Uislider 与 Avplayer

Question

您好，我创建了 Avplayer 用于从服务器播放音频，它工作正常，但 UISlider 即使在更新 UISlider 方法后也不与音频同步，但滑块移动正常但不与音频同步。我需要将该音频与 UISlider 匹配

seekbar =[[UISlider alloc]init];
    seekbar.frame=CGRectMake(10,CGRectGetMinY(PlayAudio.frame)-50, CGRectGetWidth(self.view.frame)-20, 20);
   [seekbar addTarget:self action:@selector(seektime:) forControlEvents:UIControlEventValueChanged];
    seekbar.continuous=YES;
    [self.view addSubview:seekbar];
-(void)Audio{
    NSString *urlString= @"https:/embed-ssl.wistia.com/deliveries/85dcf8de9db3830f47f136a4dba89114be58403f/dhwpxq4l9l.wav";

    audioPlayer = [[AVPlayer alloc]initWithURL:[NSURL URLWithString:urlString]];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(playerItemDidReachEnd:)
                                                 name:AVPlayerItemDidPlayToEndTimeNotification
                                               object:[audioPlayer currentItem]];
    [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(updateProgress) userInfo:nil repeats:YES];
    [audioPlayer play];
    NSLog(@"Audio playing");
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {

    if (object == audioPlayer && [keyPath isEqualToString:@"status"]) {
        if (audioPlayer.status == AVPlayerStatusFailed) {
            NSLog(@"AVPlayer Failed");

        } else if (audioPlayer.status == AVPlayerStatusReadyToPlay) {
            NSLog(@"AVPlayerStatusReadyToPlay");
            [audioPlayer play];


        } else if (audioPlayer.status == AVPlayerItemStatusUnknown) {
            NSLog(@"AVPlayer Unknown");

        }
    }
}


- (void)seektime:(UISlider*)sender {
   CGFloat currentSongTime = CMTimeGetSeconds([audioPlayer currentTime]);
    seekbar.value = currentSongTime;

    seekbar.minimumValue=0;
    seekbar.maximumValue=currentSongTime;
}

- (void)updateProgress {

    [seekbar setValue:CMTimeGetSeconds(audioPlayer.currentTime)];
}

Answer 1

为什么每次更改都更改最大值？ 根据audioPlayer.currentItem.duration获取AVPlayerStatusReadyToPlay时可以设置minimumValue和maximumValue

所以你可以使用 seektime 而不是：

    else if (audioPlayer.status == AVPlayerStatusReadyToPlay) {
                NSLog(@"AVPlayerStatusReadyToPlay");
                [audioPlayer play];
                seekbar.minimumValue = 0;
                seekbar.maximumValue = CMTimeGetSeconds(audioPlayer.currentItem.duration);

    }