TextFieldHandler

class TextFieldHandler {
    
    var handlers: [UITextField: (String) -> Void] = [:]
    
    func bind(textField: UITextField, handler: @escaping (String) -> Void) {
        textField.addTarget(self, action: #selector(textFieldChanged), for: .editingChanged)
        
        self.handlers[textField] = handler
    }
    
    @objc func textFieldChanged(textField: UITextField) {
        self.handlers[textField]?(textField.text ?? "")
    }
}