MFMessageComposeViewController后没有显示键盘(Keyboard not showing after MFMessageComposeViewController)

 在iPhone应用程序中，我有一个UITextView和一个按钮，它允许用户将UITextView的内容作为文本消息发送。 代码如下所示： 
 
MFMessageComposeViewController *picker = [[MFMessageComposeViewController alloc] init];
picker.messageComposeDelegate = self;

picker.body = textView.text;

[self presentModalViewController:picker animated:YES];
 
 一切工作正常，除了消息发送时或在MFMessageComposer点击Cancel时： 即使光标闪烁， UITextView的键盘也不再显示 。 
 
 我尝试了一些东西，包括按钮代码和-viewDidDisappear的[textView resignFirstRepsonder] 。 MFMessageComposeViewControllerDelegate方法中的[textView becomeFirstResponder]或-viewDidAppear不会更改任何内容... 
 
 有任何想法吗？ 

In an iPhone app I have a UITextView and a button, which lets the user send the content of the UITextView as a text message. The code looks like this:
 
MFMessageComposeViewController *picker = [[MFMessageComposeViewController alloc] init];
picker.messageComposeDelegate = self;

picker.body = textView.text;

[self presentModalViewController:picker animated:YES];
 
Everything works fine, except for when the message is either sent or Cancel is tapped in the MFMessageComposer: The keyboard for the UITextView is not shown anymore, even though the cursor blinks.
 
I tried a few things, including a [textView resignFirstRepsonder] in both the button code and -viewDidDisappear. [textView becomeFirstResponder] in the MFMessageComposeViewControllerDelegate method or the -viewDidAppear didn't change anything either...
 
Any ideas?

原文：https://stackoverflow.com/questions/4768425