如何显示所选歌曲从ipodLibrary从avplayer中扮演的UITableView(how t

我用AVPlayer播放歌曲。我可以在后台播放它。有一个UIButton叫showPlaylist 。当我在敲打我需要显示的我从所选歌曲列表ipodLibrary在UITableView ，我应该能够显示艺术品，剩余的歌曲和歌手的名字分钟数，如果它是在歌曲可用。

我有播放和暂停按钮：当我点击暂停按钮，歌曲暂停，但是当我再次上的播放按钮点击，这是不言而喻的ipodLibrary。如何恢复播放，当我上的播放按钮点击？

当有多个歌曲在UITableView ，我希望它尽快的第一首曲目结束继续到下一首曲目。我不知道该怎么做。

-(IBAction)playButtonPressed:(UIButton *)sender {
  // Create picker view
  MPMediaPickerController* picker = [[MPMediaPickerController alloc] init];
  picker.delegate = self;
  if (userMediaItemCollection) {
    MusicTableViewController *controller = [[MusicTableViewController alloc]
     initWithNibName: @"MusicTableView" bundle: nil];
    controller.delegate = self;
    controller.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    [self presentModalViewController: controller animated: YES];
  } else {
    MPMediaPickerController *picker = [[MPMediaPickerController alloc]
      initWithMediaTypes: MPMediaTypeMusic];
    picker.delegate  = self;
    picker.allowsPickingMultipleItems = YES;
    picker.prompt = NSLocalizedString
      (@"Add songs to play", "Prompt in media item picker");
    [[UIApplication sharedApplication] setStatusBarStyle:
      UIStatusBarStyleDefault animated: YES];
    [self presentModalViewController: picker animated: YES];
  }
}

-(IBAction)pauseButtonPressed:(UIButton *)sender {
  [myPlayer pause];
}

-(void) mediaPickerDidCancel:(MPMediaPickerController *)mediaPicker {
  [self dismissViewControllerAnimated:YES completion:nil];
}

-(void) mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:
  (MPMediaItemCollection *)mediaItemCollection {
  [self dismissViewControllerAnimated:YES completion:nil];
  NSURL* assetUrl = [mediaItemCollection.representativeItem
    valueForProperty:MPMediaItemPropertyAssetURL];
  AVURLAsset* asset = [AVURLAsset URLAssetWithURL:assetUrl options:nil];
  AVPlayerItem* playerItem = [AVPlayerItem playerItemWithAsset:asset];
  myPlayer = [AVPlayer playerWithPlayerItem:playerItem];
  [myPlayer play];
}

- (void)viewDidAppear:(BOOL)animated {
  [super viewDidAppear:animated];
  [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
  [self becomeFirstResponder];
}

- (BOOL)canBecomeFirstResponder {
  return YES;
}

- (void)viewWillDisappear:(BOOL)animated {
  [super viewWillDisappear:animated];
  [[UIApplication sharedApplication] endReceivingRemoteControlEvents];
  [self resignFirstResponder];
}

-(void)remoteControlReceivedWithEvent:(UIEvent *)event {
  switch (event.subtype) {
    case UIEventSubtypeRemoteControlTogglePlayPause:
      if (myPlayer.rate == 0.0) {
        [myPlayer play];
      } else {
        [myPlayer pause];
      }
      break;
    case UIEventSubtypeRemoteControlPlay:
      [myPlayer play];
      break;
    case UIEventSubtypeRemoteControlPause:
      [myPlayer pause];
      break;
    default:
      break;
  }
}

Answer 1:

我会去了解一下苹果的示例代码“添加音乐”这清楚地表明该怎么做你所描述的一切。

这个示例应用程序运行时，您通过插件和填充一个出局UITableView与从保存到了iPod库中选择歌曲的可变副本内容MPMediaItemCollection 。它还说明了如何使用MPMediaItems和MPMediaItemCollections可以显示跟踪特定属性的细胞标题标签等

用于填充表视图，您可以将其设置是这样的：

MPMediaItem *mediaItem = (MPMediaItem *)[collectionMutableCopy objectAtIndex:row];

MPMediaItemArtwork *artwork = [mediaItem valueForProperty:MPMediaItemPropertyArtwork];

 if (mediaItem) { cell.textLabel.text = [mediaItem valueForProperty:MPMediaItemPropertyTitle]; cell.detailTextLabel.text = [mediaItem valueForProperty:MPMediaItemPropertyArtist]; if (artwork != nil) { cell.imageView.image = [artwork imageWithSize:CGSizeMake (40, 40)]; }else{ cell.imageView.image = [UIImage imageNamed:@"no_artwork.png"]; } }

重命名连接到播放按钮“选择音乐”按钮，创建一个名为“播放”按钮，新其行动设置为：
- (IBAction)playMusic { [myPlayer play]; }

编辑：从创建内容阵列MPMediaItemCollection ：

NSMutableArray *collectionMutableCopy = [[NSMutableArray alloc] initWithArray:myMediaItemCollection.items];

编辑2：取消该项目下面几行：

在- (void) registerForMediaPlayerNotifications

/*
 // This sample doesn't use libray change notifications; this code is here to show how
 //     it's done if you need it.
 [[NSNotificationCenter defaultCenter] removeObserver: self
 name: MPMediaLibraryDidChangeNotification
 object: musicPlayer];

 [[MPMediaLibrary defaultMediaLibrary] endGeneratingLibraryChangeNotifications];

 */

在- (void)dealloc

/*
 // This sample doesn't use libray change notifications; this code is here to show how
 //     it's done if you need it.
 [notificationCenter addObserver: self
 selector: @selector (handle_iPodLibraryChanged:)
 name: MPMediaLibraryDidChangeNotification
 object: musicPlayer];

 [[MPMediaLibrary defaultMediaLibrary] beginGeneratingLibraryChangeNotifications];
 */

替换此行：

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

有了这个

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

 UInt32 doSetProperty = 0;
 AudioSessionSetProperty (
 kAudioSessionProperty_OverrideCategoryMixWithOthers,
 sizeof (doSetProperty),
 &doSetProperty
 );

那么下面添加到您的项目Info.plist文件