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我开始学习 Swift 并决定构建一个应用程序，但没有故事板。

我的 SceneDelegatescene函数实例化了 TabBarController

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

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

我有一个从 UITabBarController 扩展而来的 TabBarController，它几乎可以设置标签栏的样式并将其全部设置好

对于 Tabbar 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“家”。

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()主组件中将显示在屏幕上的任何内容。最后，还有两个观点。一转盘HomePageCarrousel()和一头HomePageSocialUp()。该视图实例化了后者所引用的两个，并以编程方式设置布局并将它们添加为子视图。它还包括一个 dispose 函数，将实例化的类设置为 nil，例如 --> Instantiate -homePageCarrousel = HomePageCarrousel()并且 dispose 函数具有homePageCarrousel = nil

这工作得很好但是当我通过标签栏离开当前视图控制器并导航回它时，现在我有两个HomePageCarrousel()实例HomePageSocialUp()HomeView

等级制度

我可能在某处有很强的参考，但我不知道什么时候。有人可以指出我应该在哪里调试它，或者可能是什么造成了问题。

我还提供了重复的两个视图的代码，以防出现问题

主页SocialUp

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)
      
   }
}

主页Carrousel

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, y: 0, 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
   }
}

预先感谢

4

1 回答 1

1

您是否尝试删除子视图，例如

    homePageView.subviews.forEach { (view) in
    //taking appropriate action to whichever view you want
        view.removeFromSuperview()//for removing views
    }
于 2020-11-03T19:35:39.263 回答