what to use instead of scrollRangeToVisible in iOS7 or TextKit

Question

In previous versions of iOS, my UITextView will scroll to the bottom using

[displayText scrollRangeToVisible:NSMakeRange(0,[displayText.text length])];

or

CGFloat topCorrect = displayText.contentSize.height -[displayText bounds].size.height;
topCorrect = (topCorrect<0.0?0.0:topCorrect);
displayText.contentOffset = (CGPoint){.x=0, .y=topCorrect};

But the former will now have the weird effect of starting at the top of a long length of text and animating the scroll to the bottom each time I append text to the view. Is there a way to pop down to the bottom of the text when I add text?

Answer 1

textView.scrollEnabled = NO;
[textView scrollRangeToVisible:NSMakeRange(textView.text.length - 1,0)];
textView.scrollEnabled = YES;

This really works for me in iOS 7.1.2.

Answer 2

For future travelers, building off of @mikeho's post, I found something that worked wonders for me, but is a bit simpler.

1) Be sure your UITextView's contentInsets are properly set & your textView is already firstResponder() before doing this.
2) After my the insets are ready to go, and the cursor is active, I call the following function:

private func scrollToCursorPosition() {
    let caret = textView.caretRectForPosition(textView.selectedTextRange!.start)
    let keyboardTopBorder = textView.bounds.size.height - keyboardHeight!

   // Remember, the y-scale starts in the upper-left hand corner at "0", then gets
   // larger as you go down the screen from top-to-bottom. Therefore, the caret.origin.y
   // being larger than keyboardTopBorder indicates that the caret sits below the
   // keyboardTopBorder, and the textView needs to scroll to the position.
   if caret.origin.y > keyboardTopBorder {
        textView.scrollRectToVisible(caret, animated: true)
    }
 }

Answer 3

I believe this is a bug in iOS 7. Toggling scrollEnabled on the UITextView seems to fix it:

[displayText scrollRangeToVisible:NSMakeRange(0,[displayText.text length])];
displayText.scrollEnabled = NO;
displayText.scrollEnabled = YES;