xcode Swift 如何在单击按钮时显示 Tabbar
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Swift How to present Tabbar on Button click
提问by Bhaumik Joshi
In my project i want to present Tabbar on button click, now i have already created tabbar and i give identity name as "tabbar" that i show you in below image
在我的项目中，我想在单击按钮时显示 Tabbar，现在我已经创建了 tabbar 并且我将身份名称命名为“tabbar”，我在下图中向您展示
so now i am using below code to call Tab bar controller but i am not getting it.
所以现在我使用下面的代码来调用 Tab bar 控制器，但我没有得到它。
let tabbar: UITabBarController? = (storyboard.instantiateViewController(withIdentifier: "tabbar") as? UITabBarController)
navigationController?.pushViewController(tabbar, animated: true)
can you guys suggest me what i need to do and which code is useful to me to present Tabbar controller.
你们能告诉我我需要做什么以及哪些代码对我展示 Tabbar 控制器有用。
For more specification : i added below image in which there is blue button in one viewController i want to present tab bar controller on click of that blue button
有关更多规范：我添加了下面的图像，其中一个 viewController 中有蓝色按钮，我想在单击该蓝色按钮时显示标签栏控制器
Thank you.
谢谢你。
采纳答案by Krunal
Try this and see:
Using Storyboard Segue:Connect your segue as present modally with your action button.
试试这个，看看：
使用 Storyboard Segue：将您的 segue 与您的操作按钮以模态方式连接。
Programatically: Use selfof view controller (UIViewController) and present it modally, like this.
以编程方式：使用self视图控制器 (UIViewController) 并以模态方式呈现它，就像这样。
if let tabbar = (storyboard.instantiateViewController(withIdentifier: "tabbar") as? UITabBarController) {
self.present(tabbar, animated: true, completion: nil)
}
Here is result:
这是结果：
回答by Abhishek Mitra
Use this, you dont have the Navigation controller over there, thats why it won't push that way, instead, you need to use following code:
使用这个，你那里没有导航控制器，这就是为什么它不会那样推，相反，你需要使用以下代码：
self.present(tabbar, animated: true, completion: nil)
回答by Rahul Dasgupta
According to your images I think that your tabBarController has no back button. Means user cannot go back.
根据您的图片，我认为您的 tabBarController 没有后退按钮。意味着用户不能回去。
If that is the case you can do this.
如果是这种情况，您可以这样做。
let tabBar = self.storyboard?.instantiateViewController(withIdentifier: "tabBar")
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window?.rootViewController = tabBar
回答by Duncan C
You should be aware that Apple's HIG (Human Interface Guidelines) say that if you have a tabbed application that should be the root-level navigation for the entire app. you're not supposed to do what you are trying to do from a human interface perspective.
您应该知道 Apple 的 HIG（人机界面指南）说，如果您有一个选项卡式应用程序，它应该是整个应用程序的根级导航。从人机界面的角度来看，你不应该做你想做的事情。
That said, it should be technically possible.
也就是说，这在技术上应该是可能的。
My guess is that you don't have a navigation controller.
我的猜测是您没有导航控制器。
Use the debugger to check the value of self.navigationController, or add a print statement:
使用调试器检查 的值self.navigationController，或添加打印语句：
let tabbar: UITabBarController? = (storyboard.instantiateViewController(withIdentifier: "tabbar") as? UITabBarController)
print("navigationController = \(navigationController)")
print("tabbar = \(tabbar)")
navigationController?.pushViewController(tabbar, animated: true)
If either navigationControlleror tabbardisplays as nil, that's your problem.
如果navigationController或tabbar显示为 nil，那就是你的问题。
回答by Sh_Khan
Select the viewController from which the button click triggered and Select Editor form xcode menu->Embed In->NavigationController.
选择触发按钮单击的 viewController 并选择编辑器表单 xcode menu->Embed In->NavigationController。
then write this in button action
然后在按钮动作中写下这个
let tabbar: UITabBarController? = (self.storyboard?.instantiateViewController(withIdentifier: "tabbar") as? UITabBarController)
self.navigationController?.pushViewController(tabbar!, animated: true)
