ios - 不同类中的 Swift 对象不更新

Question

我需要在我的变量重置的同时将步进器和标签重置回 0。问题是步进器和标签在不同的类中，并且在变量重置时不会重置。我尝试使用委托(delegate)(如果有人能告诉我最好的方法，那就太好了)而不是我的 View Controller 的实例，但我无法使任何东西工作。提前感谢您的帮助。

View Controller :

class ViewController: UIViewController 
{
var colors = CircleView()

@IBOutlet weak var circleView1: CircleView!
@IBOutlet weak var blueStepper: UIStepper!
@IBOutlet weak var greenStepper: UIStepper!
@IBOutlet weak var redStepper: UIStepper!

@IBAction func stepperChange(sender: UIStepper)
{
    circleView1.redd1 = Int(redStepper.value);
    redValue.text = Int(sender.value).description;
}
@IBAction func stepperChange1(sender: UIStepper)
{
    circleView1.greenn1 = Int(greenStepper.value);
    greenValue.text = Int(sender.value).description;
}
@IBAction func stepperChange2(sender: UIStepper)
{
    circleView1.bluee1 = Int(blueStepper.value);
    blueValue.text = Int(sender.value).description;
}
}

界面 View :

class CircleView: UIView 
{  
var colors1=ViewController()
func updateStepper
  {
    if(redd1==Int(red1)&&greenn1==Int(green1)&&bluee1==Int(blue1))
    {
        redd1=0;
        greenn1=0;
        bluee1=0;
        colors1.redStepper.value=0.0;//
        colors1.greenStepper.value=0.0;//
        colors1.blueStepper.value=0.0;//
    }
  }
}

Answer 1

我不太理解你的代码，比如你的 CircleView 中的“if”条件，方法“updateStepper”缺少参数。我假设你只是写了一些“swift-pseucode”，我会忽略它的某些部分来解释你如何为它实现一个委托(delegate)。下面是一个示例代码:

import UIKit

protocol CircleViewDelegate: class {
    func updateStepper(view: CircleView)
}


class ViewController: UIViewController, CircleViewDelegate{

    @IBOutlet weak var circleView1: CircleView!
    @IBOutlet weak var blueStepper: UIStepper!
    @IBOutlet weak var greenStepper: UIStepper!
    @IBOutlet weak var redStepper: UIStepper!

    var circleViewDelegate: CircleView!

    override func viewDidLoad() {
        super.viewDidLoad()
        circleViewDelegate = circleView1
        circleViewDelegate!.delegate = self
    }

    func updateStepper(view: CircleView) {
        //code you want to execute when you call updateStepper() in the CircleView()
    }

}

class CircleView: UIView {

    weak var delegate: CircleViewDelegate?

    func updateStepper() {
        //whenever you want your viewController to updated other views based
        //on a condition inside an element like UIView, you can use a delegate
        //this way, your code is executed by the ViewController whenever you want
        delegate?.updateStepper(self)
    }

}

您的 UIView 中的回调必须设置为在需要时调用“updateStepper”。不幸的是，根据你的问题，我不太明白应该调用它的时间。

希望对您有所帮助!