//第一次安装时会有引导页展示  非第一次直接进入应用页

if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"isOne"] isEqual:@"isOne"]) {

        [self showViewController];

    }else{

       RootViewController *root= [[RootViewController alloc] init];

        self.window.rootViewController = root;

        [self isFirstInstall];

    }

 //直接在AppDelegate 类中写该方法

 -(void)isFirstInstall{

//引导页

    UIScrollView *sc = [[UIScrollView alloc]initWithFrame:self.window.bounds];

    sc.pagingEnabled = YES;

    sc.delegate = self;

    sc.showsHorizontalScrollIndicator = NO;

    sc.showsVerticalScrollIndicator = NO;

    [self.window.rootViewController.view addSubview:sc];

    NSArray *arr = @[@"引导页1.jpg",@"引导页2.jpg",@"引导页3.jpg"];

    for (NSInteger i = 0; i<arr.count; i++)

    {

        UIImageView *img = [[UIImageView alloc]initWithFrame:CGRectMake(SCREEN_WIDTH*i, 0, SCREEN_WIDTH, self.window.frame.size.height)];

        img.image = [UIImage imageNamed:arr[i]];

        [sc addSubview:img];

        img.userInteractionEnabled = YES;

        if (i == arr.count - 1)

        {

          //根据自己项目中的需求进行设置末页体验按钮

            UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

            btn.frame = CGRectMake((self.window.frame.size.width/2)-100, SCREEN_HEIGHT-110, 200, 50);

//            btn.backgroundColor = [UIColor greenColor];

//            [btn setTitle:@"开始体验" forState:UIControlStateNormal];

            [btn addTarget:self action:@selector(goRoot) forControlEvents:UIControlEventTouchUpInside];

            [img addSubview:btn];

            [btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];

//            btn.layer.borderWidth = 1;

//            btn.layer.borderColor = [UIColor greenColor].CGColor;

        }

    }

    sc.contentSize = CGSizeMake(SCREEN_WIDTH*arr.count, self.window.frame.size.height);

}

//立即体验的执行方法

- (void)goRoot{

    NSUserDefaults *user = [NSUserDefaults standardUserDefaults];

    [user setObject:@"isOne" forKey:@"isOne"];

    [user synchronize];

 //在这里设置项目中的根控制器

self.window.rootviewController = viewcontroller ;

}

//项目中scrollview的代理方法设置引导页

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

{

   //SCREEN_WIDTH *4 这里4是引导页的张数，x的偏移量大于4个屏幕多30，也可以进入应用，类似立即体验中的功能方法。根据自己项目中的需求进行添加

    if (scrollView.contentOffset.x>SCREEN_WIDTH *4+30)

    {

        [self goRoot];

    }

}

//就是这么easy,引导图设置完毕，共勉

iOS 一个方法首次安装滚播图 展示应用简介