我正在编程让iPhone音乐库显示，用户选择一首歌曲，然后这首歌的标题反射(reflect)在UILabel中。要是这么简单就好了!我尝试将 MPMediaItem 放入 NSString，然后将 UILabel 反射(reflect)这一点，但我只是返回 (null)!
- (IBAction)showMediaPicker:(id)sender {
MPMediaPickerController *mediaPicker = [[MPMediaPickerController alloc] initWithMediaTypes: MPMediaTypeAny];
mediaPicker.delegate = self;
//mediaPicker.allowsPickingMultipleItems = YES;
mediaPicker.prompt = @"Select Your Favourite Song!";
[self presentModalViewController:mediaPicker animated:YES];
}
- (void) mediaPicker: (MPMediaPickerController *) mediaPicker didPickMediaItems: (MPMediaItem *) mediaItemCollection {
NSString *titleString = [mediaItemCollection valueForProperty:MPMediaItemPropertyTitle];
titleLabel.text = [NSString stringWithFormat:@"Title: %@",titleString];
[self dismissModalViewControllerAnimated: YES];
}
提前致谢
最佳答案
您正在尝试获取 mediaItemCollection 的标题。您需要像这样获取单独的歌曲标题:
MPMediaItem *selectedSong = [mediaItemCollection items] objectAtIndex:0];
NSString *titleString = [selectedSong valueForProperty:MPMediaItemPropertyTitle];
另外，您的 MPMediaPickerControllerDelegate 委托(delegate)设置错误:
应该是:
- (void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection
-您将 MPMediaItemCollection 作为 MPMediaItem
关于ios - 为什么从 MPMediaPicker (iOS) 返回 (null)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14447099/