SwiftUI Share Sheet Crashes iPad

Question

I was following this tutorial https://jeevatamil.medium.com/how-to-create-share-sheet-uiactivityviewcontroller-in-swiftui-cef64b26f073

to add a simple share sheet to my swiftui app. It works properly on iPhones but crashes on iPad with this error

Terminating app due to uncaught exception 'NSGenericException', reason: 'UIPopoverPresentationController (<UIPopoverPresentationController: 0x107d95ee0>) should have a non-nil sourceView or barButtonItem set before the presentation occurs.'

Any way to get around this error? Not exactly sure what's happening here. Thanks!

Answer 1

You just need to set sourceView and sourceRect on the UIActivityViewController's popoverPresentationController. Here's a more complete and correct example than I've seen so far:

// Get a scene that's showing (iPad can have many instances of the same app, some in the background)
let activeScene = UIApplication.shared.connectedScenes.first(where: { $0.activationState == .foregroundActive }) as? UIWindowScene
        
let rootViewController = (activeScene?.windows ?? []).first(where: { $0.isKeyWindow })?.rootViewController
        
// iPad stuff (fine to leave this in for all iOS devices, it will be effectively ignored when not needed)
activityVC.popoverPresentationController?.sourceView = rootViewController?.view
activityVC.popoverPresentationController?.sourceRect = .zero
        
rootViewController?.present(activityVC, animated: true, completion: nil)