboard instantiateViewControllerWithIdentifier:@"VC"];


[navVC setViewControllers:[NSArray arrayWithObject:VC1] animated:NO];
[self. window setRootViewController:navVC];

[self. window makeKeyAndVisible];

return YES;
  }

现在这会创建一个导航控制器，但是当我尝试显示 secondViewController 时，它会为我显示该视图的正确导航栏，但我看到的是黑色背景而不是实际视图。将 secondViewController 添加为子视图是可行的，但是当我现在尝试显示第三个时，它会再次向我显示正确的导航栏，并为该视图设置标题，但我仍然看到 secondViewController 的视图。现在我的问题是如何将 viewController 添加到 navigationController 以便正确显示它们？我什至必须添加它们吗？我已经阅读了苹果类参考，但没有任何代码。

Answer 1

试试这个：

self. window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];
UIStoryboard *mStoryboard = [UIStoryboard storyboardWithName:@"your storyboard name" bundle:nil];
ViewController *VC1 = [mStoryboard instantiateViewControllerWithIdentifier:@"VC"];
UINavigationController *navVC = [[UINavigationController alloc] initWithRootViewController:VC1];
[self. window setRootViewController:navVC];
[self. window makeKeyAndVisible];
return YES;

现在在 VC1 中将下一个视图控制器推送到您的堆栈中

// EDIT:
UIStoryboard *mStoryboard = [UIStoryboard storyboardWithName:@"your storyboard name" bundle:nil];
ViewController *vC2 = [mStoryboard instantiateViewControllerWithIdentifier:@"VC2"];
[self.navigationController pushViewController:vC2 animated:YES];