iOS音乐后台播放及锁屏信息显示

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

- (void)viewDidLoad {  [super viewDidLoad];//  设置后台播放  [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];//  设置播放器  NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"那些花儿" ofType:@"mp3"] ];  _player = [[AVPlayer alloc] initWithURL:url];  [_player play];  _isPlayingNow = YES;  //后台播放显示信息设置  [self setPlayingInfo];}#pragma mark - 接收方法的设置- (void)remoteControlReceivedWithEvent:(UIEvent *)event {  if (event.type == UIEventTypeRemoteControl) { //判断是否为远程控制    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;    }  }}

- (void)setPlayingInfo {//  <MediaPlayer/MediaPlayer.h>  MPMediaItemArtwork *artWork = [[MPMediaItemArtwork alloc] initWithImage:[UIImage imageNamed:@"pushu.jpg"]];  NSDictionary *dic = @{MPMediaItemPropertyTitle:@"那些花儿",             MPMediaItemPropertyArtist:@"朴树",             MPMediaItemPropertyArtwork:artWork             };  [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:dic];}

- (void)viewDidAppear:(BOOL)animated {//  接受远程控制  [self becomeFirstResponder];  [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];}- (void)viewDidDisappear:(BOOL)animated {//  取消远程控制  [self resignFirstResponder];  [[UIApplication sharedApplication] endReceivingRemoteControlEvents];}