iphone - 解雇ModalViewControllerAnimated : (and dismissViewControllerAnimated) crashing in iOS 5

Question

我找不到任何合乎逻辑的解释，但事实仍然是，在iOS 5(xCode 4.2)中，如果我presentModalView:*animated:YES，我可以调用dismissModalViewAnimated:*很好，但如果我调用presentModalView:* animated:NO，则调用dismiss方法会崩溃。 (如果我使用新的presentViewController:animated:completion:+missViewControllerAnimated:效果相同)。我现在打算尝试解决这个问题(我不想让演示文稿动画化)并向苹果报告错误，但我已经为此苦恼了一段时间。欢迎任何和所有建议。 iOS 5 上的内容不多，所以请尽可能提供帮助。在 iOS 4 或 iOS 5 中不会崩溃的示例代码:

LoginController *loginController = [[LoginController alloc] initWithNibName:@"LoginControllerGG" bundle:nil];
[self presentModalViewController:loginController animated:YES];
[loginController release];
...
[self dismissModalViewControllerAnimated:YES];

这将在 iOS 5 中崩溃，并在拒绝调用时显示 EXC_BAD_ACCESS:

LoginController *loginController = [[LoginController alloc]    initWithNibName:@"LoginControllerGG" bundle:nil];
[self presentModalViewController:loginController animated:NO];
[loginController release];
...
[self dismissModalViewControllerAnimated:YES]; //crashes with EXC_BAD _ACCESS

注意一点:我在 loginController 中有一个动画，它发生在 viewDidLoad 上。看看去掉它是否会改变什么，但我想把它拿出来，因为我需要尽快找到解决方案。

<小时/>

[编辑]完整代码流程...在 AppDelegate 中，application:didFinishLaunchingWithOptions:

if (!loggedIn)  [myViewController showLoginPanel];

在 myViewController 中:

- (void)showLoginPanel {    
    LoginController *loginController = [[LoginController alloc] initWithNibName:@"LoginControllerGG" bundle:nil];
    if ([self respondsToSelector:@selector(presentViewController:animated:completion:)]) {
        [self presentViewController:loginController animated:NO completion:nil];
    } else {
        [self presentModalViewController:loginController animated:NO]; //iOS 4 works fine with or without animation   
    } 
    [loginController release];  
}

在登录 Controller 中:

- (IBAction)closeLoginWindow {
    [[NSNotificationCenter defaultCenter] postNotificationName:@"CloseLoginWindow" object:nil];
}   //doing it this way because calling on the self.parentViewController doesn't work

返回 myViewController:

- (void) viewDidLoad
    ...
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(closeLoginWindow) name:@"CloseLoginWindow" object:nil];
    ...

- (void)closeLoginWindow {
    if ([self respondsToSelector:@selector(dismissViewControllerAnimated:completion:)]) {
        [self dismissViewControllerAnimated:YES completion:nil];    //iOS 5 crashes only if presentation was not animated
    } else [self dismissModalViewControllerAnimated:YES];    //deleting the previous condition, iOS 5 still crashes if presentation was not animated
}    

Answer 1

在 iOS5 中，生命周期的管理以某种方式发生了变化，我无法详细解释该问题。无论如何，修复方法是将工作流程从 applicationDidFinishLaunchingWithOptions 推迟到 applicationDidBecomeActive。似乎有些东西没有在调用 applicationDidFinishLaunchingWithOptions 时正确初始化。

- (void)applicationDidFinishLaunchingWithOptions:... {    
    // in order to do this only at launching, but not on every activation 
    // Declaration as property for example
    applicationDidLaunch = YES;
}

- (void) applicationDidBecomeActive:(UIApplication *)application {
    if (applicationDidLaunch) {
        applicationDidLaunch = NO;
        [Start your login Workflow with modal view presenting here]
    }
}

很好奇你的反馈:)....