37

更新到 iOS 8.4 后，我得到了一个臭名昭著的异常MPMoviePlayerController，上面写着：

一个 AVPlayerItem 不能与多个 AVPlayer 实例关联

我见过几种解决方法，主要包括在重用之前重新初始化播放器。但是，对我来说，当我尝试播放新视频时不会发生崩溃，而是当我通过旋转到纵向模式关闭播放器的全屏时。

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

全屏更改发生在UIViewController具有MoviePlayerViewControlleras u 子视图的位置：

-(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。我也可以将播放器旋转到全屏就好了。但是，当我尝试将其从全屏旋转（即从横向到纵向）时，我得到了异常，似乎在行中：

[self.moviePlayer setFullscreen:NO animated:YES];

这是发生异常时的堆栈跟踪：

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
4

2 回答 2

1

解决方案是：

不要用MPMoviePlayerController，对不起。重构以AVPlayerViewController改用。这是一个更现代的 API；您正在使用的那个已被弃用，因此它在较新版本的 iOS 上发生奇怪的神秘崩溃并不令人震惊。

于 2015-10-27T11:55:38.697 回答
0

我有一个问题，你的问题听起来有点熟悉，但可能是也可能不是完全相同的问题。我有多个视图控制器，我正在安排一个视图控制器暂停其电影，以便另一个可以播放。但是当设备旋转时，我使用的标准 iOS 选项卡栏控制器将为选项卡栏上的任何其他选项卡加载其他视图控制器（我相信调用 viewDidLoad），如果它们尚未加载的话。我没想到会出现这种行为，因为我从未选择过这些选项卡。我加载电影的代码在 viewDidLoad 中，因此它试图在另一个从未被要求“出现”的视图控制器上开始播放另一部电影。

如果没记错的话，我将加载并开始播放电影的代码移到 viewWillAppear 中，这样除非真正选择了选项卡，否则它不会执行。然后当设备旋转时，突然加载另一个视图控制器，它没有不良副作用。看到它这样做仍然很奇怪。

于 2016-03-30T07:16:39.637 回答