macOS，Swift 3:segue之后如何取回数据? [英] macOS, Swift 3: How to get data back after segue?

问题描述

例如:我有两个UIViewController.第一个具有按钮和NSTextField，第二个仅具有NSTextField.

For example: I have two UIViewControllers. The first has a button and a NSTextField, and the second has a NSTextField only.

当我单击第一个控制器上的按钮时-第二个控制器显示为弹出窗口.

When I click the button on the first controller — the second controller shows as popover window.

将一些数据从第一个控制器传输到第二个控制器并不重要-我使用segue.但是，我应该怎么做才能将数据从弹出窗口转移回主窗口? 例如::我们打开弹出窗口，在NSTextField中键入一些文本，我想在第一个ViewController的NSTextField中获得此文本.

Making a transfer of some data from first controller to second is not big deal — I use a segue. But what I should to do to transfer data back — from the popover window to main window? For example: we open the popover window, type some text in NSTextField, and I want to get this text in the NSTextField of the first ViewController.

我找不到答案:-(

推荐答案

在macOS中，如果使用情节提要和segues，则非常简单.

In macOS it's pretty easy if you are using storyboard and segues.

NSViewController具有属性presenting，其中包含对父视图控制器的引用.

NSViewController has a property presenting which contains a reference to the parent view controller.

获取引用，在父视图控制器中调用方法以传递数据并关闭子视图控制器.

Obtain the reference, call a method in the parent view controller to pass the data and dismiss the child view controller.

let firstViewController = presenting as! FirstViewController
firstViewController.passDataBack(data)
self.dismiss(self)

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