ios - '试图弹出一个不存在的 View Controller

Question

我知道很多用户都问过这个问题，但我没有找到适合我的问题的解决方案。

我正在使用 splitViewController，我隐藏了我的 rootViewController 并且在 detailViewController 中我正在推送和弹出不同的 ViewControllers 。

当我从 ViewController-1 导航到 ViewController-2 时一切正常，当我返回到 ViewController-1 从 viewController-2 使用 [self.navigationController popViewControllerAnimated:NO ]; 再次正常工作。

现在，当我从 ViewController-2 导航到 ViewController-3 并返回到 ViewController-2 时，它工作正常。

但是现在，当我从 ViewController-2 返回到 ViewController-1 时，它会崩溃并出现以下错误。

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Tried to pop to a view controller that doesn't exist

我启用了僵尸对象。 image

我的应用代码如下:1.AppDelegate

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

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.splitViewController =[[UISplitViewController alloc]init];

    // create master and detailViewController for splitView
    self.rootViewController=[[RootViewController alloc]init];
    self.detailViewController=[[LoginViewController alloc]initWithNibName:@"LoginViewController" bundle:nil] ;

    //create navigation controller for root and detailViewController
    self.rootNav=[[UINavigationController alloc]initWithRootViewController:rootViewController];
    self.detailNav=[[UINavigationController alloc]initWithRootViewController:detailViewController];

    //make hide navigation bar
    self.rootNav.navigationBarHidden = YES;
    self.detailNav.navigationBarHidden = YES;

    //set splitViewController with root and detail viewController
    self.splitViewController.viewControllers=[NSArray arrayWithObjects:self.rootNav,self.detailNav,nil];
    self.splitViewController.delegate=self.detailViewController;

    // Now Add the split view controller's view to the window and display.
    [self.window addSubview:self.splitViewController.view];
    self.window.rootViewController = self.splitViewController;
    [self.window makeKeyAndVisible];


    return YES;
}

2.push 和 pop ViewControllers

   push()
{
 AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
 MyViewController *Vc = [[MyViewController alloc]    initWithNibName:@"MyViewController" bundle:nil];

[appDelegate.detailNav pushViewController:Vc animated:NO];
}

pop()
{
    AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];

    [appDelegate.detailNav popViewControllerAnimated:NO];
}

Answer 1

最后我找到了解决方案，这是一个非常愚蠢的错误，我的 ViewController-3 是 UINavigationController 的委托(delegate)。

当我尝试将 viewController-2 弹出到 viewController-1 时，我的 UINavigationController 正在寻找它的委托(delegate)方法 - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)已弹出的 viewController-3 中的动画。

我将 rootViewController 设为 UINavigationController 的委托(delegate)，现在它工作正常。