MPNowPlayingInfoCenter播放暂停图像不会改变

Question

我正在使用以下代码。一旦应用程序进入后台，这段代码就能完美运行。如果应用程序没有进入后台并且我们尝试播放和暂停当前播放的歌曲，则播放和暂停图像不会改变。每次断点进入此case UIEventSubtypeRemoteControlPause:案例的广告。

albumArt= [[MPMediaItemArtwork alloc] initWithImage: img.image];
            NSDictionary *playingNowInfo = @{MPMediaItemPropertyTitle: (self.currentItem.songname==nil) ? (@"") : (self.currentItem.songname),
                                             MPMediaItemPropertyPlaybackDuration: @(self.currentItem.duration),
                                             MPMediaItemPropertyArtist:[MusicSetting getArtistName],
                                             MPMediaItemPropertyAlbumTitle:(self.currentItem.albumname==nil) ? (@"") : (self.currentItem.albumname),
                                             MPNowPlayingInfoPropertyPlaybackRate: @(self.player.rate),
                                             MPNowPlayingInfoPropertyElapsedPlaybackTime: @(CMTimeGetSeconds(self.player.currentItem.currentTime)),
                                             MPMediaItemPropertyArtwork:albumArt,
                                             };
            [MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo = playingNowInfo;

#pragma mark - Remote Control

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

  //  [self.manager remoteControlReceivedWithEvent:receivedEvent];
    if (receivedEvent.type == UIEventTypeRemoteControl) {

        switch (receivedEvent.subtype) {

            case UIEventSubtypeRemoteControlPlay:
                [self Onclick_Play_Pause:self];
                break;

            case UIEventSubtypeRemoteControlPause:
                [self Onclick_Play_Pause:self];
                 break;

            case UIEventSubtypeRemoteControlTogglePlayPause:

                //if ([self.manager.player isPlaying])
                if(self.manager.player.rate != 0)
                {
                    [self.manager.player pause];
                }

                else {
                    [self.manager.player play];
                }
                break;
            case UIEventSubtypeRemoteControlNextTrack:
                [self Onclick_next:self];
                NSLog(@"Next song play");
                break;
            case UIEventSubtypeRemoteControlPreviousTrack:
                [self Onclick_prev:self];
                NSLog(@"Prev song play");
                break;

            default:
                break;
        }
    }
}

- (IBAction)Onclick_Play_Pause:(id)sender {
    (AppObj).playerview_height=playviewHeight;

    if(self.manager.player.rate != 0)
    {
        [MusicSetting set_SongStatus:@"Pause"];
        [self.Play_PauseBtn setImage:[UIImage imageNamed:@"pauseImg"] forState:UIControlStateNormal];
        [self.manager pause];
    }
    else {
        [MusicSetting set_SongStatus:@"Play"];
        [MusicSetting set_isMusicPlay:@"Playing"];

        [self.Play_PauseBtn setImage:[UIImage imageNamed:@"playImg"] forState:UIControlStateNormal];

        [self.manager play];
    }
}

谢谢！

Answer 1

您好请检查已在info.plist中添加以下内容

Answer 2

您有以下代码

 case UIEventSubtypeRemoteControlPlay:
            [self Onclick_Play_Pause:self];
            break;

        case UIEventSubtypeRemoteControlPause:
            [self Onclick_Play_Pause:self];
             break;

        case UIEventSubtypeRemoteControlTogglePlayPause:

            //if ([self.manager.player isPlaying])
            if(self.manager.player.rate != 0)
            {
                [self.manager.player pause];
            }

            else {
                [self.manager.player play];
            }
            break;

在前两种情况下，您调用了方法，但在第三种情况下，您是否可以共享方法的定义？

Answer 3

- (IBAction)Onclick_Play_Pause:(id)sender {
     MPNowPlayingInfoCenter *center = [MPNowPlayingInfoCenter defaultCenter];
        NSMutableDictionary *playingInfo = [NSMutableDictionary dictionaryWithDictionary:center.nowPlayingInfo];
    (AppObj).playerview_height=playviewHeight;

    if(self.manager.player.rate != 0)
    {
        [MusicSetting set_SongStatus:@"Pause"];
        [self.Play_PauseBtn setImage:[UIImage imageNamed:@"pauseImg"] forState:UIControlStateNormal];
        [self.manager pause];
         //set playback rate
        [playingInfo setObject:[NSNumber numberWithFloat:0] forKey:MPNowPlayingInfoPropertyPlaybackRate];
    }
    else 
    {
        [MusicSetting set_SongStatus:@"Play"];
        [MusicSetting set_isMusicPlay:@"Playing"];

        [self.Play_PauseBtn setImage:[UIImage imageNamed:@"playImg"] forState:UIControlStateNormal];
        [self.manager play];
        //set playback rate
        [playingInfo setObject:[NSNumber numberWithFloat:1] forKey:MPNowPlayingInfoPropertyPlaybackRate];
    }
     center.nowPlayingInfo = playingInfo;

}