遇到别人留下的storyboard的,你需要一个引导图,但是不知道怎么跳转.

{
    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    
    if (![[NSUserDefaults standardUserDefaults] boolForKey:@"firstLaunch"]) {
        [[NSUserDefaults standardUserDefaults]setBool:YES forKey:@"firstLaunch"];
        //        NSLog(@"第一次启动");
        //如果是第一次启动的话，使用UserGuideViewController(用户引导页面) 作为根视图
        UserGuideViewController *userViewController=[[UserGuideViewController alloc]init];
        self.window.rootViewController=userViewController;
    }else{
        NSLog(@"不是第一次启动");
        [self  showHomeViewController];
    }
//跳转到Main
- (void)showHomeViewController
{
    [[UIApplication sharedApplication]setStatusBarHidden:NO];
    UIStoryboard *storyBoard =  [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    
    self.window.rootViewController = [storyBoard instantiateInitialViewController];
}

//按钮的触发时间
-(void)firstpressed{
    //跳转至正文
    [[UIApplication sharedApplication]setStatusBarHidden:NO];
    UIStoryboard *storyBoard =  [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    
    
    
    [self presentViewController:[storyBoard instantiateInitialViewController] animated:YES completion:nil];

}