代码
_scroll.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
_tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
_scroll.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
_tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;