UITextView contentSize changes and NSLayoutManager in iOS7

Question

The problem: UITextView silently changes it\'s contentSize in some situations.

The simplest case textView with large text and keyboard. Just ad

Answer 1

Looks like the problem is in default layoutManager of UITextView. I've decided to subclass it and see, where and why re-layout being initiated. But simple creation of NSLayoutManager with default settings solved the problem.

Here is code (not perfect) from my demo project (see in question). The _textView there was an outlet, so I remove it from superview. This code is placed in - viewDidLoad:

NSTextStorage* textStorage = [[NSTextStorage alloc] initWithString:_textView.text];
NSLayoutManager* layoutManager = [NSLayoutManager new];
[textStorage addLayoutManager:layoutManager];
_textContainer = [[NSTextContainer alloc] initWithSize:self.view.bounds.size];
[layoutManager addTextContainer:_textContainer];
[_textView removeFromSuperview];    // remove original textView
_textView = [[MyTextView alloc] initWithFrame:self.view.bounds 
                                textContainer:_textContainer];
[self.view addSubview:_textView];

MyTextView here is a subclass of UITextView, see question for details.

For more info see:

• About Text Handling in iOS
• Using Text Kit to Draw and Manage Text
• NSLayoutManager Class Reference for iOS