wait_fences：未能接收回复：10004003？ [英] wait_fences: failed to receive reply: 10004003?

问题描述

我得到这个神秘的消息：wait_fences：未能接收回复：10004003
我有google了，人们认为它有关的事情没有正确地关闭UITextField或警报。我有一个文本字段在我的应用程序，我保证你使用resignFirstResponder等正确释放它...
当我从一个子视图打开一个MPMusicPickerController，我得到这个消息，这有什么区别。我真的需要得到这个固定的，因为它是搞砸我的整个应用程序！

谢谢，
布拉德

Edit1：

   - （IBAction）openMediaPicker：（id）sender {
 [[UIApplication sharedApplication] setStatusBarHidden ：YES withAnimation：UIStatusBarAnimationFade]; 
 MPMediaPickerController * mediaPicker = [[MPMediaPickerController alloc] initWithMediaTypes：MPMediaTypeAny]; 
 mediaPicker.delegate = self; 
 mediaPicker.allowsPickingMultipleItems = YES; 
 mediaPicker.prompt = @选择要播放的歌曲; 
 [self presentModalViewController：mediaPicker animated：YES]; 
 [mediaPicker release]; 
} 
 
 //媒体选择器委托方法
  - （void）mediaPicker：（MPMediaPickerController *）mediaPicker didPickMediaItems：（MPMediaItemCollection *）mediaItemCollection {
 
 AppAppDelegate * appDelegate =（AppAppDelegate *）[[UIApplication sharedApplication] delegate]; 
 [appDelegate.tr2 stop]; 
 [playstopButton setHidden：NO]; 
 [playstopButton setImage：[UIImage imageNamed：@Stop-Music-Button.png] forState：UIControlStateNormal]; 
 //我们需要关闭选择器
 [self dismissModalViewControllerAnimated：YES]; 
 [[UIApplication sharedApplication] setStatusBarHidden：NO withAnimation：UIStatusBarAnimationFade]; 
 
 //将所选项目分配给音乐播放器并开始播放。 
 [self.musicPlayer stop]; 
 [self.musicPlayer setQueueWithItemCollection：mediaItemCollection]; 
 [self.musicPlayer play]; 
 
} 
 
  - （void）mediaPickerDidCancel：（MPMediaPickerController *）mediaPicker {
 //用户没有选择任何东西
 //我们需要关闭选择器
 [self dismissModalViewControllerAnimated：YES]; 
 [[UIApplication sharedApplication] setStatusBarHidden：NO withAnimation：UIStatusBarAnimationFade]; 
} 
  

解决方案

1. 您不应在中执行任何动画viewWillAppear viewDidAppear 。只在 viewWillAppear 中准备您的数据，插座等。




2. c $ c> wait_fences 可能出现的是当你有一个动画对话框（像你的 MPMediaPickerController ）导致另一个动画视图出现modal UIViewController ）等，在这种情况下，你需要推迟第二个视图控制器的呈现如下：

     [self performSelector：@selector（showMyOtherViewController）
    withObject：nil 
    afterDelay：0.1]; 
     

http://stackoverflow.com/7194182\">http://stackoverflow.com/7194182 。

编辑 / p>

一个调试冲突动画的好方法是简单地将动画设置为 NO

  [self presentModalViewController：mediaPicker animated：YES]; 
 [self dismissModalViewControllerAnimated：YES]; 
  

只需执行：

  [self presentModalViewController：mediaPicker animated：NO]; 
 [self dismissModalViewControllerAnimated：NO]; 
  

并检查 wait_fences 错误是否消失并且实现了正确的行为（但没有动画）。如果是这种情况，你需要一些 performSelector：withObject：afterDelay： -magic。

编辑：请注意，您可以在iOS 5.0中执行以下操作：

  [self dismissViewControllerAnimated：YES completed：^ {
 [self presentViewController：anotherViewController animated：YES completed：NULL] 
} 
  

这意味着首先，当前呈现的视图控制器（例如ModalViewController）被关闭，当动画完成时，你可以调用另一个块。在这种情况下显示另一个 UIViewController

I am getting this cryptic message: wait_fences: failed to receive reply: 10004003 I have googled and people think it has something to do with not properly dismissing a UITextField or Alert. I have one textfield in my app and I assure you I release it properly using resignFirstResponder, etc... I get this message when I am opening a MPMusicPickerController from a subview, does that make any difference. I really need to get this fixed because it is messing up my whole app!

Thanks, Brad

Edit1:

    - (IBAction)openMediaPicker:(id)sender {
    [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
    MPMediaPickerController *mediaPicker = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeAny];
    mediaPicker.delegate = self;
    mediaPicker.allowsPickingMultipleItems = YES;
    mediaPicker.prompt = @"Select songs to play";
    [self presentModalViewController:mediaPicker animated:YES];
    [mediaPicker release];
} 

// Media picker delegate methods
- (void)mediaPicker: (MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection {

    AppAppDelegate *appDelegate = (AppAppDelegate *)[[UIApplication sharedApplication] delegate];
    [appDelegate.tr2 stop];
    [playstopButton setHidden:NO];
    [playstopButton setImage:[UIImage imageNamed:@"Stop-Music-Button.png"] forState:UIControlStateNormal];
    // We need to dismiss the picker
    [self dismissModalViewControllerAnimated:YES];
    [[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationFade];

    // Assign the selected item(s) to the music player and start playback.
    [self.musicPlayer stop];
    [self.musicPlayer setQueueWithItemCollection:mediaItemCollection];
    [self.musicPlayer play];

}

- (void)mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker {
    // User did not select anything
    // We need to dismiss the picker
    [self dismissModalViewControllerAnimated:YES];
    [[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationFade];
}

解决方案

Generally:

1. You should not do any animations in viewWillAppear only in viewDidAppear. Only prepare your data, outlets etc. in viewWillAppear.

2. Also a very common case where wait_fences might arise is when you have an animated dialog (Like your MPMediaPickerController) that causes another animated view to appear (Like a custom modal UIViewController) or the like, in which case you need to "postpone" the presentation of the second viewcontroller like this:

       [self performSelector:@selector(showMyOtherViewController) 
                  withObject:nil 
                  afterDelay:0.1];
   

Also check out this answer http://stackoverflow.com/7194182.

Edit

A good way to "debug" conflicting animations is to simply set the animation to NO so in your code instead of

    [self presentModalViewController:mediaPicker animated:YES];
    [self dismissModalViewControllerAnimated:YES];

Simply do:

    [self presentModalViewController:mediaPicker animated:NO];
    [self dismissModalViewControllerAnimated:NO];

and check if the wait_fences error goes away and the correct behaviour (but without animation) is achieved. If this is the case you need some of the performSelector:withObject:afterDelay:-magic.

Edit: Please note that you can do the following in iOS 5.0:

[self dismissViewControllerAnimated:YES completion:^{
    [self presentViewController:anotherViewController animated:YES completion:NULL]
}

That means that first, the currently presented View Controller (e.g. a ModalViewController) is dismissed and when the animation is finished you can invoke another block. In this case show another UIViewController

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