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];
}

UserGuideViewController.m文件里

//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];

}