我开始学习Swift，并决定构建一个没有故事板的应用程序。

我的SceneDelegate scene函数实例化一个TabBarController

window = UIWindow(frame: UIScreen.main.bounds)
let tb = TabBarController()

window?.rootViewController = tb
window?.makeKeyAndVisible()
window?.windowScene = windowSceme

我有一个从UITabBarController扩展的TabBarController，它几乎对标签栏进行样式设置并将其全部设置

对于标签栏的每个项目，我都有一个ViewController。出于这个问题的目的，我将指定第一个“主页”。

在扩展ViewController的Home中，我有以下内容

let homePageView = HomePageView()
override func viewWillLayoutSubviews() {
   navigationController?.isnavigationBarHidden = true
}

override func viewDidAppear(_ animated: Bool) {
   super.viewDidAppear(true)
   homePageView.setupHomePage()
   view.addSubview(homePageView)
}

override func viewWillDisappear(_ animated: Bool) {
   homePageView.dispose()
}

控制器几乎只负责调用HomePageView()（主要组件）中屏幕上将要显示的内容。最后，还有另外两个视图。一个转盘HomePageCarrousel()和一个标头HomePageSocialUp()。该视图将实例化后两个实例，并以编程方式设置布局并将其添加为子视图。它还包括一个dispose函数，该函数将实例化的类设置为nil，例如-> Instantiate-homePageCarrousel = HomePageCarrousel()，而dispose函数具有homePageCarrousel = nil

那很好，但是当我通过选项卡栏离开当前视图控制器并导航回去时，现在HomePageCarrousel()中有两个HomePageSocialUp()和HomeView的实例

我可能在某处拥有很强的参考力，但我不知道何时。有人可以指出我应该在哪里调试它，或者是什么造成了问题。

如果出现问题，我还将提供重复的两个视图的代码

HomePageSocialUp

class HomePageSocialUp: UIView {
   
   let logo = UIImage(named: "LogoSmiles")
   let socialImages: [UIImage] = [UIImage(named: "tripadvisor")!,UIImage(named: "instagram")!,UIImage(named: "facebook")!,UIImage(named: "linkedin")!]
   
   func setupHeaderCircle() {
      guard let insetTop = UIApplication.shared.keywindow?.safeAreaInsets.top else {return}
      let circlePath = UIBezierPath(arcCenter: CGPoint(x: UIScreen.main.bounds.width / 2,y: insetTop + 60),radius: CGFloat(90),startAngle: CGFloat(0),endAngle: CGFloat(Double.pi * 2),clockwise: true)
      
      let shapelayer = CAShapelayer()
      shapelayer.path = circlePath.cgPath
      
      shapelayer.fillColor = UIColor.white.cgColor
      
      layer.addSublayer(shapelayer)
   }
   
   func setupSocialHeader() {
      setupHeaderCircle()
      layer.masksToBounds = true;
      
      backgroundColor = UIColor.TintColor
      layer.shadowColor = UIColor.lightGray.cgColor
      layer.shadowOpacity = 0.8
      layer.shadowOffset = CGSize(width: 0.0,height: 0.0)
      layer.shadowRadius = 3.0
      layer.masksToBounds = false
      frame = CGRect(x: 0,y: 0,width: UIScreen.main.bounds.width,height: 280)
      
      let imageView = UIImageView()
      guard let logo = logo else {return}
      guard let insetTop = UIApplication.shared.keywindow?.safeAreaInsets.top else {return}
      imageView.frame = CGRect(x: CGFloat(Int((UIScreen.main.bounds.width - (logo.size.width)))) / 2,y: 120 - (logo.size.width / 2),width: logo.size.width,height: logo.size.height)
      imageView.image = logo
      addSubview(imageView)
      
   }
}

HomeCarCarrousel

class HomePageCarrousel: UIScrollView {
   
   
   var images: [UIImage]?
   
   var originX = 0
   var numberOfIterations = 0
   var timer: Timer?
   
   func setupCarrousel() {
      
      let x = (Int(UIScreen.main.bounds.width) - (Int(UIScreen.main.bounds.width) - 60)) / 2
      frame = CGRect(x: x,y: (Int(frame.origin.y) - 350) / 2,width: Int(UIScreen.main.bounds.width) - 60,height: 350)
      
      let newImage = textToImage(drawText: "Creating Smiles in unique places.",frame: frame,inImage: UIImage(named: "smiles1")!,atPoint: CGPoint(x: frame.origin.x + 20,y: frame.height - 20))
      
      images = [newImage,UIImage(named: "smiles2")!]
      
      guard timer == nil else { return }
      timer = Timer.scheduledTimer(timeInterval: 2,target: self,selector: #selector(startScrolling),userInfo: nil,repeats: true)
      
      guard let imageCount = images?.count,let images = images else { return }
      contentSize = CGSize(width: frame.width * CGFloat(images.count),height: frame.height)
      for image in 0..<imageCount {
         let imageView = UIImageView()
         imageView.image = images[image]
         imageView.contentMode = .scaleAspectFill
         imageView.clipsToBounds = true
         
         let xPosition = frame.width * CGFloat(image)
         imageView.frame = CGRect(x: xPosition,width: frame.width,height: frame.height)
         addSubview(imageView)
      }
      
      timer?.fire()
   }
   
   func textToImage(drawText text: String,frame: CGRect,inImage image: UIImage,atPoint point: CGPoint) -> UIImage {
      let textColor = UIColor.white
      let textFont = UIFont(name: "Helvetica Bold",size: 12)!
      
      let scale = UIScreen.main.scale
      UIGraphicsBeginImageContextWithOptions(image.size,false,scale)
      
      let textFontAttributes = [
      NSAttributedString.Key.font: textFont,NSAttributedString.Key.foregroundColor: textColor,] as [NSAttributedString.Key : Any]
      image.draw(in: CGRect(origin: CGPoint.zero,size: image.size))
      
      text.draw(in: frame,withAttributes: textFontAttributes)
      
      let newImage = UIGraphicsGetImageFromCurrentImageContext()
      UIGraphicsEndImageContext()
      
      return newImage!
   }
   @objc func startScrolling() {
      print(originX)
      guard let images = images else { return }
      if originX == images.count {
         originX = 0
         numberOfIterations += 1
      }
      
      if numberOfIterations > 2 {
         timer?.invalidate()
         timer = nil
         numberOfIterations = 0
      }
      
      let x = CGFloat(originX) * frame.size.width
      setContentOffset(CGPoint(x: x,y: 0),animated: true)
      originX += 1
   }
}

非常感谢