func applicationDidBecomeActive(application: UIApplication) {

        if let root = self.window?.rootViewController {
            AppPermissionsViewController.restoreControllerIfNeeded(root)
        }
    }

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

        ...

        self.window?.rootViewController?.modalPresentationStyle = UIModalPresentationStyle.CurrentContext;
        return true
    }

AppPermissionsViewController.present(self, types: [.Calendars, .Camera, .Contacts]) { success in
        if success {
            ...
        }