blocks|key|657074|text|在呈现活动视图控制器后添加以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|657075|if+([activityVC+respondsToSelector:@selector(popoverPresentationController)])
{
++++//+iOS+8%2B
++++UIPopoverPresentationController+*presentationController+=+[activityVC+popoverPresentationController];

++++presentationController.sourceView+=+sender;+//+if+button+or+change+to+self.view.
}|code-block|syntax|javascript|657076|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Add this code after you present your activity view controller:

<pre><code>if ([activityVC respondsToSelector:@selector(popoverPresentationController)])
{
 // iOS 8+
 UIPopoverPresentationController *presentationController = [activityVC popoverPresentationController];

 presentationController.sourceView = sender; // if button or change to self.view.
}
</code></pre>

blocks|key|655942|text|查看开发者论坛：“日志消息并不表示您有任何错误。”|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|655943|entityMap|0|LINK|mutability|MUTABLE|url|https://devforums.apple.com/message/1049415#1049415^0|2|5|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Looking at the <a href="https://devforums.apple.com/message/1049415#1049415" rel="nofollow">developer forums</a>: "That log message does not indicate any error on your part."

blocks|key|655953|text|我对UIDocumentInteractionController也有类似的问题，当我点击外部关闭它，或者选择另一个应用程序打开文档时，它会与"LaunchServices:+invalideationHandler调用“控制台消息崩溃两次(仅使用iOS+8)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|655954|解决方法是将对presentOpenInMenuFromRect:inView:animated的调用添加到主队列中，即|offset|length|style|CODE|655955|dispatch_async(dispatch_get_main_queue(),+%5E()+{

[self.documentInteraction+presentOpenInMenuFromRect:theRect+inView:self.view+animated:YES];

});|code-block|syntax|javascript|655956|entityMap^0|0|7|15|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I had a similar problem with a UIDocumentInteractionController, where when I tapped outside it to dismiss it, or selected another app to open the document in, it would crash with the "LaunchServices: invalideationHandler called" console message displayed twice (only using iOS 8).

A workaround is to add the call to <code>presentOpenInMenuFromRect:inView:animated</code> to the main queue, i.e.

<pre><code>dispatch_async(dispatch_get_main_queue(), ^() {

[self.documentInteraction presentOpenInMenuFromRect:theRect inView:self.view animated:YES];

});
</code></pre>

blocks|key|396917|text|您还可能需要定义sourceRect。我使用以下代码显示来自SLComposeViewController的tableView。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|396918|if+([controller+respondsToSelector:@selector(popoverPresentationController)])+{
++++//get+rect+for+this+row+in+table
++++CGRect+frame+=+[self.tableView+rectForRowAtIndexPath:indexPath];

++++//convert+table+row+frame+to+view+reference
++++CGRect+frameInView+=+[self.tableView+convertRect:frame+toView:self.view];

++++[controller+popoverPresentationController].sourceRect+=+frameInView;
++++[controller+popoverPresentationController].sourceView+=+self.view;
}|code-block|syntax|javascript|396919|entityMap^0|8|A|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You may also need to define the <code>sourceRect</code>. I used the following code to display a SLComposeViewController from a tableView.

<pre><code>if ([controller respondsToSelector:@selector(popoverPresentationController)]) {
 //get rect for this row in table
 CGRect frame = [self.tableView rectForRowAtIndexPath:indexPath];

 //convert table row frame to view reference
 CGRect frameInView = [self.tableView convertRect:frame toView:self.view];

 [controller popoverPresentationController].sourceRect = frameInView;
 [controller popoverPresentationController].sourceView = self.view;
}
</code></pre>

blocks|key|396927|text|关于自动关闭(而不是崩溃)：我认为这可能与你试图分享的链接有关。在尝试发布音乐链接(Spotify，SoundCloud，.)时，我也看到了同样的情况。如果我用一些非媒体内容的链接代替这个链接，同样的推特也会奏效。我会用雷达检查这是否是故意的.|type|unstyled|depth|inlineStyleRanges|entityRanges|data|396928|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Regarding the auto-closing (not the crash):
I think it's probably related to the link you are trying to share. I'm seeing the same thing when trying to post music links (Spotify, SoundCloud,...). The same tweet works if I replace the link by a link to some non-media-content. I'll file radar on this to see whether it's intentional...

blocks|key|657147|text|这将消除我的错误信息，并按预期的方式工作。您必须去掉调用"isAvailableForServiceType:“的if语句。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|657148|应该是这样的。编码愉快。|657149|++++SLComposeViewController+*tweetSheet+=+[SLComposeViewController
+++++++++++++++++++++++++++++++++++++++++++composeViewControllerForServiceType:SLServiceTypeTwitter];

++++[tweetSheet+setInitialText:@"Great+fun+to+learn+iOS+programming+at+appcoda.com!"];
++++[self+presentViewController:tweetSheet+animated:YES+completion:nil];

++++if+([tweetSheet+respondsToSelector:@selector(popoverPresentationController)])
++++{
++++++++//+iOS+8%2B
++++++++UIPopoverPresentationController+*presentationController+=+[tweetSheet+popoverPresentationController];

++++++++presentationController.sourceView+=+sender;+//+if+button+or+change+to+self.view.
++++}|code-block|syntax|javascript|657150|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This gets rid of the Error message for me and works as expected. You have to get rid of the if statement that calls "isAvailableForServiceType:"

It should look like this. Happy coding. 

<pre><code> SLComposeViewController *tweetSheet = [SLComposeViewController
 composeViewControllerForServiceType:SLServiceTypeTwitter];

 [tweetSheet setInitialText:@"Great fun to learn iOS programming at appcoda.com!"];
 [self presentViewController:tweetSheet animated:YES completion:nil];

 if ([tweetSheet respondsToSelector:@selector(popoverPresentationController)])
 {
 // iOS 8+
 UIPopoverPresentationController *presentationController = [tweetSheet popoverPresentationController];

 presentationController.sourceView = sender; // if button or change to self.view.
 }
</code></pre>

Seeing this error message in the logs, though not consistently, around the time that I use <code>SLComposeViewController</code> to open a Twitter or Facebook share sheet. I am not using any new iOS 8 API, just testing existing code on iOS 8. I see others have had this problem and even seen crashes when using other modal view controllers from the Cocoa Touch SDK.

<blockquote>
 LaunchServices: invalidationHandler called
</blockquote>

Are there new precautions to take with <code>SLComposeViewController</code> and <code>UIActivityViewController</code> in iOS 8? Something else to consider?

LaunchServices: invalidationHandler called - iOS 8 share sheet

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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在我使用SLComposeViewController打开Twitter或Facebook共享表的时候，在日志中看到了这条错误消息，尽管不一致。我没有使用任何新的iOS 8 API，只是在Cocoa 8上测试现有的代码。我看到其他人在使用Cocoa的其他模态视图控制器时也遇到了这个问题，甚至看到过崩溃。LaunchServices: invalidationHandler调用SLComposeVi

问LaunchServices: invalidationHandler调用- iOS 8股票
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