在iOS 7中显示键盘时“调整大小” UITextView问题

Question

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

Answer 1

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/