ios - 未调用自定义 UITextField 委托(delegate)方法 shouldChangeCharactersIn

Question

在我的自定义 UITextField 中，textFieldDidBeginEditing() 和 textFieldDidEndEditing() 委托(delegate)方法被调用但是func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> bool

@IBDesignable class CustomUITextField: UITextField, UITextFieldDelegate{

   //getting Called
   @objc func textFieldDidBeginEditing() {

    }

   //getting Called
    @objc func textFieldDidEndEditing(){

    }

    //Not getting Called
    @objc func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

    }

}

我不知道为什么没有接到电话。为此需要做任何额外的工作吗？

提前致谢。

Answer 1

你需要设置委托(delegate)

@IBDesignable class CustomUITextField: UITextField, UITextFieldDelegate{

    override init(frame: CGRect) {
        super.init(frame: frame)

        self.delegate = self
    }

    required init?(coder aDecoder: NSCoder) {

        super.init(coder: aDecoder)

          self.delegate = self
    }

    //getting Called
    @objc func textFieldDidBeginEditing() {

        print("textFieldDidBeginEditing")
    }

    //getting Called
    @objc func textFieldDidEndEditing(){

        print("textFieldDidEndEditing")
    }

    //Not getting Called
    @objc func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {

        print("shouldChangeCharactersIn")

        return true

    }

}