iOS7UITextView光标问题

 1 -(void)textViewDidChange:(UITextView *)textView { 2     CGRect line = [textView caretRectForPosition: 3                    textView.selectedTextRange.start]; 4     CGFloat overflow = line.origin.y + line.size.height 5     - ( textView.contentOffset.y + textView.bounds.size.height 6        - textView.contentInset.bottom - textView.contentInset.top ); 7     if ( overflow > 0 ) { 8         // We are at the bottom of the visible text and introduced a line feed, scroll down (iOS 7 does not do it) 9         // Scroll caret to visible area10         CGPoint offset = textView.contentOffset;11         offset.y += overflow + 7; // leave 7 pixels margin12         // Cannot animate with setContentOffset:animated: or caret will not appear13         [UIView animateWithDuration:.2 animations:^{14             [textView setContentOffset:offset];15         }];16     }17 }