How to listen for didFinishLaunchingNotification in SwiftUI?

Question

Created Sep ’20

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Hi all,

I'm trying to detect an app launch in a multiplatform SwiftUI app (iOS 14/macOS 11) and having a heck of a time getting onReceive() handlers to catch didFinishLaunchingNotification, despite other notifications are being received as expected.

Here's a simplified version of what I'm trying:

Code Block swiftimport SwiftUI
struct ContentView: View {
    #if os(iOS)
    let didFinishLaunchingNotification = UIApplication.didFinishLaunchingNotification
    let didBecomeActiveNotification = UIApplication.didBecomeActiveNotification
    #else
    let didFinishLaunchingNotification = NSApplication.didFinishLaunchingNotification
    let didBecomeActiveNotification = NSApplication.didBecomeActiveNotification
    #endif
    var body: some View {
        NavigationView {
            SidebarView()
            ListView()
            Text("Content!")
        }
        .onReceive(NotificationCenter.default.publisher(for: didFinishLaunchingNotification)) { _ in
            print("didFinishLaunchingNotification fired")
        }
        .onReceive(NotificationCenter.default.publisher(for: didBecomeActiveNotification)) { _ in
            print("didBecomeActiveNotification fired")
        }
    }
}

Do you all see anything wrong with this approach? Is this a bug in SwiftUI?

Thanks in advance!

Boost

Answer 1

Angelo OP

Sep ’20

Can't update the original post, but I should mention that this works fine in the macOS 11 target; it's the iOS 14 target for the app that's not getting the notification.

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