swift - 导航栏下方的菜单在 Swift 中带有动画

Question

我的问题很简单，当我点击(在导航栏上)时，我不知道如何在导航栏下方显示列表(菜单)。

我想做与这张图片相同的事情:

我试着这样做:

func doSomething(){

      let navigationBarHeight = self.navigationController?.navigationBar.frame.height ?? 0
      print(navigationBarHeight)
      let heightTotal = UIApplication.shared.statusBarFrame.height + navigationBarHeight

      DispatchQueue.main.async(execute: {
         appDelegate.infoView(message: "test", Yorigin: heightTotal, color: colorBlueFollow)
      })
   }

在 appDelegate 中:

func infoView(message: String, Yorigin: CGFloat ,color: UIColor){
      if infoViewIsShowing == false{
         infoViewIsShowing = true

//         let infoViewHeight = self.window!.bounds.height / 14.2
         let infoViewHeight = self.window!.bounds.height / 4.2
         let infoViewY = Yorigin - infoViewHeight

         let infoView = UIView(frame: CGRect(x: 0, y: infoViewY, width: self.window!.bounds.width, height: infoViewHeight))
         infoView.backgroundColor = color
         self.window!.addSubview(infoView)

         let infoLabelWidth = infoView.bounds.width
         let infoLabelHeight = infoView.bounds.height + UIApplication.shared.statusBarFrame.height/2

         let infoLabel = UILabel()
         infoLabel.frame.size.width = infoLabelWidth
         infoLabel.frame.size.height = infoLabelHeight
         infoLabel.numberOfLines = 0

         infoLabel.text = message
         infoLabel.font = UIFont(name: "HelveticaNeue", size: 11)
         infoLabel.textColor = UIColor.white
         infoLabel.textAlignment = .center

         infoView.addSubview(infoLabel)

         // Animate errorView
         UIView.animate(withDuration: 0.2, animations: {

            // Move down
            infoView.frame.origin.y = Yorigin

         }, completion: { (finished: Bool) in
            if finished{

               UIView.animate(withDuration: 0.2, delay: 3, options: .curveLinear, animations: {
                  // move up
                  infoView.frame.origin.y = infoViewY

               }, completion: { (finished: Bool) in
                  if finished {
                     infoView.removeFromSuperview()
                     infoLabel.removeFromSuperview()
                     self.infoViewIsShowing = false
                  }
               })

            }
         })


      }
   }

问题是，显示的 View 从导航栏上方经过，这不是我想要的效果。你知道我该怎么做吗？

Answer 1

这一行

self.window!.addSubview(infoView)

将其置于窗口中所有其他 View (包括导航栏)之上。

您应该搜索 View Controller 层次结构，从 rootViewController 开始，找到要将 View 添加到的 Controller 。

查看此问题的答案以获得一些选项:iPhone -- How to find topmost view controller