blocks|key|1342472|text|您在info.plist中设置了媒体库的权限吗？NSAppleMusicUsageDescription|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1342473|entityMap^0|O|S|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

did you set the permission for the Media Library in your info.plist?
<code>NSAppleMusicUsageDescription</code>

blocks|key|2296343|text|苹果公司的Music应用程序似乎必须安装在该设备上。仍然没有100%25的可重复性，但是安装了那个应用程序，我再也没见过这个问题了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2296344|entityMap^0|5|5|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

It seems that the <code>Music</code> 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.

blocks|key|2274332|text|与早期的iOS+13版本不同，MPMediaPicker需要用户授权。因此，您需要先处理身份验证，然后在用户授予权限时向选择器显示。你的代码如下，|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2274333|MPMediaLibraryAuthorizationStatus+authorizationStatus+=+MPMediaLibrary.authorizationStatus;

++++switch+(authorizationStatus)
++++{
++++++++case+MPMediaLibraryAuthorizationStatusAuthorized:
++++++++{
++++++++++++[self+showPickerView];
++++++++++++break;
++++++++}
++++++++case+MPMediaLibraryAuthorizationStatusNotDetermined:
++++++++{
++++++++++++//+Not+yet+authorized+-+request+it+from+the+system
++++++++++++[MPMediaLibrary+requestAuthorization:%5E(MPMediaLibraryAuthorizationStatus+authorizationStatus)
+++++++++++++{
+++++++++++++++++if+(+authorizationStatus+==+MPMediaLibraryAuthorizationStatusAuthorized+)
+++++++++++++++++{
+++++++++++++++++++++dispatch_async(dispatch_get_main_queue(),+%5E{

++++++++++++++++++++++++++++[self+showPickerView];

++++++++++++++++++++++++});
+++++++++++++++++}
+++++++++++++++++else
+++++++++++++++++{
+++++++++++++++++++++PLog(@"The+Media+Library+was+not+authorized+by+the+user");

+++++++++++++++++}
+++++++++++++}];
++++++++++++break;
++++++++}

++++++++case+MPMediaLibraryAuthorizationStatusRestricted:
++++++++case+MPMediaLibraryAuthorizationStatusDenied:
++++++++{
++++++++++++//+user+has+previously+denied+access.+Ask+again+with+our+own+alert+that+is+similar+to+the+system+alert
++++++++++++//+then+take+them+to+the+System+Settings+so+they+can+turn+it+on+for+the+app

++++++++++++break;
++++++++}
++++}


-(void)showPickerView
{
++++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];
}|code-block|syntax|javascript|2274334|entityMap^0|4|6|F|D|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

From <code>iOS 13</code> <code>MPMediaPicker</code> required user authorization, unlike the earlier iOS version. So you need to handle the authentication first and then show the picker if user granted the permission. You code will be as follow,

<pre><code>MPMediaLibraryAuthorizationStatus authorizationStatus = MPMediaLibrary.authorizationStatus;

 switch (authorizationStatus)
 {
 case MPMediaLibraryAuthorizationStatusAuthorized:
 {
 [self showPickerView];
 break;
 }
 case MPMediaLibraryAuthorizationStatusNotDetermined:
 {
 // Not yet authorized - request it from the system
 [MPMediaLibrary requestAuthorization:^(MPMediaLibraryAuthorizationStatus authorizationStatus)
 {
 if ( authorizationStatus == MPMediaLibraryAuthorizationStatusAuthorized )
 {
 dispatch_async(dispatch_get_main_queue(), ^{

 [self showPickerView];

 });
 }
 else
 {
 PLog(@"The Media Library was not authorized by the user");

 }
 }];
 break;
 }

 case MPMediaLibraryAuthorizationStatusRestricted:
 case MPMediaLibraryAuthorizationStatusDenied:
 {
 // user has previously denied access. Ask again with our own alert that is similar to the system alert
 // then take them to the System Settings so they can turn it on for the app

 break;
 }
 }


-(void)showPickerView
{
 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];
}
</code></pre>

It seems that the general <code>MPMediaPicker</code> is not working anymore on ios13 (ipad air 2, iphone SE)
The example 1:1 copied from there is not showing up the media picker
<a href="https://developer.apple.com/documentation/mediaplayer/displaying_a_media_picker_from_your_app" rel="nofollow noreferrer">https://developer.apple.com/documentation/mediaplayer/displaying_a_media_picker_from_your_app</a>
Any tips how to get back functionality??
<h3>Note 1</h3>
When using using the <code>MPMediaPickerController</code> like this
<pre><code> 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(@&quot;Select a song&quot;, @&quot;Select a song&quot;);
 musicPicker.view.frame = musicPickerView.bounds;
 [self addChildViewController:musicPicker];
 [musicPickerView addSubview:musicPicker.view];
 [self.view addSubview:musicPickerView];
 [musicPicker didMoveToParentViewController:self];
 [self fadeInMusicPicker:true];
</code></pre>
The delegate is not invoked at all. No log is shown, only the native alert.
I am getting this native altert
<blockquote>
Internal Error
The requested app extension could not be found
[Cancel]
</blockquote>
<h3>Note 2</h3>
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?

iOS 13: MPMediaPickerController - Internal Error / The requested app extension could not be found

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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看来通用MPMediaPicker不再适用于ios13 (ipad 2，iphone )。从那里复制的示例1:1没有显示媒体选择器。关于如何恢复功能的提示？？注1在使用这样的MPMediaPickerController时    musicPickerView = [[UIView alloc] initWithFra...

问iOS 13: MPMediaPickerController -内部错误/无法找到所请求的应用程序扩展
EN

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问iOS 13: MPMediaPickerController -内部错误/无法找到所请求的应用程序扩展EN