I currently working on an iOS app that requires me to support iOS 15+.

I’ve developed a custom SwiftUI button view called ShareButton

The goal of this button is to make the share functionality reusable across the app so that I can add this ShareButton to any view and have the ability to share it’s contents.

I have a navigation router that centralizes transitions, presentations and pushes to other screens and the code in this router is UIKit based.

I use a UIActivityViewController to share.

This is my code:

struct ShareButton: View {
    let url: URL?

    var body: some View {
        shareButton
            .simultaneousGesture(TapGesture().onEnded() {
                completion?()
            })
    }

    @ViewBuilder
    private var shareButton: some View {
        if let url {
            Button {
                navigationRouter.presentActivityViewController(activityItems: [url],
                                                               applicationActivities: [])
            } label: {
                Image(systemName: Constants.Image.shareIcon)
            }
        }
    }

And in my router I have something like this:

func presentActivityViewController(activityItems: [Any], applicationActivities: [UIActivity]?) {
    let activityViewController = UIActivityViewController(activityItems: activityItems, applicationActivities: applicationActivities)
    activityViewController.popoverPresentationController?.sourceView = UIView()
    
    activityViewController.presentInKeyWindowPresentedController()
}

On the iPhone, this works well, however, on the iPad, the share popover originates on the top left of the screen.

I can see that my popoverPresentationController sourceView is a random UIView, so this behavior makes sense and brings me to my first question, is there a way to pass my ShareButton here as a UIView instead ?

What i tried was:

1. changing the sourceView to the top most view controller
2. figuring out the frame of my button using GeometryReader and passing it to the presentActivity function
3. Passing the frame to the presentActivity function and using it as the sourceRect of the popoverPresentationController

This does give me results that are quite close to what I want, however, it is not perfect as the popover hides the button.

So my questions are:

1. What would be the best way to achieve this using my architecture ?
2. Is it possible to pass the swiftUI View as a UIView to the popoverPresentationController.sourceView ?