Iphone dismissModalViewControllerAnimated:（和dismissViewControllerAnimated）在iOS 5中崩溃

我找不到任何合乎逻辑的解释，但事实是，在iOS 5（xCode 4.2）中，如果我呈现ModalView:*动画：是的，我可以调用DismissModalViewWanimated:*很好，但如果我调用presentModalView:*动画：否，则调用Dismise方法会崩溃。（如果使用新的presentViewController:animated:completion:+dismissViewControllerAnimated:，效果相同）。我现在正试图解决这个问题（我不想让演示动画化），并向苹果报告一个bug，但我已经为此绞尽脑汁了一段时间。欢迎提出任何建议。在iOS 5上没有太多，所以如果可以，请提供帮助。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，并在解除呼叫时执行EXC_BAD_访问：

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：我在loginController中有一个在viewDidLoad上发生的动画。我想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

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[编辑]完整代码流。。。在AppDelegate中，应用程序：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];  
}

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

- (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
}    

在loginController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];  
}

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

- (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
}    

回到myViewController：

- (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];  
}

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

- (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
}    

---

在iOS5中，生命周期的管理发生了某种变化，我无法详细解释这个问题。无论如何，解决方法是将工作流从ApplicationIDFinishLaunchingWithOptions推迟到ApplicationIDBecomeActive。在调用ApplicationIDFinishLaunchingWithOptions时，似乎有些东西没有正确初始化

- (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]
    }
}

---

好奇你的反馈：）…

我会加上我的2美分：我有ImagePickerController，只有在我没有手动释放picker（IOS 5 SDK）的情况下，它才能被解除

所以。对于您的情况，我可以提供以下解决方法： 1.删除行-[loginController release]； 2.要防止内存泄漏，请将loginController作为属性添加到当前控制器，并仅在当前控制器的dealloc（）中释放它：

@interface myViewController : UIViewController 

@property (nonatomic, retain) LoginController *loginController;

@end

...

@implementation myViewController

- (void)showLoginPanel {    
    self.loginController = [[LoginController alloc] initWithNibName:@"LoginControllerGG" bundle:nil];
     // ... something goes here  
}

-(IBAction)loginClose() 
{
    // this should close all windows as far as you call it from current (main) controller
    [self dismissModalViewControllerAnimated:YES]; 
    // ... then anything you want EXCEPT [loginController release];
}

-(void)dealloc() 
{
    [loginController release];
}

@end

祝你好运：）

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另外，我刚刚写了这篇文章，所以这只是一个如何欺骗它的想法。也许有人会纠正我。。。尽管无论如何它对我有效。

正如我所怀疑的，从loginController的viewDidLoad方法中删除动画与此问题无关。在这里抓救命稻草，真奇怪。您确定没有在[loginController release]之外的任何地方释放loginController吗？我会检查以确定，但是更改动画标志并保持所有其他代码不变会导致崩溃。我认为不管动画如何，管理问题都会出现，但目前还无法解释，所以我一定会检查。@Manali，还有其他方法可以实例化该类，但在崩溃时不存在。我将编辑我的帖子以显示确切的流程。只需输入一个NSLog来检查可能会释放视图的内存不足警告，我没有警告，也没有出现日志。看起来我不必像我所想的那样通过并将所有presentModalViewController调用更改为presentViewController调用。嗯，我可以把它保存到下一个版本。我也有同样的问题，只是把它移到了DidBecomeActive并提交了修复程序，以便在商店里有一个无bug的版本。。。不知道苹果的生命周期发生了什么变化……这对我没有帮助：我打开了showLoginPanel（iAction），登录关闭作为回调，但在主线程中，logincontroller仅在dealloc中松弛，我有crach：