ComposedProvider.swift

import UIKit

typealias Provider = NSObject & UIApplicationDelegate

class ComposedProvider: Provider {

    // MARK: Property(ies).

    private var providers: [Provider]

    // MARK: Constructor(s).

    init(with providers: [Provider] = []) {
        self.providers = providers
    }

    // MARK: Funtion(s).

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

        let result = self.providers.reduce(true, { result, provider in
            result && provider.application?(application, didFinishLaunchingWithOptions: launchOptions) ?? false
        })

        return result
    }

    func applicationWillTerminate(_ application: UIApplication) {
        self.providers.forEach {
            $0.applicationWillTerminate?(application)
        }
    }

    func applicationDidBecomeActive(_ application: UIApplication) {
        self.providers.forEach {
            $0.applicationDidBecomeActive?(application)
        }
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        self.providers.forEach {
            $0.applicationDidEnterBackground?(application)
        }
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        self.providers.forEach {
            $0.applicationWillEnterForeground?(application)
        }
    }
}