Create user notification issues using Swift UI

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import UIKit

import CoreData



@UIApplicationMain

class AppDelegate: UIResponder,UIApplicationDelegate{

    func application(_ application:UIApplication,didFinishLaunchingWithOptions launchOptions:[UIApplication.LaunchOptionsKey:Any]?)->Bool{

        
//Cannot convert return expression of type 'Void' to return type 'Bool'
       
UNUserNotificationCenter.current().requestAuthorization(options: [.alert,.sound,.badge]){(granted,error)in

            if granted{

                print("User notifications are allowed.")

                

            }else{

                print("User notifications are not allowed.")

            }

            

        }

        

    }

}

As you can see, the method application(_:didFinishLaunchingWithOptions:) is declared with ->Bool, which means you need to return a Bool value from the method. In case of application(_:didFinishLaunchingWithOptions:), it should be true usually.

Code Block 
    func application(_ application:UIApplication,didFinishLaunchingWithOptions launchOptions:[UIApplication.LaunchOptionsKey:Any]?) -> Bool {
        
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert,.sound,.badge]){(granted,error)in
            
            if granted {
                print("User notifications are allowed.")
            } else {
                print("User notifications are not allowed.")
            }
        }
        return true //<-
    } //End `application(_:didFinishLaunchingWithOptions:)`

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One more, please use the Code block feature (icon <> below the editing area) when you show some code as text.

Thank you very much