CODEWITHSUNDEEP
iosswiftuitextfielduitextfielddelegate
Muhammad Wasim
Muhammad Wasim

Reputation: 61

Delegate methods not calling in UITextField custom subclass

I am creating a custom subclass from UITextField class. I want to apply something while textfield is focused. But in my custom class my delegate methods are not calling.

I have create a subclass that extends UITextField class and make some customisation.

In TGTextField class:

class TGTextField: UITextField, UITextFieldDelegate {

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)!
    delegate = self
    createBorder()
}
required override init(frame: CGRect) {
    super.init(frame: frame)
    delegate = self
    createBorder()
}
func createBorder(){
    self.layer.borderColor = AppColor.TextFieldColors.BorderNormalColor.cgColor
    self.layer.borderWidth = 1.0;
    self.layer.cornerRadius = 8
}

func textFieldDidBeginEditing(textField: UITextField) {
    print("focused")
    self.activeTextFieldColor()
}
func textFieldDidEndEditing(textField: UITextField) {
    print("lost focus")
     self.deactiveTextFieldColor()
}

func activeTextFieldColor(){
    self.layer.borderColor = AppColor.TextFieldColors.BorderActiveColor.cgColor
}
func deactiveTextFieldColor(){
    self.layer.borderColor = AppColor.TextFieldColors.BorderNormalColor.cgColor
}
}

Both these delegates methods are not called. 

func textFieldDidBeginEditing(textField: UITextField) {
    print("focused")
    self.activeTextFieldColor()
}
func textFieldDidEndEditing(textField: UITextField) {
    print("lost focus")
     self.deactiveTextFieldColor()
}

Upvotes: 1

Views: 2530

Answers (2)

RajeshKumar R
RajeshKumar R

Reputation: 15748

Your code works for me. These delegate methods in the custom class won't be called if you set text field delegate to the corresponding view controller after you've initialized the text fields.

To avoid this add target in TGTextField instead of UITextFieldDelegate

class TGTextField: UITextField {

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)!
        //delegate = self
        createBorder()
    }
    required override init(frame: CGRect) {
        super.init(frame: frame)
        //delegate = self
        createBorder()
    }
    func createBorder(){
        self.layer.borderColor = UIColor.red.cgColor
        self.layer.borderWidth = 1.0;
        self.layer.cornerRadius = 8
        addTarget(self, action: #selector(activeTextFieldColor), for: .editingDidBegin)
        addTarget(self, action: #selector(deactiveTextFieldColor), for: .editingDidEnd)
    }
    @objc func activeTextFieldColor(){
        self.layer.borderColor = UIColor.green.cgColor
    }
    @objc func deactiveTextFieldColor(){
        self.layer.borderColor = UIColor.red.cgColor
    }
}

Upvotes: 4

Rico Crescenzio
Rico Crescenzio

Reputation: 4226

Looks like you're implementing the wrong method signature; you should put _ before textField, like this

func textFieldDidBeginEditing(_ textField: UITextField) {}
func textFieldDidEndEditing(_ textField: UITextField) {}

Xcode should help you highlighting with a warning

Instance method 'textFieldDidBeginEditing(textField:)' nearly matches optional requirement 'textFieldDidBeginEditing' of protocol 'UITextFieldDelegate'

Upvotes: 1

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