如果屏幕锁定，单击暂停按钮时 avplayer 不会暂停

如果应用程序正在播放音频并且手机屏幕被锁定，则控制屏幕如下所示。我无法对 avplayer 执行任何操作

在我的应用程序委托中，我实现了：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    MPRemoteCommandCenter *rcc = [MPRemoteCommandCenter sharedCommandCenter];
[[rcc skipForwardCommand] setEnabled:NO];
[[rcc skipBackwardCommand] setEnabled:NO];
[[rcc nextTrackCommand] setEnabled:NO];
[[rcc previousTrackCommand] setEnabled:NO];
[[rcc skipForwardCommand] setEnabled:NO];
[[rcc skipBackwardCommand] setEnabled:NO];
rcc.playCommand.enabled = YES;
rcc.pauseCommand.enabled = YES;
[[MPRemoteCommandCenter sharedCommandCenter].playCommand addTarget:self action:@selector(play)];
[[MPRemoteCommandCenter sharedCommandCenter].pauseCommand addTarget:self action:@selector(pause)];
}

- (void) play {
[[MyVideoController instance] play];
}

- (void) pause {
[[MyVideoController instance] pause];
}

MyVideoController 类包含：

- (void) pause {
    [self.avPlayer pause];
}

- (void) play {
    [self.avPlayer play];
}

即使这些方法被触发（添加断点来检查），avplayer 上也不会执行任何操作。不管怎样，avplayer都不会暂停。

有什么办法可以暂停avplayer吗？

编辑1： 添加完整代码

在我的 AppDelegate 中：

- (void) remoteControlReceivedWithEvent: (UIEvent *) event {
[[ZVideoPlayerController instance] eventReceived:event];
if (event.type == UIEventTypeRemoteControl) {
    switch (event.subtype) {
        case UIEventSubtypeRemoteControlTogglePlayPause: {

            break;
        }
        case UIEventSubtypeRemoteControlPlay: {
            [[ZVideoPlayerController instance] play];
            break;
        }
        case UIEventSubtypeRemoteControlPause: {
            [[ZVideoPlayerController instance] pause];
            break;
        }
        default:
            break;
    }
}

}

- (void)applicationDidEnterBackground:(UIApplication *)application {
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
}

我正在接收事件，但在 AVPlayer 上调用暂停方法时音频不会暂停。

编辑2： PlayerController 类中的实例声明

+ (instancetype)instance {
static id instance = nil;
if (instance == nil)
{
    static dispatch_once_t onceToken = 0;
    dispatch_once(&onceToken, ^(void) {
        NSAssert(instance == nil, @"Singleton instance is already allocated.");
        instance = [[super allocWithZone:NULL] init];
    });
}
return instance;
}

初始化AVPlayer

    AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:url options:nil];
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:avAsset];
AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayback error:nil];
NSError *activationError = nil;
BOOL success = [[AVAudioSession sharedInstance] setActive: YES error: &activationError];

NSMutableDictionary *songInfo = [[NSMutableDictionary alloc] init];

MPMediaItemArtwork *albumArt = [[MPMediaItemArtwork alloc] initWithImage: [UIImage imageNamed:@"Audio_Thumbnail_Play"]];
[songInfo setObject:title forKey:MPMediaItemPropertyTitle];
[songInfo setObject:@"100" forKey:MPMediaItemPropertyPlaybackDuration];
[songInfo setObject:albumArt forKey:MPMediaItemPropertyArtwork];
[[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:songInfo];
self.avPlayer = [AVPlayer playerWithPlayerItem:playerItem];
self.avPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:self.avPlayer];

我找到了解决问题的办法。当我获得 avPlayer 的 nil 值时，我使用 PageViewController 类来获取 PlayerController 的实例。然后我使用这个playerController的实例来播放和暂停我的avplayer，因为这个实例保存了对avPlayer的引用。

- (PlayerController *)getVideoController {
NSArray *controllers = [UtiliyClass getNavigationController].viewControllers;
PageViewController *pageController = nil;
for (UIViewController *cont in controllers) {
    if ([cont isKindOfClass:[PageViewController class]]) {
        pageController = (PageViewController *)cont;
        break;
    }
}
if (pageController == nil) {
    return nil;
}
NSArray *objectsController =pageController.pageController.viewControllers;
PlayerController *videoPlayerController = nil;
for (UIViewController *item in objectsController) {
    if ([item isKindOfClass:[PlayerController class]]) {
        videoPlayerController = (PlayerController *)item;
        break;
    }
}
return videoPlayerController;
}

- (void) pause {
PlayerController *controller = [self getVideoController];
[controller.avPlayer pause];
}

- (void) play {
PlayerController *controller = [self getVideoController];
[controller.avPlayer play];
}