AVPlayerLayer锁屏控件

Question

我正在使用AVPlayerLayer播放视频，并在应用程序进入后台时播放视频的音频。有没有什么办法可以在屏幕锁定时管理控件。用户想要停止播放音频。

我的应用程序在后台工作，但控件不可见，因此用户必须打开应用程序并停止视频。

Answer 1

我简单地使用了MPRemoteCommandCenter并添加了有关视频的详细信息，请参阅Objetive C++中的代码

//设置播放信息

- (void) setupNowPlayingInfoCenter{

    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [self becomeFirstResponder];

    MPRemoteCommandCenter *commandCenter = [MPRemoteCommandCenter sharedCommandCenter];
    [commandCenter.togglePlayPauseCommand setEnabled:YES];
    [commandCenter.playCommand setEnabled:YES];
    [commandCenter.pauseCommand setEnabled:YES];
    [commandCenter.nextTrackCommand setEnabled:NO];
    [commandCenter.previousTrackCommand setEnabled:NO];
    [commandCenter.playCommand addTargetWithHandler: ^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
        [self->_player play];
        return MPRemoteCommandHandlerStatusSuccess;
    }];

    [commandCenter.pauseCommand addTargetWithHandler: ^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
        [self->_player pause];
        return MPRemoteCommandHandlerStatusSuccess;
    }];
}

//进入后台更新播放信息

- (void) updateNowPlayingInfoCenter {

    NSDictionary *metadata = [self.media metaData];
    MPNowPlayingInfoCenter *playingInfoCenter = [MPNowPlayingInfoCenter defaultCenter];
    NSMutableDictionary *songInfo = [[NSMutableDictionary alloc] init];
    [songInfo setObject:metadata[MIBMediaMetaDataTrackNameKey] forKey:MPMediaItemPropertyTitle];
    [songInfo setObject:metadata[MIBMediaMetaDataTrackNameKey] forKey:MPMediaItemPropertyArtist];
    [songInfo setObject:metadata[MIBMediaMetaDataTrackDurationKey] forKey:MPMediaItemPropertyPlaybackDuration];
    [songInfo setObject:[NSNumber numberWithDouble:(!self.playing ? 0.0f : 1.0f)] forKey:MPNowPlayingInfoPropertyPlaybackRate];
    [playingInfoCenter setNowPlayingInfo:songInfo];
}

//在init或viewdidload中添加此行代码

NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
        [center addObserver:self selector:@selector(applicationDidEnterBackgroundNotification:)
                       name:UIApplicationDidEnterBackgroundNotification
                     object:nil];

在后台进入时调用这两个方法

- (void)applicationDidEnterBackgroundNotification:(NSNotification *)notification {

     [self setupNowPlayingInfoCenter];
     [self updateNowPlayingInfoCenter];
}