我有一个 super 奇怪的问题。我正在使用iOS13 MPMediaPickerController
从用户Apple音乐库中获取一些歌曲,以便通过[MPMusicPlayerController applicationMusicPlayer]
播放它。
现在,从我添加到库中的一些播放列表中下载了一些未下载的歌曲后,委托函数
- (void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection
回报
mediaItemCollection.items.firstObject
播放器无法播放的
MPModelObjectMediaItem
类型的对象。 (我也不能转换为该类型,因为它是未知的。也没有关于该类型的文档。它似乎是mediaplayer框架内的一个 private 类。)我期望所有下载的(以及不在播放列表中的所有其他云项目)传入的
MPConcreteMediaItem
类型选择器的配置如下
musicPicker = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeMusic];
musicPicker.showsCloudItems = true;
musicPicker.showsItemsWithProtectedAssets = true;
musicPicker.delegate = self;
musicPicker.allowsPickingMultipleItems = false;
有什么提示吗?
最佳答案
好吧,如果您尚未将加载到自己的应用程序中的项目添加到音乐库中,则似乎无法正确加载。 (iOS13.3)
我正在使用此解决方法:
- (void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection
{
assert(mediaItemCollection.count == 1);
// this check is done because it seems that in the following scenario you dont get a
// MPConcreteMediaItem which can be played. Instead you get a MPModelObjectMediaItem
// this happens when an item was selected that is inside a playlist, but does not belong
// to your library (nor is it downloaded to your device)
if(mediaItemCollection.items.firstObject.persistentID <= 0)
{
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Song Not Added")
message:@"This song must be added to your Apple Music library. Please add the song to your library from the Music App."
preferredStyle:UIAlertControllerStyleAlert];
[alertController addAction:[UIAlertAction actionWithTitle:@"Dismiss"
style:UIAlertActionStyleDefault
handler:nil]];
[alertController addAction:[UIAlertAction actionWithTitle:@"Open Music App"
style:UIAlertActionStyleCancel
handler:^(UIAlertAction *alertAction)
{
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"music://"]
options:nil
completionHandler:nil];
}]];
[self presentViewController:alertController animated:true completion:nil];
return;
}
// good to go? then load it
[musicPlayer setQueueWithItemCollection:mediaItemCollection];
...
}