// textField 裡面輸入的字右移
extension UITextField{
    func moveLeft(){
        self.leftView = UIView.init(frame:CGRect(x: 0,y: 0,width: 5,height: 0))
        self.leftViewMode = .always
    }
}
xxxxTextField.moveLeft()


// 點擊空白處 收起鍵盤
@objc func viewTapped(gestureRecognizer: UITapGestureRecognizer){
    view.endEditing(true)
}