iOS 判断第一次登陆

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {//            
    //粘贴内容
    if (![[NSUserDefaults standardUserDefaults] valueForKey:@"isFirst"]) {
        //新手引导页，或者登录页
        AViewController * aVC = [[AViewController alloc]init];
        self.window.rootViewController = aVC;
        [[NSUserDefaults standardUserDefaults] setValue:@"YES" forKey:@"isFirst"];
    }else{
        MainViewController * mainVC = [[MainViewController alloc]init];
        self.window.rootViewController = mainVC;
    }
}

能力有限,只能写这么多.有什么问题欢迎大家留言指正,我看到一定回复.感谢!!!!!!!