ios - 如何在 swift 4 中禁用 otpscreen 中文本字段上光标的中间外观

Question

我有一个带有 6 个文本字段的 OTP 屏幕，当我点击特定的文本字段时，我需要光标不要移动到特定的文本字段。

我已经实现了自动将光标从一个文本字段移动到另一个文本字段的代码，但如果我触摸某个特定的文本字段(比如说第 4 个)，光标就会移动到那里。

请帮我解决这个问题，在此先感谢您。

我的 OTP 屏幕:

我的代码:

func setDelegateAndTargetForAllTextFields() {

    textField1.delegate = self
    textField2.delegate = self
    textField3.delegate = self
    textField4.delegate = self
    textField5.delegate = self
    textField6.delegate = self

    textField1.addTarget(self, action: #selector(textFieldDidChange(textField:)), for: UIControl.Event.editingChanged)
    textField2.addTarget(self, action: #selector(textFieldDidChange(textField:)), for: UIControl.Event.editingChanged)
    textField3.addTarget(self, action: #selector(textFieldDidChange(textField:)), for: UIControl.Event.editingChanged)
    textField4.addTarget(self, action: #selector(textFieldDidChange(textField:)), for: UIControl.Event.editingChanged)
    textField5.addTarget(self, action: #selector(textFieldDidChange(textField:)), for: UIControl.Event.editingChanged)
    textField6.addTarget(self, action: #selector(textFieldDidChange(textField:)), for: UIControl.Event.editingChanged)



}

@IBAction func otpBtnTapped(_ sender: UIButton) {

    if let text1 = textField1.text, let text2 = textField2.text, let text3 = textField3.text, let text4 = textField4.text,let text5 = textField5.text,let text6 = textField6.text {

        if text1+text2+text3+text4+text5+text6 == ""{

            showAlert(message: "Otp Cannot be empty!.")

            textField1.text = ""
            textField2.text = ""
            textField3.text = ""
            textField4.text = ""
            textField5.text = ""
            textField6.text = ""
            textFieldIntermediateEditingDisabled()

        }
        else{

            let setPinVC = self.storyboard?.instantiateViewController(withIdentifier: "pinVC") as! SetPinVC
            self.navigationController?.pushViewController(setPinVC, animated: true)




        }

    }

}

@objc func textFieldDidChange(textField: UITextField) {

    let text = textField.text

    if text?.count == 1 {

        switch textField{

        case textField1:
            //if textField2.isEnabled == false{
                //textField2.isEnabled = true
            //}
            textField2.becomeFirstResponder()
        case textField2:
            //if textField3.isEnabled == false{
               // textField3.isEnabled = true
           // }
            textField3.becomeFirstResponder()
        case textField3:
            //if textField4.isEnabled == false{
                //textField4.isEnabled = true
            //}
            textField4.becomeFirstResponder()
        case textField4:
            //if textField5.isEnabled == false{
                //textField5.isEnabled = true
            //}
            textField5.becomeFirstResponder()
        case textField5:
           // if textField6.isEnabled == false{
                //textField6.isEnabled = true
            //}
            textField6.becomeFirstResponder()
        default:
            break

        }

    }

    if text?.count == 0  {

        switch textField {

        case textField1:
            //if textField1.isEnabled == false{
                //textField1.isEnabled = true
            //}
            textField1.becomeFirstResponder()
        case textField2:
           // if textField1.isEnabled == false{
                //textField1.isEnabled = true
            //}
            textField1.becomeFirstResponder()
        case textField3:
            //if textField2.isEnabled == false{
                //textField2.isEnabled = true
            //}
            textField2.becomeFirstResponder()
        case textField4:
            //if textField3.isEnabled == false{
                //textField3.isEnabled = true
            //}
            textField3.becomeFirstResponder()
        case textField5:
            //if textField4.isEnabled == false{
               // textField4.isEnabled = true
            //}
            textField4.becomeFirstResponder()
        case textField6:
            //if textField5.isEnabled == false{
                //textField5.isEnabled = true
            //}
            textField5.becomeFirstResponder()
        default:
            break

        }
    }

}

func textFieldShouldReturn(_ textField: UITextField) -> Bool {

    textField.resignFirstResponder()

    return true

}


func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {


    let maxLength = 1
    let currentString: NSString = textField.text! as NSString
    let newString: NSString =
        currentString.replacingCharacters(in: range, with: string) as NSString
    return newString.length <= maxLength

}

Answer 1

您可以使用 textFieldShouldBeginEditing 来检查并允许/放弃 textField 开始像这样编辑

func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {         
    return true // edit the condition according to your requirement
}

编辑

如果你想检查并允许前一个文本字段是否有值，你可以做这样的事情，只需将所有文本字段放入一个数组中，顺序从一到等等

func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
    let textfields : [UITextField] = [textfield1,textfield2,textfield3] // just to demonstrate
    if (textField == textfield1) { return true }
    var previousTextfield : UITextField?
    for textfield in textfields{
        if let pTextfiled = previousTextfield,let value = pTextfiled.text{
            return value.isEmpty ? false : (textfield == textField)
        }
        previousTextfield = textfield
    }
    return false
}

Note: I didn't tested this code just added the answer according to the requirement let me know if this is what you wanted or something else.

谢谢。