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

Seems the bug in iOS7. At the time of input text content area behavior is wired in iOS7, It works fine with lower iOS7 version.

I have added below delegate method of UITextView to resolved this issue :

- (void)textViewDidChange:(UITextView *)textView {
CGRect line = [textView caretRectForPosition:
    textView.selectedTextRange.start];
CGFloat overflow = line.origin.y + line.size.height
    - ( textView.contentOffset.y + textView.bounds.size.height
    - textView.contentInset.bottom - textView.contentInset.top );
if ( overflow > 0 ) {
// We are at the bottom of the visible text and introduced a line feed, scroll down (iOS 7 does not do it)
// Scroll caret to visible area
    CGPoint offset = textView.contentOffset;
    offset.y += overflow + 7; // leave 7 pixels margin
// Cannot animate with setContentOffset:animated: or caret will not appear
    [UIView animateWithDuration:.2 animations:^{
        [textView setContentOffset:offset];
    }];
}