判断应用第一次运行设置指导引用

 UserGuideViewController.h

@interface UserGuideViewController : UIViewController<UIScrollViewDelegate>
{
    UIScrollView *_scrollView;
}

 UserGuideViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    //设置ScrollView的整体触摸与显示区域,注意 宽 高不要超过 320X480(4s,4)否则会出现无法滚动的情况
    _scrollView=[[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, 320, 640)];//iphone5
    //ContentSize的意思就是它所有内容的大小
    [_scrollView setContentSize:CGSizeMake(1280, 640)];
    //开启滚动分页功能，如果不需要这个功能关闭即可
    [_scrollView setPagingEnabled:YES];//视图整页显示
    //[scrollView setBounces:NO]; //避免弹跳效果,避免把根视图露出来
   
    //隐藏横向与纵向的滚动条,是否显示水平拖动条,是否显示竖直拖动条
    [_scrollView setShowsVerticalScrollIndicator:NO];
    [_scrollView setShowsHorizontalScrollIndicator:NO];
   
    //在本类中代理scrollView的整体事件
    [_scrollView setDelegate:self];
   
    UIImageView *imageview = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
    [imageview setImage:[UIImage imageNamed:@"1.jpg"]];
    [_scrollView addSubview:imageview];
   
    UIImageView *imageview1 = [[UIImageView alloc] initWithFrame:CGRectMake(320, 0, 320, 460)];
    [imageview1 setImage:[UIImage imageNamed:@"2.jpg"]];
    [_scrollView addSubview:imageview1];
   
    UIImageView *imageview2 = [[UIImageView alloc] initWithFrame:CGRectMake(640, 0, 320, 460)];
    [imageview2 setImage:[UIImage imageNamed:@"3.jpg"]];
    [_scrollView addSubview:imageview2];
   
    UIImageView *imageview3 = [[UIImageView alloc] initWithFrame:CGRectMake(960, 0, 320, 460)];
    [imageview3 setImage:[UIImage imageNamed:@"4.jpg"]];
    imageview3.userInteractionEnabled = YES;    //打开imageview3的用户交互;否则下面的button无法响应
    [_scrollView addSubview:imageview3];
   
    //添加图片点击事件，可以看我前面博客http://www.cnblogs.com/ioschen/p/3316593.html
//    UITapGestureRecognizer *tapRecognizer=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(ClickEventOnImage:)];
//    imageview3.userInteractionEnabled=YES;
//    [imageview3 addGestureRecognizer:tapRecognizer];
   
   
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];//在imageview3上加载一个透明的button
    [button setTitle:@"go" forState:UIControlStateNormal];
    [button setFrame:CGRectMake(100, 100, 100, 100)];
    [button setBackgroundColor:[UIColor redColor]];
    [button addTarget:self action:@selector(firstpressed) forControlEvents:UIControlEventTouchUpInside];
    [imageview3 addSubview:button];
   
    [self.view addSubview:_scrollView];
   
    //(还可以配合pagecontroller使用)
}
//-(void) ClickEventOnImage:(id)sender
//{
//    NSLog(@"imageview点击事件ok");
//    HomePageViewController *home=[[HomePageViewController alloc]init];
//    [self presentModalViewController:home animated:YES];
//}
- (void)firstpressed
{
    NSLog(@"ok");
    //点击button跳转到根视图
    HomePageViewController *home=[[HomePageViewController alloc]init];
    home.modalPresentationStyle=UIModalPresentationFormSheet;//

    [self presentModalViewController:home animated:YES];//淘汰了，用什么方法呢

 通过查找api发现，使用下面方法可以替代上面的，但是ios6以后的。

[self presentViewController:home animated:YES completion:nil];

}

 下面是YUAppDelegate.m

#import "YUAppDelegate.h"
#import "UserGuideViewController.h"
#import "HomePageViewController.h"
@implementation YUAppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    
    //增加标识，用于判断是否是第一次启动应用...
    if (![[NSUserDefaults standardUserDefaults] boolForKey:@"everLaunched"]) {
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"everLaunched"];
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstLaunch"];
    }
    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"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 *userGuideViewController = [[UserGuideViewController alloc] init];
        self.window.rootViewController = userGuideViewController;
    }
    else
    {
        NSLog(@"不是第一次启动");
        HomePageViewController *home = [[HomePageViewController alloc] init];
        self.window.rootViewController=home;
    }
    
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

判断是否第一次启动有时候出错，不知道什么原因，可能是模拟器的原因吧，有知道的兄弟在评论里告知我。

 下面这些是补充理解的。

//------------------
//手指离开屏幕后ScrollView还会继续滚动一段时间只到停止
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    NSLog(@"结束滚动后缓冲滚动彻底结束时调用");
}
-(void) scrollViewWillBeginDecelerating:(UIScrollView *)scrollView
{
    NSLog(@"结束滚动后开始缓冲滚动时调用");
}
-(void)scrollViewDidScroll:(UIScrollView*)scrollView
{
    NSLog(@"视图滚动中X轴坐标%f",scrollView.contentOffset.x);
    NSLog(@"视图滚动中X轴坐标%f",scrollView.contentOffset.y);
}
-(void)scrollViewWillBeginDragging:(UIScrollView*)scrollView
{
    NSLog(@"滚动视图开始滚动，它只调用一次");
}
-(void)scrollViewDidEndDragging:(UIScrollView*)scrollView willDecelerate:(BOOL)decelerate
{
    NSLog(@"滚动视图结束滚动，它只调用一次");
}
- (void)viewDidUnload
{
    [super viewDidUnload];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
//----------------------------
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}