Storyboard 的 Push Segue 问题

假如我有一个ViewController为MainVC，MainVC里两个按钮分别Trigger了两个Push Segue，Push到一个含有WebView的WebViewVC。两个Segue对应不同的Request地址。
我想做到假如WebView载入了某些地址，那么自动Pop回MainVC，MainVC embedded in NavigationController。
WebViewVC property如下
@property (weak, nonatomic) IBOutlet UIWebView *webView;
@property (weak, nonatomic) UINavigationController *source;
source属性在MainVC的prepareForSegue时指向MainVC
WebViewVC收到didFinish事件后判断，然后[self.source.navigationController popViewControllerAnimated: YES]
结果：
第一次成功，第二次失败，错误提示：
nested pop animation can result in corrupted navigation bar
Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted.

于是我改成了[self dismissViewControllerAnimated:YES completion:nil]，根本没有反应。
请问大家应该怎么解决？

Supplement 1 · Mar 12, 2014

刚测试了一下，webView delegate有个方法，End Loding后会检测URL是否为某个host，如果不是就pop。
假如push的时候request本来就不是这个host，会直接pop，然后这时候就会报错。
求解为啥

Supplement 2 · Mar 12, 2014

测试代码

in MainViewController

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn.frame = CGRectMake(100, 100, 50, 100);
[btn setTitle:@"Click to Push" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(pushVC:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:btn];
}

- (void)pushVC:(id)sender
{
SubViewController *sbvc = [[SubViewController alloc] init];
[self.navigationController pushViewController:sbvc animated:YES];
}

In SubViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[self.navigationController popViewControllerAnimated:YES];
}

2014-03-12 12:48:30.772 PushPopTest[1860:60b] nested pop animation can result in corrupted navigation bar
2014-03-12 12:48:31.125 PushPopTest[1860:60b] Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted.

就是这样的错误

Supplement 3 · Mar 12, 2014

原因：网速太快。

你让我情何以堪

MainVC

source

property

7 replies • 1970-01-01 08:00:00 +08:00