点击推送通知的横幅时跳转到指定界面

func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject], fetchCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void) {
        badge = badge + 1
        application.applicationIconBadgeNumber = badge
        let vc  =  application.keyWindow?.rootViewController  as? UITabBarController
        if application.applicationState == UIApplicationState.Inactive {
            vc?.selectedIndex = 3
        }
}