Max Vecheslavov Max Vecheslavov - 26 days ago 14
Swift Question

macOS, Swift 3: How to get data back after segue?

For example: I have two

UIViewController
s. The first has a button and a
NSTextField
, and the second has a
NSTextField
only.

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

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
.

I can't find the answer :-(

Answer

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

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

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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