AVPlayer 实现简单的视频播放功能

// 声明两个对象
@property (nonatomic,strong)AVPlayer *player;//播放器对象
@property (nonatomic,strong)AVPlayerItem *currentPlayerItem;
// 初始化播放器
AVPlayerItem *playerItem = [[AVPlayerItem alloc] initWithURL:FullImageUrl(self.messageViewCover.userModel.video_url)];
self.currentPlayerItem = playerItem;
self.player = [[AVPlayer alloc] initWithPlayerItem:playerItem];
AVPlayerLayer *avLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
avLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
avLayer.frame = self.videoImage.bounds;
[self.videoImage.layer addSublayer:avLayer];
// 播放完成通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(runLoopTheMovie:) name:AVPlayerItemDidPlayToEndTimeNotification object:_player.currentItem];
//1.注册观察者，监测播放器属性
//观察Status属性，可以在加载成功之后得到视频的长度
[self.player.currentItem addObserver:self forKeyPath:@“status” options:NSKeyValueObservingOptionNew context:nil];
//观察loadedTimeRanges，可以获取缓存进度，实现缓冲进度条
[self.player.currentItem addObserver:self forKeyPath:@“loadedTimeRanges” options:NSKeyValueObservingOptionNew context:nil];
// 播放
[self.player play];
//循环播放用到这个方法

• (void)runLoopTheMovie:(NSNotification *)notification{
  AVPlayerItem *playerItem = notification.object;
  [playerItem seekToTime:kCMTimeZero];
  [_player play];
  }

//2.添加属性观察

• (void)observeValueForKeyPath:(NSString *)keyPath
  ofObject:(id)object
  change:(NSDictionary *)change
  context:(void *)context {
  AVPlayerItem *playerItem = (AVPlayerItem *)object;
  if ([keyPath isEqualToString:@“status”]) {
  //获取playerItem的status属性最新的状态
  AVPlayerStatus status = [[change objectForKey:@“new”] intValue];
  switch (status) {
  case AVPlayerStatusReadyToPlay:{
  //获取视频长度
  CMTime duration = playerItem.duration;
  //开始播放视频
  // [self.player play];
  break;
  }
  case AVPlayerStatusFailed:{//视频加载失败，点击重新加载
  break;
  }
  case AVPlayerStatusUnknown:{
  NSLog(@“未知问题:AVPlayerStatusUnknown”);
  break;
  }
  default:
  break;
  }
  } else if ([keyPath isEqualToString:@“loadedTimeRanges”]) {
  // //获取视频缓冲进度数组，这些缓冲的数组可能不是连续的
  // NSArray *loadedTimeRanges = playerItem.loadedTimeRanges;
  // //获取最新的缓冲区间
  // CMTimeRange timeRange = [loadedTimeRanges.firstObject CMTimeRangeValue];
  // //缓冲区间的开始的时间
  // NSTimeInterval loadStartSeconds = CMTimeGetSeconds(timeRange.start);
  // //缓冲区间的时长
  // NSTimeInterval loadDurationSeconds = CMTimeGetSeconds(timeRange.duration);
  // //视频缓冲时间总长度
  // NSTimeInterval currentLoadTotalTime = loadStartSeconds + loadDurationSeconds;
  // //NSLog(@“开始缓冲:%f,缓冲时长:%f,总时间:%f”, loadStartSeconds, loadDurationSeconds, currentLoadTotalTime);
  // //缓冲总时长
  // _currentLoadTimeLabel.text = [self formatTimeWithTimeInterVal:currentLoadTotalTime];
  // //视频的总时长
  // _totalNeedLoadTimeLabel.text = [self formatTimeWithTimeInterVal:CMTimeGetSeconds(self.player.currentItem.duration)];
  // //缓冲进度条的值
  // _progressView.progress = currentLoadTotalTime/CMTimeGetSeconds(self.player.currentItem.duration);
  }
  }