實現音樂的後臺播放。以及播放時，能夠控制其暫停，下一首等操作，以及鎖屏圖片歌曲名等的顯示
此實例須要真機調試。效果圖例如以下：

project下載：githubproject下載

實現步驟：
1、首先改動info.plist

2、其次引入兩個須要的框架

#import <AVFoundation/AVFoundation.h>
#import <MediaPlayer/MediaPlayer.h>

3、設置播放器及後臺播放

- (void)viewDidLoad {
    [super viewDidLoad];
//    設置後臺播放
 

    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];

//    設置播放器
    NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"那些花兒" ofType:@"mp3"] ];
    _player = [[AVPlayer alloc] initWithURL:url];
    [_player play];
    _isPlayingNow = YES
 
;

    //後臺播放顯示信息設置
    [self setPlayingInfo];
}

#pragma mark - 接收方法的設置
- (void)remoteControlReceivedWithEvent:(UIEvent *)event {
    if (event.type == UIEventTypeRemoteControl) {  //推斷是否為遠程控制
        switch (event.subtype) {
            case  UIEventSubtypeRemoteControlPlay:
                if (!_isPlayingNow) {
                    [_player play];
                }
                _isPlayingNow = !_isPlayingNow;
                break
 
;
            case UIEventSubtypeRemoteControlPause:
                if (_isPlayingNow) {
                    [_player pause];
                }
                _isPlayingNow = !_isPlayingNow;
                break;
            case UIEventSubtypeRemoteControlNextTrack:
                NSLog(@"下一首");
                break;
            case UIEventSubtypeRemoteControlPreviousTrack:
                NSLog(@"上一首 ");
                break;
            default:
                break;
        }
    }
}

4、設置後臺播放時顯示的東西，比如歌曲名字。圖片等

- (void)setPlayingInfo {
//    <MediaPlayer/MediaPlayer.h>
    MPMediaItemArtwork *artWork = [[MPMediaItemArtwork alloc] initWithImage:[UIImage imageNamed:@"pushu.jpg"]];

    NSDictionary *dic = @{MPMediaItemPropertyTitle:@"那些花兒",
                          MPMediaItemPropertyArtist:@"樸樹",
                          MPMediaItemPropertyArtwork:artWork
                          };
    [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:dic];
}

5、遠程控制設置

- (void)viewDidAppear:(BOOL)animated {
//    接受遠程控制
    [self becomeFirstResponder];
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
}

- (void)viewDidDisappear:(BOOL)animated {
//    取消遠程控制
    [self resignFirstResponder];
    [[UIApplication sharedApplication] endReceivingRemoteControlEvents];
}

iOS音樂後臺播放及鎖屏信息顯示