UIApplicationDelegateAdaptor won't do anything

Question

I just created a SwiftUI project in Xcode 12.5 (12E262) and changed my main App class to

import SwiftUI

class AppDelegate: UIResponder, UIApplicationDelegate {

	func applicationDidFinishLaunching(_ application: UIApplication) {
		print("applicationDidFinishLaunching")
	}

	func applicationDidBecomeActive(_ application: UIApplication) {
		print("applicationDidBecomeActive")
	}

	func applicationDidEnterBackground(_ application: UIApplication) {
		print("applicationDidEnterBackground")
	}

	func applicationWillEnterForeground(_ application: UIApplication) {
		print("applicationWillEnterForeground")
	}

	func applicationWillTerminate(_ application: UIApplication) {
		print("applicationWillTerminate")
	}
}


@main
struct SwiftUIAppDelegateTestsApp: App {

	@UIApplicationDelegateAdaptor(AppDelegate.self) var delegate

    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

No app delegate method is called.

Should the App Delegate listed anywhere else e.g. in the build settings or info plist?

SwiftUI

968

Posted by

1010011010

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Answer 1

your functions signatures are wrong. For example, if you use this it works:

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        print("\n-------> applicationDidFinishLaunching")
        return true
    }

Posted by

workingdogintokyo

Thank you very much! You are right. I should have checked the UIApplicationDelegate protocol https://developer.apple.com/documentation/uikit/uiapplicationdelegate/1622921-application

—
1010011010

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Answer 2

Are you using Firebase in your project? If yes, try disabling the Firebase Swizzling magic in your application's plist file and it should work 😅

    <key>FirebaseAppDelegateProxyEnabled</key>
    <false />

Posted by

mschutz

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Answer 3

your functions signatures are wrong. For example, if you use this it works:

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        print("\n-------> applicationDidFinishLaunching")
        return true
    }

Posted by

workingdogintokyo

Thank you very much! You are right. I should have checked the UIApplicationDelegate protocol https://developer.apple.com/documentation/uikit/uiapplicationdelegate/1622921-application

—
1010011010

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UIApplicationDelegateAdaptor won't do anything

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