在更新到iOS 8.4后,我遇到了臭名昭著的MPMoviePlayerController
异常,错误信息如下:
An AVPlayerItem cannot be associated with more than one instance of AVPlayer
我看到有几种解决方法,主要是重新初始化播放器以便重用。但是对于我来说,崩溃不是发生在尝试播放新视频时,而是在将播放器退出全屏模式并旋转到纵向模式时。
这是我的代码:
@implementation MoviePlayerViewController
-(void)viewDidLoad
{
[super viewDidLoad];
self.moviePlayer.controlStyle = MPMovieControlStyleEmbedded;
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayerWillEnterFullscreenNotification:) name:MPMoviePlayerWillEnterFullscreenNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayerWillExitFullscreenNotification:) name:MPMoviePlayerWillExitFullscreenNotification object:nil];
}
- (void) moviePlayerWillEnterFullscreenNotification:(NSNotification*)notification
{
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceOrientationDidChange) name:UIDeviceOrientationDidChangeNotification object:nil];
}
- (void) moviePlayerWillExitFullscreenNotification:(NSNotification*)notification
{
[[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
}
- (void)deviceOrientationDidChange
{
UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
if (orientation == UIDeviceOrientationPortrait) {
[self.moviePlayer setFullscreen:NO animated:YES];
}
}
@end
进入全屏模式的变化发生在拥有 MoviePlayerViewController
作为子视图的 UIViewController
中:
-(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
if (!self.moviePlayerViewController.moviePlayer.fullscreen &&
UIInterfaceOrientationIsPortrait(fromInterfaceOrientation)) {
[self.moviePlayerViewController.moviePlayer setFullscreen:YES animated:YES];
}
}
当我使用播放器中的全屏按钮手动进入或退出全屏时,没有问题。我也可以很好地将播放器旋转到全屏模式。但是,当我尝试将其从全屏模式旋转出来(即从横屏模式旋转到竖屏模式),我会收到异常提示,似乎是在以下行中:
[self.moviePlayer setFullscreen:NO animated:YES];
当异常发生时,以下是我的堆栈跟踪:
Thread : Fatal Exception: NSInvalidArgumentException
0 CoreFoundation 0x00000001865e02d8 __exceptionPreprocess
1 libobjc.A.dylib 0x0000000197f3c0e4 objc_exception_throw
2 AVFoundation 0x0000000184db4b50 -[AVPlayerItem _attachToFigPlayer]
3 AVFoundation 0x0000000184da7770 -[AVPlayer _attachItem:andPerformOperation:withObject:]
4 AVFoundation 0x0000000184dc8f00 -[AVQueuePlayer insertItem:afterItem:]
5 MediaPlayer 0x00000001889d1d30 -[MPQueuePlayer insertItem:afterItem:]
6 MediaPlayer 0x000000018893de7c -[MPAVQueueCoordinator _syncPlayerItems]
7 MediaPlayer 0x000000018893d8a4 -[MPAVQueueCoordinator _syncItems]
8 MediaPlayer 0x000000018893c68c -[MPAVQueueCoordinator reloadItemsKeepingCurrentItem:]
9 MediaPlayer 0x000000018899fd38 -[MPAVPlaylistManager setPlaylistFeeder:startIndex:keepPlaying:]
10 MediaPlayer 0x000000018899fb4c __67-[MPAVPlaylistManager reloadWithPlaybackContext:completionHandler:]_block_invoke
11 MediaPlayer 0x000000018889fa5c -[MPArrayQueueFeeder reloadWithPlaybackContext:completionHandler:]
12 MediaPlayer 0x000000018899f9b4 -[MPAVPlaylistManager reloadWithPlaybackContext:completionHandler:]
13 MediaPlayer 0x00000001888b7550 -[MPAVController reloadWithPlaybackContext:completionHandler:]
14 MediaPlayer 0x000000018888d114 -[MPMoviePlayerControllerNew _prepareToPlayWithStartIndex:]
15 MediaPlayer 0x000000018888a988 -[MPMoviePlayerControllerNew _moviePlayerDidBecomeActiveNotification:]
16 CoreFoundation 0x00000001865862c4 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__
17 CoreFoundation 0x00000001864c3450 _CFXNotificationPost
18 Foundation 0x00000001873f2a80 -[NSNotificationCenter postNotificationName:object:userInfo:]
19 MediaPlayer 0x000000018888d530 -[MPMoviePlayerControllerNew _postNotificationName:object:userInfo:]
20 MediaPlayer 0x000000018888d494 -[MPMoviePlayerControllerNew _postNotificationName:object:]
21 MediaPlayer 0x00000001888878dc -[MPMoviePlayerControllerNew setFullscreen:animated:]
22 myApp 0x000000010004ddf8 -[MoviePlayerViewController deviceOrientationDidChange] (MoviePlayerViewController.m:36)
23 CoreFoundation 0x00000001865862c4 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__
24 CoreFoundation 0x00000001864c3450 _CFXNotificationPost
25 Foundation 0x00000001873f2a80 -[NSNotificationCenter postNotificationName:object:userInfo:]
26 UIKit 0x000000018b059b34 -[UIDevice setOrientation:animated:]
27 UIKit 0x000000018b0597f0 -[UIApplication handleEvent:withNewEvent:]
28 UIKit 0x000000018b059080 -[UIApplication sendEvent:]
29 UIKit 0x000000018b0c52c4 _UIApplicationHandleEvent
30 GraphicsServices 0x000000018fdc9194 _PurpleEventCallback
31 GraphicsServices 0x000000018fdc8c84 PurpleEventCallback
32 CoreFoundation 0x0000000186597a54 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__
33 CoreFoundation 0x00000001865979b4 __CFRunLoopDoSource1
34 CoreFoundation 0x0000000186595934 __CFRunLoopRun
35 CoreFoundation 0x00000001864c12d4 CFRunLoopRunSpecific
36 GraphicsServices 0x000000018fdc76fc GSEventRunModal
37 UIKit 0x000000018b0bef40 UIApplicationMain
38 myApp 0x000000010002b2dc main (main.m:16)
39 libdyld.dylib 0x00000001985e6a08 start
MPMoviePlayerController
并用AVPlayer
和AVPlayerViewController
替换它。MPMoviePlayerController
在iOS9中已被弃用,所以我不会再浪费时间在必须被替换的东西上了。 - pajevicAVPlayer
,并且在使用AVPlayer
和AVPlayerItem
时遇到了相同的崩溃问题。根本原因基本上就是描述所说的 - playerItem 实例不能附加到多个 player 实例上。有三个 API 调用可以将 playerItem 附加到 player 上:+playerWithPlayerItem:
、-initWithPlayerItem:
、-replaceCurrentItemWithPlayerItem:
。请注意确保一旦将 playerItem 附加到 player 上,就不要尝试将其附加到另一个 player 上。 - AnuragMPMoviePlayerController
时,这意味着我既没有直接联系AVPlayer
也没有直接联系AVPlayerItem
。此外,虽然人们经常报告在播放新视频时会出现此问题,但对我来说,它会在其他情况下发生,例如退出全屏模式时。 对我来说,这似乎确实像是一个错误,因为异常情况发生的时间我并没有启动任何新的流或其他操作。此外,在iOS 8.4之前从未出现过这个问题。 - pajevic