Ios MPMediaPickerController didPickMediaItems返回MPModelObjectMediaItem
我有一个非常奇怪的问题。我正在使用iOS13Ios MPMediaPickerController didPickMediaItems返回MPModelObjectMediaItem,ios,iphone,mpmediaitem,mpmediapickercontroller,mpmediaplayercontroller,Ios,Iphone,Mpmediaitem,Mpmediapickercontroller,Mpmediaplayercontroller,我有一个非常奇怪的问题。我正在使用iOS13MPMediaPickerController从用户的苹果音乐库中获取一些歌曲,以便通过[MPMusicPlayerController applicationMusicPlayer]播放 现在,我将一些播放列表中的未下载歌曲添加到我的音乐库中,并使用委派功能 - (void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollecti
MPMediaPickerController
从用户的苹果音乐库中获取一些歌曲,以便通过[MPMusicPlayerController applicationMusicPlayer]
播放
现在,我将一些播放列表中的未下载歌曲添加到我的音乐库中,并使用委派功能
- (void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection
回报
mediaItemCollection.items.firstObject
播放器无法播放的类型为MPModelObjectMediaItem
的对象。(我也不能强制转换到该类型,因为它是未知的。此外,没有关于该类型的文档。它似乎是mediaplayer框架内的私有类。)
我希望所有下载的内容(以及不在播放列表中的所有其他云项目)都会收到类型为MPMediaItem
选择器的配置如下所示
musicPicker = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeMusic];
musicPicker.showsCloudItems = true;
musicPicker.showsItemsWithProtectedAssets = true;
musicPicker.delegate = self;
musicPicker.allowsPickingMultipleItems = false;
有什么提示吗?好吧,如果您没有将加载到自己的应用程序中的项目添加到音乐库中,它们似乎无法正确加载。(13.3) 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];
...
}
-(void)mediaPicker:(MPMediaPickerController*)mediaPicker didPickMediaItems:(MPMediaItemCollection*)mediaItemCollection
{
断言(mediaItemCollection.count==1);
//完成此检查是因为在以下场景中,您似乎没有得到
//可以播放的MPModelObjectMediaItem。取而代之的是MPModelObjectMediaItem
//当选择的项目位于播放列表中但不属于该项目时,会发生这种情况
//到您的库(也不会下载到您的设备)
在这两种情况下,如果使用isKindOfClass
检查MPMediaItem
时返回(mediaItemCollection.items.firstObject.persistentID