Question

我实现了MPMediaPickerController

- (IBAction)pickSong:(id)sender {
    MPMediaPickerController *picker =
    [[MPMediaPickerController alloc] initWithMediaTypes: MPMediaTypeMusic];

    picker.delegate                     = self;
    picker.allowsPickingMultipleItems   = NO;
    picker.prompt                       = NSLocalizedString (@"Select any song from the list", @"Prompt to user to choose some songs to play");
    picker.showsCloudItems = YES;

    [self presentModalViewController: picker animated: YES];
}
- (void) mediaPicker: (MPMediaPickerController *) mediaPicker didPickMediaItems: (MPMediaItemCollection *) mediaItemCollection
{
    [self dismissModalViewControllerAnimated: YES];
    if (mediaItemCollection.count > 0) {
        MPMediaItem *mediaItem = [mediaItemCollection.items objectAtIndex:0];
        NSLog(@"%@ - %@, %@", [mediaItem valueForProperty:MPMediaItemPropertyTitle], [mediaItem valueForProperty:MPMediaItemPropertyArtist], [mediaItem valueForProperty:MPMediaItemPropertyAssetURL]);


        self.fileURL = [mediaItem valueForProperty:MPMediaItemPropertyAssetURL];
    }
}

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

我还单独实现了UIDocumentInteractionController，以便能够在任何能够处理它的应用程序中打开一首歌

- (IBAction)shareButtonPressed:(id)sender {
    NSURL *url = [[NSBundle mainBundle] URLForResource:@"Song.mp3" withExtension:nil];
    self.docController= [UIDocumentInteractionController interactionControllerWithURL:url];
    [self.docController presentOpenInMenuFromRect:CGRectZero inView:self.view animated:YES];
}

现在我要做的是合并他们两个，我想分享从用户那里挑选的歌曲，这就是我保存歌曲的网址self.fileURL = [mediaItem valueForProperty:MPMediaItemPropertyAssetURL];，我做了一个简单的更改为分享方法

- (IBAction)shareButtonPressed:(id)sender {
    NSURL *url = self.fileURL;
    self.docController= [UIDocumentInteractionController interactionControllerWithURL:url];
    [self.docController presentOpenInMenuFromRect:CGRectZero inView:self.view animated:YES];
}

我认为这样可行，但我得到的却是错误的说法

*断言失败 - [UIDocumentInteractionController setURL：]，/ SourceCache / UIKit / UIKit-2903.23 / UIDocumentInteractionController.m：1010 2013-10-28 03：14：10.294 ShareTest [1567：60b] * 由于终止应用程序未捕获的异常'NSInternalInconsistencyException'，原因： 'UIDocumentInteractionController：无效的方案ipod-library。只要支持文件方案。'

问题显然是URL，我没有很好地实现它，或者我认为解决方案是采用MPMediaItem的NSData并将其保存为我的应用程序中的.mp3文件，但我不知道我也知道如何实现这个目标

提前谢谢

Answer 1

问题是您作为参数传递的URL类型。

您需要使用此方法：[NSURL fileURLWithPath:path]为UIDocumentInteractionController创建路径。

您创建的网址方案为ipod-library，但必须为file

如何在MPMediaPickerController中使用UIDocumentInteractionController

1 个答案: