ios Xcode / Swift：我如何实现后退按钮？
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Xcode / Swift: How I implement a back button?
提问by Laire
I just started with Xcode and Swift.
我刚开始使用 Xcode 和 Swift。
I try to build my first little App for iOS. But now I have the problem, that I don't know how to implement a the back button, so that i come back to the view before.
我尝试为 iOS 构建我的第一个小应用程序。但是现在我遇到了问题，我不知道如何实现后退按钮，所以我回到了之前的视图。
My Storyboard look like this:
我的故事板看起来像这样：
When I open the A-Z view, I want to display the Back Arrow, which turn me back to the Item 2 view.
当我打开 AZ 视图时，我想显示后退箭头，这使我返回到 Item 2 视图。
To open the A - Z view I connect the button "Medikamente A - Z" with the Navigation Controller.
要打开 A - Z 视图，我将按钮“Medikamente A - Z”与导航控制器连接起来。
采纳答案by little
When using storyboards the back button is usually implemented with unwind segue.
使用故事板时，后退按钮通常使用 unwind segue 实现。
I usually like to follow raywenderlich toturials on UI related topics, like this - http://www.raywenderlich.com/113394/storyboards-tutorial-in-ios-9-part-2
我通常喜欢在 UI 相关主题上关注 raywenderlich toturials，就像这样 - http://www.raywenderlich.com/113394/storyboards-tutorial-in-ios-9-part-2
It include a detailed example of how to implement back button in storyboards. Quoting from it -
它包括如何在故事板中实现后退按钮的详细示例。引用它 -
Storyboards provide the ability to ‘go back' with something called an unwind segue, which you'll implement next. There are three main steps: 1. Create an object for the user to select, usually a button. 2. Create an unwind method in the controller that you want to return to. 3. Hook up the method and the object in the storyboard.
故事板提供了通过称为 unwind segue 的东西“返回”的能力，接下来您将实现它。主要分为三个步骤： 1. 创建一个供用户选择的对象，通常是一个按钮。2. 在要返回的控制器中创建一个 unwind 方法。3.在storyboard中连接方法和对象。
回答by pob21
When using UINavigationController, whenever you push to a new ViewController the back button will automatically appear, so you can jump back to the previous View Controller.
使用 UINavigationController 时，每当您推送到新的 ViewController 时，后退按钮都会自动出现，因此您可以跳回上一个 ViewController。
So it's works like: UIViewController -> UIViewController -> UIViewController
所以它的工作原理是： UIViewController -> UIViewController -> UIViewController
A back button will appear on the last 2 so you can pop back the the previous ViewController.
后退按钮将出现在最后 2 个上，因此您可以弹出前一个 ViewController。
You don't have to do any additional coding for the back button to appear, it'll do it on its own. I hope this clears it up. Let me know if you have any questions.
您不必为后退按钮的出现做任何额外的编码，它会自行完成。我希望这可以解决问题。如果您有任何问题，请告诉我。
回答by BlackVoid
I had the same problem, even when on the storyboard the back button was visible at design time. I deleted the segue, and recreated it with "Show" instead of "Show detail". Changing the segue to "Show" had no effect. I think this is a bug, so if you miss that back button delete and recreate the segue.
我遇到了同样的问题，即使在故事板上后退按钮在设计时也是可见的。我删除了转场，并用“显示”而不是“显示细节”重新创建了它。将 segue 更改为“Show”没有效果。我认为这是一个错误，因此如果您错过了后退按钮，请删除并重新创建转场。
回答by Palle
To implement a back button, your root view controller has to be a Navigation Controller.
The first view controller becomes the navigation root of the navigation controller.
If you want to present another view controller, you select a "Show Detail" relationship as the action for the button which should show the view controller. To do this, Ctrl-click and drag from the button to the destination view controller and select "Show Detail".
要实现后退按钮，您的根视图控制器必须是导航控制器。
第一个视图控制器成为导航控制器的导航根。
如果要显示另一个视图控制器，请选择“显示详细信息”关系作为应显示视图控制器的按钮的操作。为此，按住 Ctrl 键单击并从按钮拖动到目标视图控制器，然后选择“显示详细信息”。
