Setting UITextView frame to content size no longer works in Xcode 5

Setting UITextView frame to content size no longer works in Xcode 5

The code snippet below worked to resize a UITextView frame to it's content
height, before installing Xcode 5 but it doesn't work since the upgrade:
CGRect frame = _textView.frame;
frame.size.height = _textView.contentSize.height;
_textView.frame = frame;
I've searched and haven't found the fix. Any thoughts?