iOS 音乐播放器之MPNowPlayingInfoCenter

#pragma 更新锁屏界面信息

- (void)updateLockScreenInfo {

    if (!musicManager.player) {

        return;

    }

    // 1.获取锁屏中心

    MPNowPlayingInfoCenter *playingInfoCenter = [MPNowPlayingInfoCenter defaultCenter];

    // 初始化一个存放音乐信息的字典

    NSMutableDictionary *playingInfoDict = [NSMutableDictionary dictionary];

    // 2、设置歌曲名

    [playingInfoDictsetObject:@"Avengers"

                        forKey:MPMediaItemPropertyTitle];

    //专辑

    [playingInfoDictsetObject:@"Avengers"

                        forKey:MPMediaItemPropertyAlbumTitle];

    // 3、设置封面的图片

    UIImage*image = [UIImageimageNamed:@"haveno"];

    if(image) {

        MPMediaItemArtwork *artwork = [[MPMediaItemArtwork alloc] initWithImage:image];

        [playingInfoDictsetObject:artworkforKey:MPMediaItemPropertyArtwork];

    }

    // 4、设置歌曲的时长和已经消耗的时间

    NSNumber*playbackDuration =@(CMTimeGetSeconds(musicManager.player.currentItem.duration));

    NSNumber*elapsedPlaybackTime =@(CMTimeGetSeconds(musicManager.currentItem.currentTime));

    if(!playbackDuration || !elapsedPlaybackTime) {

        return;

    }

    [playingInfoDictsetObject:playbackDuration

                        forKey:MPMediaItemPropertyPlaybackDuration];

    [playingInfoDictsetObject:elapsedPlaybackTime

                        forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];

    [playingInfoDictsetObject:@(musicManager.player.rate) forKey:MPNowPlayingInfoPropertyPlaybackRate];

    //音乐信息赋值给获取锁屏中心的nowPlayingInfo属性

    playingInfoCenter.nowPlayingInfo= playingInfoDict;

}

#pragma mark-- 远程控制

- (void)createRemoteCommandCenter {

    MPRemoteCommandCenter *commandCenter = [MPRemoteCommandCenter sharedCommandCenter];

    MPRemoteCommand*pauseCommand = [commandCenterpauseCommand];

    [pauseCommandsetEnabled:YES];

    [pauseCommandaddTarget:selfaction:@selector(remotePauseEvent)];

    MPRemoteCommand*playCommand = [commandCenterplayCommand];

    [playCommandsetEnabled:YES];

    [playCommandaddTarget:selfaction:@selector(remotePlayEvent)];

    MPRemoteCommand*nextCommand = [commandCenternextTrackCommand];

    [nextCommandsetEnabled:YES];

    [nextCommandaddTarget:selfaction:@selector(remoteNextEvent)];

    MPRemoteCommand*previousCommand = [commandCenterpreviousTrackCommand];

    [previousCommandsetEnabled:YES];

    [previousCommandaddTarget:selfaction:@selector(remotePreviousEvent)];

    if(@available(iOS9.1, *)) {

        MPRemoteCommand*changePlaybackPositionCommand = [commandCenterchangePlaybackPositionCommand];

        [changePlaybackPositionCommandsetEnabled:YES];

        [changePlaybackPositionCommandaddTarget:selfaction:@selector(remoteChangePlaybackPosition:)];

    }

}

//暂停

-(void)remotePauseEvent {

    [musicManager pause];

     [self updateLockScreenInfo];

}

//播放

-(void) remotePlayEvent{

    [musicManager play];

     [self updateLockScreenInfo];

}

//快进

-(void) remoteNextEvent{

      [musicManager fastForward];

     [self updateLockScreenInfo];

}

//快退

-(void)remotePreviousEvent{

      [musicManager fastBack];

     [self updateLockScreenInfo];

}

//跳跃

-(void)remoteChangePlaybackPosition:(MPRemoteCommand*)command{

//跳跃操作

     [self updateLockScreenInfo];

}

- (void)dealloc {

    [self removeCommandCenterTargets];

}

- (void)removeCommandCenterTargets {

    MPRemoteCommandCenter *commandCenter = [MPRemoteCommandCenter sharedCommandCenter];

    [[commandCenterplayCommand]removeTarget:self];

    [[commandCenterpauseCommand]removeTarget:self];

    [[commandCenternextTrackCommand] removeTarget:self];

    [[commandCenterpreviousTrackCommand] removeTarget:self];

    if(@available(iOS9.1, *)) {

        [commandCenter.changePlaybackPositionCommand removeTarget:self];

    }

}