ios – MPNowPlayingInfoCenter播放暂停图像不会改变

概述我正在使用下面的代码.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.每次断点都是广告,在这种情况下UIEventSubtypeRemoteControlPause：case. albumArt= [[MPMediaItemArtwork alloc] initWithImage: img.image]; 我正在使用下面的代码.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.每次断点都是广告,在这种情况下UIEventSubtypeRemoteControlPause：case.

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！

解决方法

- (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;}

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