使用AVPlayer播放在线音乐

1、创建AVPlayer播放器

- (AVPlayer *)audioPlayer
{
    if (!_audioPlayer) {
        AVPlayerItem *item = [[AVPlayerItem alloc] initWithURL:[NSURL URLWithString:self.introModel.url]];
        _audioPlayer = [[AVPlayer alloc] initWithPlayerItem:item];;
    }
    return _audioPlayer;
}

2、播放

//如果上次播放失败，再次播放时就播放不出声音了，所以这里要replace一下
AVPlayerItem *item = [[AVPlayerItem alloc] initWithURL:url];
[self.audioPlayer replaceCurrentItemWithPlayerItem:item];
[self.audioPlayer play];

3、暂停

[self.audioPlayer pause];

4、播放状态监听

[self.audioPlayer addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];

处理状态

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context
{
    if ([object isEqual:self.audioPlayer] && [keyPath isEqualToString:@"status"]) {
        NSNumber *status = [change valueForKey:NSKeyValueChangeNewKey];
        switch (status.integerValue) {
            case AVPlayerStatusUnknown:{
                break;
            }
            case AVPlayerStatusReadyToPlay:{
                break;
            }
            case AVPlayerStatusFailed: {
                break;
            }
            default:
                break;
        }
    }
}

最后别忘了移除KVO

[_audioPlayer removeObserver:self forKeyPath:@"status"];

5、更新当前播放时间

__weak typeof(self) weakself = self;
self.audioObserver = [_audioPlayer addPeriodicTimeObserverForInterval:CMTimeMake(1, 2) queue:dispatch_get_main_queue() usingBlock:^(CMTime time) {
    __strong typeof(weakself) self = weakself;
    if (self.audioPlayer.rate == 1.0) {
        [self startPlayAnimation];
    } else if (self.audioPlayer.rate == 0.0) {
        [self stopPlayAnimation];
    }
}];

最后移除时间更新

[_audioPlayer removeTimeObserver:self.audioObserver];

6、添加视频播放通知

//播放完成
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playFinish:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];
//播放出错
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playError:) name:AVPlayerItemFailedToPlayToEndTimeNotification object:nil];

移除通知

[[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemDidPlayToEndTimeNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:AVPlayerItemFailedToPlayToEndTimeNotification object:nil];

7、当前是否在播放

//iOS 10添加了timeControlStatus标记播放状态，之前版本用rate是否为0来判断播放状态
- (BOOL)isPlaying
{
    if ([self.audioPlayer respondsToSelector:@selector(timeControlStatus)]) {
        return self.audioPlayer.timeControlStatus == AVPlayerTimeControlStatusPlaying ? true : false;
    } else {
        if (self.audioPlayer.rate == 0.0) {
            return false;
        } else {
            return true;
        }
    }
}