Handle Remote Config push notifications

handle-remote-config-push-notifications.swift

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any], fetchCompletionHandler completionHandler: @escaping (_: UIBackgroundFetchResult) -> Void) {
    if userInfo["CONFIG_STATE"] != nil {
        UserDefaults.standard.set(true, forKey: "CONFIG_STATE")
        UserDefaults.standard.synchronize()
    }
​
    completionHandler(UIBackgroundFetchResult.newData)
}