我试图在 UITabBar 顶部获得一个视图，一旦使用 Swift 视图出现在它上面，标签栏就会隐藏起来 [英] I am trying to get a view on top of a UITabBar where the tab bar is hidden once the view appears on it using Swift

问题描述

我正在尝试在 UITabbar 上添加一个视图.视图出现后，我希望标签栏隐藏自身.下面我附加了一个我想创建的视图(底部有按钮的视图).我在它后面有一个标签栏，我希望一旦我们点击带有三个点的图标就会出现这个视图.这是我想要创建的视图

I am trying to add a view on top of UITabbar. Once the view appears ,I want the tab bar to hide itself. Below I am attaching a view that I want to create (the bottom view that has buttons on it). I have a tab bar behind it and I want this view to appear once we click on the icon with three dots. This is the view that I want to create

我添加了以下代码以在选项卡栏上显示视图，但它与中心对齐，我不知道如何将其置于底部.我尝试使用约束，但这没有用.附加我在故事板中创建的视图:我想在标签栏上显示这个视图它现在是一个虚拟视图.>

I added below code to present a view over tabbar but it is aligning to the centre and I am not aware how to bring it to the bottom. I tried using constraints but that didn't work. Attaching the view i created in storyboard: I want to show this view on tab bar Its a dummy view for now.

Code:
 func showViewOnEyeBtnPressed() {
        self.view.addSubview(showViewOnEyeBtn)
        showViewOnEyeBtn.transform = CGAffineTransform.init(scaleX: 1.3, y: 1.3)
        showViewOnEyeBtn.alpha = 0
        showViewOnEyeBtn.center = self.view.center
    
        UIView.animate(withDuration: 0.4) {
            self.showViewOnEyeBtn.alpha = 1
            self.showViewOnEyeBtn.transform = CGAffineTransform.identity
        }
    }

注意:在尝试了评论中的建议后，我的视图如下所示:添加建议后查看 我希望绿色视图在隐藏后占据标签栏视图.

Note: After trying suggestions from the comment my view looks like this: View after adding suggestions I want that green view to occupy the tab bar view once it is hidden.

推荐答案

问题是 - 你在 UIViewController.view 上调用它，你的 UIViewController 嵌入在其中UITabBarController.

The problem is that - you are calling this on UIViewController.view where your UIViewController is embedded inside the UITabBarController.

你应该在 UITabBarController.view 实例上调用如下 -

You should call following on UITabBarController.view instance like -

func showViewOnEyeBtnPressed() {
   guard let targetView = self.tabBarController?.view ?? self.view else { return }
   
   targetView.addSubview(showViewOnEyeBtn)
   showViewOnEyeBtn.transform = CGAffineTransform.init(scaleX: 1.3, y: 1.3)
   showViewOnEyeBtn.alpha = 0
   showViewOnEyeBtn.center = self.view.center
   
   self.tabBarController?.tabBar.isHidden = true 
   UIView.animate(withDuration: 0.4, animations: {
       self.showViewOnEyeBtn.alpha = 1
       self.showViewOnEyeBtn.transform = CGAffineTransform.identity
   }, completion: { (_) in
       self.tabBarController?.tabBar.isHidden = false
   })
}

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