iOS7光标问题

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-(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];

        }];

    }

}