Question

我正在编程以显示iPhone音乐库，用户选择一首歌曲，然后这首歌曲标题会反映在UILabel中。如果只是那么简单！我已尝试将MPMediaItem变为NSString，然后将UILabel反映出来，但我刚刚收到（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

Answer 1

您正在尝试获取mediaItemCollection的标题。你需要得到这样的单曲：

MPMediaItem *selectedSong = [mediaItemCollection items] objectAtIndex:0];
NSString *titleString = [selectedSong valueForProperty:MPMediaItemPropertyTitle];

顺便说一句，你的MPMediaPickerControllerDelegate设置了错误的委托：

应该是：

- (void)mediaPicker:(MPMediaPickerController *)mediaPicker didPickMediaItems:(MPMediaItemCollection *)mediaItemCollection

- 您将MPMediaItemCollection仅作为MPMediaItem

为什么从MPMediaPicker（iOS）返回（null）

1 个答案: