iOS 13:MPMediaPickerController - 内部错误/找不到请求的应用程序扩展 [英] iOS 13: MPMediaPickerController - Internal Error / The requested app extension could not be found

问题描述

似乎一般的 MPMediaPicker 在 ios13 (ipad air 2, iphone SE) 上不再工作了

It seems that the general MPMediaPicker is not working anymore on ios13 (ipad air 2, iphone SE)

从那里复制的 1:1 示例没有显示媒体选择器https://developer.apple.com/documentation/mediaplayer/displaying_a_media_picker_from_your_app

The example 1:1 copied from there is not showing up the media picker https://developer.apple.com/documentation/mediaplayer/displaying_a_media_picker_from_your_app

任何提示如何恢复功能?

像这样使用MPMediaPickerController时

    musicPickerView = [[UIView alloc] initWithFrame:fullScreenRect];
    musicPickerView.alpha = 0.0f;
    musicPicker = [[MPMediaPickerController alloc] initWithMediaTypes:MPMediaTypeMusic];
    musicPicker.showsCloudItems               = false;
    musicPicker.showsItemsWithProtectedAssets = false;
    musicPicker.delegate                      = self;
    musicPicker.allowsPickingMultipleItems    = false;
    musicPicker.prompt                        = NSLocalizedString(@"Select a song", @"Select a song");
    musicPicker.view.frame                    = musicPickerView.bounds;
    [self addChildViewController:musicPicker];
    [musicPickerView addSubview:musicPicker.view];
    [self.view addSubview:musicPickerView];
    [musicPicker didMoveToParentViewController:self];
    [self fadeInMusicPicker:true];

委托根本没有被调用.不显示日志，仅显示本机警报.

The delegate is not invoked at all. No log is shown, only the native alert.

我得到了这个原生替代

内部错误

找不到请求的应用扩展

[取消]

注意事项 2

该设备上未安装 Apple 音乐应用程序时似乎是问题所在.有没有人知道一种可靠的方法来确定是否安装了苹果音乐应用?

Note 2

It seems to be the issue when the apple music app is not installed on that device. Does anybody know a reliable way to find out if apple music app is installed?

推荐答案

似乎必须在该设备上安装来自 Apple 的 Music 应用程序.仍然不是 100% 可重现，但安装该应用后，我再也没有遇到过这个问题.

It seems that the Music app from apple has to be installed on that device. Still not 100% reproducible, but with that app installed, I never saw that issue again.

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