SwiftUI: pass view information to UIKit

Question

I have a UIKit and AppKit app, and I am displaying a SwiftUI view within it via UIHostingController / NSHostingController. The view has some buttons on it, and I want to pass back the tap event back to a UIKit/AppKit view controller to show UIAlertController from the button that got tapped (I would prefer to use ActionSheet within SwiftUI but it isn't supported on macOS). I pass a delegate through the hosting controller into the SwiftUI view, and use that to call back into the UIKit/AppKit view. But to display a UIAlertController (or even UIActivityViewController), I would need to get some information about the sourceView and sourceRect from the SwiftUI view, else it might crash on iPad.

How do I pass back that information, from the SwiftUI view into the UIKit/Appkit app? I guess the sourceView could be the SwiftUI view on display, but how do I read (and pass back) the rect of the SwiftUI button that was tapped?

This should be helpful stackoverflow.com/a/60214735/12299030. — Asperi
– Asperi, Commented Mar 25, 2021 at 5:34

Z S · Accepted Answer · 2021-03-25 15:54:16Z

0

I found a way to do this. Since the button is a few layers of subviews down from the top-level SwiftUI, I gave that parent view a 'name', by using:

.coordinateSpace(name: "CalloutParentView")

Then I wrapped the button in a GeometryReader, and in the button handler, I got the 'rect' by using:

geometry.frame(in: .named("ParentView")

I passed that through the delegate to the hosting UIViewController, and that can use the SwiftUI view as the sourceView and this rect as the sourceRect

answered Mar 25, 2021 at 15:54

Z S

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