iOS 7中显示键盘时“调整大小”UITextView的问题 [英] Problems 'Resizing' UITextView when the Keyboard is Shown, in iOS 7

问题描述

我的目标只是iOS7。

我想在键盘输入时调整大小 UITextView 显示，以便可以看到所有文本，而不是隐藏在键盘后面。

我已经考虑了几种不同的方法...

1）当键盘显示时，更改 UITextView 的框架。

以下问题详述了我使用此方法时遇到的同样问题 - 尽管正确设置了帧，但最后一行/游标将超出的范围UITextView ，因此不在视线范围内：

With我的代码，当我更改 UIEdgeInsets 的底部组件时，我没有任何效果。

同样的例子如：上面，绿色 UITextView 红色 UIView ，文字消失在键盘下方：

这是代码：

   - （void）keyboardWillShow：（NSN otification *）通知
 {
 CGSize keyboardSize = [[[user userInfo] objectForKey：UIKeyboardFrameBeginUserInfoKey] CGRectValue] .size; 
 
 UIEdgeInsets insets = _textView.contentInset; 
 insets.bottom + = keyboardSize.height; 
 _textView.contentInset = insets; 
 _textView.scrollIndicatorInsets = insets; 
} 
  

注意： scrollIndicatorInsets part 正常工作。用屏幕截图很难描绘，但滚动指示器在正确的位置开始和停止并且看起来是正确的大小。

我读了一堆人们遇到类似问题的问题。

3）在<$ c上更改 textContainerInset $ c> UITextView

这个问题的答案建议使用 textContainerInset 而不是iOS 7上的 contentInset ：

UITextView contentInset在iOS 7上的UITextView中不起作用？

我也试过这个，但仍然无法调整 UITextView 的大小。

在这个问题上，'mann'也遇到了 contentInset 和 textContainerInset 的问题：

UITextView内容Inset Bottom无效iOS7

问题

• 这是正确/首选方法， textContainerInset 或 contentInset ？


• 在上面显示的代码中设置 contentInset ，我错过了什么？我还需要设置其他内容吗？


• 这些是iOS 7的错误吗？

谢谢

解决方案

这是iOS 7中的一个错误.Pete Stenberger用UITextView的子类解决了这个问题。你可以在这里找到它：

https：// github。 com / steipete / PSPDFTextView

以下是更多信息：

http://petersteinberger.com/blog/2014/fixing-uitextview-on-ios-7/

I'm targeting iOS7 only.

I want to 'resize' a UITextView when the keyboard is shown, so that all of the text can be seen, rather than being hidden behind the keyboard.

I've considered a few different approaches to this...

1) Change the frame of the UITextView when the keyboard shows.

The following question details the same problem that I have with this approach - despite the frame being set correctly, the last line/cursor will extend beyond the bounds of the UITextView, and therefore be out of sight:

UITextView cursor below frame when changing frame

You can see this effect from the following screen shot. The UITextView has a green background. It's been added to a UIView with a red background. The arrow shows where the cursor is...

2) Changing the contentInset property on the UITextView

I believe that this recommended/preferred approach. Note, I've read the Apple documentation for resizing views based on the keyboard appearing/disappearing:

https://developer.apple.com/library/ios/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/KeyboardManagement/KeyboardManagement.html#//apple_ref/doc/uid/TP40009542-CH5-SW7

With my code, I'm getting no effect when I change the bottom component of the UIEdgeInsets.

Same example as above, green UITextView on a red UIView, the text disappears underneath the keyboard:

And here's the code:

- (void)keyboardWillShow:(NSNotification*)notification
{
    CGSize keyboardSize = [[[notification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

    UIEdgeInsets insets = _textView.contentInset;
    insets.bottom += keyboardSize.height;
    _textView.contentInset = insets;
    _textView.scrollIndicatorInsets = insets;
}

Note: the scrollIndicatorInsets part works fine. It's hard to depict with a screen shot, but the scroll indicator starts and stops at the right place and appears to be the correct size.

I've read a bunch of questions where people have had a similar problem.

3) Changing the textContainerInset on the UITextView

The answer on this question suggests using textContainerInset instead of contentInset on iOS 7:

UITextView contentInset not working in UITextView on iOS 7?

I've tried this also, but still don't manage to resize the UITextView.

In this question, 'mann' is also having problems with both the contentInset and the textContainerInset:

UITextView content Inset Bottom not working iOS7

Questions

• which is the correct/preferred approach, textContainerInset or contentInset?
• in the code shown above for setting the contentInset, am I missing something? Is there something else I need to set?
• are these bugs with iOS 7?

Thanks

解决方案

It's a bug in iOS 7. Pete Stenberger solved this with a subclass of UITextView. You can find it here:

https://github.com/steipete/PSPDFTextView

Here's more info:

http://petersteinberger.com/blog/2014/fixing-uitextview-on-ios-7/

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