通过点击事件实现关闭键盘
scrollView: UIScrollView!
title_textField: UITextField!
let hideKeyboardTapGesture = UITapGestureRecognizer(target: self, action: #selector(hideKeyboardTapGesture(sender:)))
scrollView.isUserInteractionEnabled = true
scrollView.addGestureRecognizer(hideKeyboardTapGesture)
关闭实现
func hideKeyboardTapGesture(sender: UITapGestureRecognizer){
title_textField.resignFirstResponder()
}