恢复AVPlayer视频播放应用程序后变得活跃(Resume AVPlayer video play

我写信AVPlayer视频播放自定义播放器。据苹果文档设置视频层：

    self.player = [IPLPlayer new];
    self.player.playerLayer = (AVPlayerLayer *)self.playerView.layer;

其中self.playerView是从这些文档通常类：

    @implementation PlayerView

+ (Class) layerClass {
    return [AVPlayerLayer class];
}

- (AVPlayer *)player {
    return [(AVPlayerLayer *)[self layer] player];
}

- (void)setPlayer:(AVPlayer *) player {
    [(AVPlayerLayer *) [self layer] setPlayer:player];
}

问题是：当关闭App（Home键），或块屏幕，视频播放停止，而当简历只有音频播放恢复，屏幕上的影像仍然是那些是块屏幕前 - 这是完全静态和辅币帧。

如何恢复视频播放画面被堵塞后？

看来我必须要注册通知，并且应用程序后，变为有效简历视频层：

    -(void)registerNotification
{
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(willEnterBackground)
                                                 name:UIApplicationWillResignActiveNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(didEnterForeground)
                                                 name:UIApplicationDidBecomeActiveNotification object:nil];
}

-(void)unregisterNotification
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}


-(void)willEnterBackground
{
    NSLog(@"willEnterBackground");
    [self.playerView willEnterBackground];
}

-(void)didEnterForeground
{
    NSLog(@"didEnterForeground");
    [self.playerView didEnterForeground];
}

Answer 1:

而一个解决方案结合在一起，所有这些信息。

也许球员状态应该为不同的处理，但我喜欢的递归的方式。

注意：如果你不需要精确的查找时间，你可以使用[_player seekToTime:<#(CMTime)#> completionHandler:<#^(BOOL finished)completionHandler#>]它的速度更快，但它试图到最近的关键帧。

- (void)viewDidLoad
{
    [super viewDidLoad];

....

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appEnteredForeground) name:UIApplicationWillEnterForegroundNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appEnteredBackground) name:UIApplicationDidEnterBackgroundNotification object:nil];
}

-(void)viewWillDisappear:(BOOL)animated
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillEnterForegroundNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidEnterBackgroundNotification object:nil];
}

....

-(void) appEnteredForeground {
    AVPlayerLayer *player = (AVPlayerLayer *)[playerView layer];
    [player setPlayer:NULL];
    [player setPlayer:_player];
    [self playAt:currentTime];
}

-(void) appEnteredBackground {
    [_player pause];
    currentTime = [_player currentTime];
}

-(void)playAt: (CMTime)time {
    if(_player.status == AVPlayerStatusReadyToPlay && _player.currentItem.status == AVPlayerItemStatusReadyToPlay) {
        [_player seekToTime:time toleranceBefore:kCMTimeZero toleranceAfter:kCMTimeZero completionHandler:^(BOOL finished) {
            [_player play];
        }];
    } else {
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [self playAt:time];
        });
    }
}

Answer 2:

这对我的作品的斯威夫特3

添加的地方而设置的观点：

NotificationCenter.default.addObserver(self, 
  selector: #selector(appWillEnterForegroundNotification),
  name: .UIApplicationWillEnterForeground, object: nil)

抓住你的播放器，并迫使它发挥：

func appWillEnterForegroundNotification() {
  myPlayer.play()
}

不要忘记删除观察员，当你不需要他们：

override func viewWillDisappear(_ animated: Bool) {
  super.viewWillDisappear(animated)
  NotificationCenter.default.removeObserver(self)
}

Answer 3:

使用UIApplicationWillEnterForegroundNotification为好。你知道你的应用程序将是积极和明显的给用户的方法：

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(appEnteredForeground:) name:UIApplicationWillEnterForegroundNotification object:nil];