UINavigationController'损坏的导航栏'问题 [英] UINavigationController 'corrupted navigation bar' issue

问题描述

我遇到严重的问题，让我的导航控制器工作，并尝试了几乎每一个相关的问题在这个网站。

I'm having serious problems getting my navigation controller to work and have tried pretty much every related question on this website.

我的问题是，当我执行以编程方式，在导航栏中似乎有一个过渡，但是视图不会改变。我看到以下错误：

My problem is that when I perform a segue programmatically, there appears to be a transition in the navigation bar, but the view doesn't change. I see the following errors instead:

2013-10-22 13:47:30.059 App[2236:a0b] nested push animation can result in corrupted navigation bar
2013-10-22 13:47:30.411 App[2236:a0b] Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted.
2013-10-22 13:47:30.501 App[2236:a0b] Unbalanced calls to begin/end appearance transitions for 

$ b $的开始/结束外观转换的不平衡调用b

我的故事板看起来像这样：

My storyboard looks like this:

在LoginViewController中，我们根据一些条件执行segue：

In LoginViewController we perform a segue based on some condition:

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear];
    NSString* appState = [AppConfig getAppState];
    if ([appState isEqualToString:APP_STATE_WAITING]) {
        [self performSegueWithIdentifier:@"Load" sender:self];
    }
    else if ([appState isEqualToString:APP_STATE_REGISTRATION_AVAILABLE]) {
        [self performSegueWithIdentifier:@"SignUp" sender:self];
    }
}

在LoadingViewController中，我们等待来自Web服务的响应之前：

In LoadingViewController we wait for a response from a web service before doing:

- (void)segueToWaitingList:(NSUInteger)behind inFront:(NSUInteger)inFront
{
    [MosaycOptions setAppState:APP_STATE_WAITING];
    dispatch_async(dispatch_get_main_queue(), ^{
         [self performSegueWithIdentifier:@"Waiting" sender:self];
    });
}

这是segue，给我的问题。导航栏转换，但视图不会，我们看到以下错误打印出来：

And it is that segue that gives me the problem. The nav bar transitions but the view does not and we see the following errors printed out:

2013-10-22 13:47:30.059 App[2236:a0b] nested push animation can result in corrupted navigation bar
2013-10-22 13:47:30.411 App[2236:a0b] Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted.
2013-10-22 13:47:30.501 App[2236:a0b] Unbalanced calls to begin/end appearance transitions for 

$ b $的开始/结束外观转换的不平衡调用b

应用程序不会崩溃，但没有发生segue，它不会转换到等待列表视图，而只是停留在加载并将错误输出到控制台。当我按回来而不是回到登录屏幕时，我得到以下空白屏幕：

The app doesn't crash, but no segue occurs, it doesn't transition to the waiting list view but simply stays on Loading and prints the error to console. When I press back rather than moving back to the login screen I get the following blank screen:

如果我再次按回来，会发生此错误： http://pastebin.com/7mCyeQv9

If I press back again it crashes with this error: http://pastebin.com/7mCyeQv9

很明显，导航堆栈，但是我已经使用调试器检查它，它看起来绝对精细，一切正常推送。我不能为我的生活计算出来。

Something is clearly getting messed up with the navigation stack, however i've inspected it using the debugger and it looks absolutely fine, everything gets pushed as normal. I can't for the life of me figure it out. This is just a standard navigation controller setup that i've used before.

任何想法？

推荐答案

我终于找出了问题。

performSegueWithIdentifier c $ c> viewDidAppear 在LoadingViewController上被调用。同步错误基本上。

performSegueWithIdentifier was being called before viewDidAppear was called on the LoadingViewController. A synchronisation error basically.

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