On Page https://www.hackingwithswift.com/books/ios-swiftui/ending-the-app-with-allowshittesting

There may be a typo in the text of at the end of the page but the video is correct.

.onChange(of: scenePhase) { newPhase in if newPhase == .active { if cards.isEmpty == false { isActive = true } } else { isActive = false } }

Should be:

    .onChange(of: scenePhase) {
        if scenePhase == .active {
            if cards.isEmpty == false {
                isActive = true
            }
        } else {
            isActive = false
        }
    }

Otherwise you get the warning: 'onChange(of:perform:)' was deprecated in iOS 17.0: Use onChange with a two or zero parameter action closure instead.

I corrected this in the video, but accidentally left the old text in place. This is now fixed – thank you!