在自定义uiview和自定义uicontrol之间设置代理（swift）

Question

import UIKit 

public class SelectionItem: UIView { 
var radioButtonController: SSRadioButtonsController 
var stepper: KWStepper! 

public init(){ 
let gcrRadioButton = SSRadioButton(frame: CGRect(x: 0, y: 100, width: 100, height: 50)) 
var decrementButton = UIButton(frame: CGRect(x: 400, y: 100, width: 50, height: 50)) 
var incrementButton = UIButton(frame: CGRect(x: 600, y: 100, width: 50, height: 50)) 
var countLabel = UILabel(frame: CGRect(x:500,y:100,width:50,height:50)) 
decrementButton.setImage(UIImage(named: "minus@2x.png"), forState: UIControlState.Normal) 
incrementButton.setImage(UIImage(named: "plus@2x.png"), forState: UIControlState.Normal) 
radioButtonController = SSRadioButtonsController(buttons: gcrRadioButton) 
stepper = KWStepper(decrementButton: decrementButton, incrementButton: incrementButton) 
stepper.delegate = self 
stepper.valueChangedCallback = { [unowned self] stepper in 
     countLabel.text = String(format: "%.f", stepper.value) 
    } 

    super.init(frame: CGRectZero) 
    self.addSubview(gcrRadioButton) 
    self.addSubview(decrementButton) 
    self.addSubview(incrementButton) 
} 

required public init?(coder aDecoder: NSCoder) { 
    fatalError("KWStepper: NSCoding is not supported!") 
} 

} 

问题：在stepper.delegate = self时发生错误。无法将类型SelectionItem的值分配给键入KWStepperDelegate。 KWStepper是一个定制的uicontrol类。我如何设置其中两个之间的代表团。

Answer 1

您将委托设置为self，但是由于书面自我未实施委托协议。它应该是：

public class SelectionItem: UIView, KWStepperDelegate 

然后您的SelectionItem必须实现委托协议。