swift3.0键盘弹起遮挡输入框问题的解决方案

extension LoginViewController:UITextFieldDelegate{func textFieldShouldReturn(_ textField: UITextField) -> Bool {textField.resignFirstResponder()//键盘收回，view放下UIView.animate(withDuration: 0.4, animations: {self.view.frame.origin.y = 0})return true}func textFieldDidBeginEditing(_ textView:UITextField) {//view弹起跟随键盘，高可根据自己定义UIView.animate(withDuration: 0.4, animations: {self.view.frame.origin.y = -150})}}