在init之前设置CustomView委托

Posted 2021-04-17

虽然我可以在我的CustomView类中创建一个func setImages ()并在初始化myCustomView之后调用它，但我想了解是否有更简洁的方法来设置视图的委托，以便在初始化时可以访问它。

我的主ViewController包含

class Main: UIViewController, CustomViewDelegate {

    var imagesArray:[UIImage] = [Image1,Image2,Image3,Image4,Image5]

    var myCustomView = CustomView()

    override func viewDidLoad() {
        super.viewDidLoad()

        myCustomView.delegate = self
        myCustomView = CustomView(frame: CGRect(x: 0, y: 0, width: 0, height: 0))
        //this causes init of CustomView, but delegate is now nil and button images don't load
    }
}

我的CustomView文件包含

var buttonsArray = [Button1,Button2,Button3,Button4,Button5]

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

    for n in 0..< buttonsArray.count {
        buttonsArray[n].setImage(delegate?.imagesArray[n], for: .normal)
    }
}

答案

您可以创建一个新的初始化程序，它采用框架和委托类型，并在将图像设置为按钮之前设置委托

 init(frame: CGRect,sender: CustomViewDelegate) {
    super.init(frame : frame)

    self.delegate = sender

    for n in 0..< buttonsArray.count {
       buttonsArray[n].setImage(delegate?.imagesArray[n], for: .normal)
    }
}

为此，你必须确认你的viewController为委托（显然）。在viewController中调用你的customView如下：

class ViewController: UIViewController, CustomViewDelegate {

    var myCustomView: CustomView!        

    override func viewDidLoad() {

       myCustomView = CustomView(frame: self.view.bounds, sender: self)
    }
}

希望能帮助到你！