小编Li.*_*Rui的帖子

这里，str包含表情符号并且设置的光标位置不正确：

  let cursorPosition = str.characters.count
  let cursorRange = NSRange(location: cursorPosition, length: 0)
  textInputView.selectedRange = cursorRange
  textInputView.scrollRangeToVisible(cursorRange)