Question

我正在尝试让MPNowPlayingInfoCenter在暂停播放时正常工作。（我有一个使用AVPlayer播放的流媒体音乐应用程序，我正在通过Airplay播放我的Apple TV。）除了暂停之外的所有内容似乎都在Apple TV UI中正确反映出来。我正在这样初始化它：

MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
NSDictionary *songInfo = @{
    MPMediaItemPropertyTitle: title,
    MPMediaItemPropertyArtist: artist
};
center.nowPlayingInfo = songInfo;

由于我正在播放，因此在开始播放时我没有持续时间信息。当我从流中获得“就绪”信号时，我会更新在Apple TV上正确显示的持续时间：

MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
NSMutableDictionary *playingInfo = [NSMutableDictionary dictionaryWithDictionary:center.nowPlayingInfo];
[playingInfo setObject:[NSNumber numberWithFloat:length] forKey:MPMediaItemPropertyPlaybackDuration];
center.nowPlayingInfo = playingInfo;

当用户寻找音轨时，我也可以使用这种技术：

[playingInfo setObject:[NSNumber numberWithFloat:length * targetProgress] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];

我无法弄清楚的一件事是，如何暂停Apple TV上的播放头。当用户在我的UI中点击暂停时，我正在尝试执行以下操作：

MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
NSMutableDictionary *playingInfo = [NSMutableDictionary dictionaryWithDictionary:center.nowPlayingInfo];        
[playingInfo setObject:[NSNumber numberWithFloat:0.0f] forKey:MPNowPlayingInfoPropertyPlaybackRate];            
center.nowPlayingInfo = playingInfo;

而不是暂停，这使得播放头回到零并继续前进。

如何让播放头在Apple TV UI中正确暂停？

Answer 1

我有解决方案！仅设置MPMediaItemPropertyPlaybackDuration

1 - 启动曲目时，使用曲目的总持续时间设置属性：

MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
NSDictionary *songInfo = @{
    MPMediaItemPropertyTitle: title,
    MPMediaItemPropertyArtist: artist
    MPMediaItemPropertyPlaybackDuration : [NSNumber numberWithFloat:length]
};
center.nowPlayingInfo = songInfo;

2 - 当你暂停赛道时......什么都不做。

3 - 播放曲目时，使用currentTrackTime设置属性：

MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
NSMutableDictionary *playingInfo = [NSMutableDictionary dictionaryWithDictionary:center.nowPlayingInfo];        
[playingInfo setObject:[NSNumber numberWithFloat:player.currentTrackTime] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];            
center.nowPlayingInfo = playingInfo;

Answer 2

在这里搜索，这个工作非常好，将此添加到您的班级：

- (void)remoteControlReceivedWithEvent: (UIEvent *) receivedEvent {

    if (receivedEvent.type == UIEventTypeRemoteControl) {

        switch (receivedEvent.subtype) {

            case UIEventSubtypeRemoteControlTogglePlayPause:[self playPause:nil];

                break;

            default: break;
        }
    }
}

您可以添加其他CASE代码来向前或向后添加功能：

case UIEventSubtypeRemoteControlBeginSeekingBackward:[self yourBackward:nil];
                break;

要调用播放暂停，您需要创建一个这样的动作：

- (IBAction)playPause:(id)sender {

    if (yourPlayer.rate == 1.0){

        [yourPlayer pause];
    } else if (yourPlayer.rate == 0.0) {

        [yourPlayer play];
    }
}

重要提示：您添加的任何案例都需要IBAction

希望这能帮到你

Answer 3

MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
NSDictionary *songInfo = @{
    MPMediaItemPropertyTitle: title,
    MPMediaItemPropertyArtist: artist
};

像

这样的电话

center setnowPlayingInfo = songInfo;

暂停播放时，MPNowPlayingInfoCenter无法正常响应

3 个答案: