iOS中ScrollView(滚屏,引导界面,和判段是否是第一次登陆)

#import "RootViewController.h"
#import "SecondViewController.h"
#define kScreenWidth [UIScreen mainScreen].bounds.size.width
#define kScreenHeight [UIScreen mainScreen].bounds.size.height
#define kImageCount 6
#define kImageName @"v6_guide_"
@interface RootViewController ()<UIScrollViewDelegate>

@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self layoutSubview];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
//布局视图
- (void)layoutSubview{
    [self layoutScrollView];
    [self layoutPageControl];
}
//布局UIScrollView
- (void)layoutScrollView{
    //1.创建对象
    UIScrollView *scrollView =[[UIScrollView alloc] initWithFrame:[UIScreen mainScreen].bounds];
    //2.配置属性
    scrollView.contentSize = CGSizeMake(kScreenWidth * kImageCount, kScreenHeight);
    //关闭水平指示器,就是水平滚动条
    scrollView.showsHorizontalScrollIndicator = NO;
    //设置scrollView 能否整屏滑动
    scrollView.pagingEnabled = YES;
    //设置代理
    scrollView.delegate = self;// 此时设置代理的目的,在协议的减速方法中,让scrollView与pageControl中建立联系
    
    
    scrollView.tag = 200;
    //3.添加到父视图
    [self.view addSubview:scrollView];
    //4.释放
    [scrollView release];
    
    //创建UIImageView
    for (int i = 0; i < kImageCount; i++) {
        UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(kScreenWidth * i, 0, kScreenWidth, kScreenHeight)];
        imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"%@%d", kImageName, i + 1]];
        [scrollView addSubview:imageView];
        [imageView release];
        
        //判断是否是最后一张图片
        if (kImageCount - 1 == i) {
            //如果是最后一个imageView添加轻拍手势,为了进入该程序的主界面
            UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)];
            //添加到视图
            [imageView addGestureRecognizer:tapGesture];
            //释放
            [tapGesture release];
            //打开imageView的用户交互
            imageView.userInteractionEnabled = YES;
        }
    }
    
}
//布局UIPageControl
- (void)layoutPageControl{
    UIPageControl *pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(20, kScreenHeight - 30 * 2, kScreenWidth - 20 * 2, 30)];
    pageControl.numberOfPages = kImageCount;
    pageControl.currentPageIndicatorTintColor = [UIColor blackColor];
    pageControl.tag = 300;
    pageControl.pageIndicatorTintColor = [UIColor grayColor];
    //添加响应事件
    [pageControl addTarget:self action:@selector(handlePageControl:) forControlEvents:UIControlEventValueChanged];
    
    
    [self.view addSubview:pageControl];
    [pageControl release];
}

- (void)handlePageControl:(UIPageControl *)pageControl
{
    //1.获取到scrollView
    UIScrollView *scrollVW = (UIScrollView *)[self.view viewWithTag:200];
    //2.修改scrollView偏移量
    [scrollVW setContentOffset:CGPointMake(kScreenWidth *pageControl.currentPage , 0) animated:YES];
}
#pragma mark - UIScrollViewDelegate
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    //1.获取pageControl
    UIPageControl *pageCT = (UIPageControl *)[self.view viewWithTag:300];
   
    //2.设置pageControl索引,当前的点 目的让点随着图而动
    pageCT.currentPage = scrollView.contentOffset.x / kScreenWidth;
    
}

#pragma 轻拍手势

- (void)handleTapGesture:(UITapGestureRecognizer *)tap
{
    //进入程序界面
    SecondViewController *secondViewController = [[SecondViewController alloc] init];
    //将secondVC指定为window的根视图
    [UIApplication sharedApplication].keyWindow.rootViewController = secondViewController;
    //释放
    [secondViewController release];
}








@end

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
   //用户索引项,存储用户信息,程序是否是第一次启动,以及保存用户密码等.
    NSUserDefaults *userDefalts = [NSUserDefaults standardUserDefaults];
    if (![userDefalts boolForKey:@"FirstLanch"]) {
        //把标志符存入本地,下一次判断,滤过分支
        [userDefalts setBool:YES forKey:@"FirstLanch"];
        //立即同步
        [userDefalts synchronize];
        RootViewController *rootView = [[RootViewController alloc] init];
        self.window.rootViewController = rootView;
        [rootView release];
    }else
    {
        SecondViewController *secondVC = [[SecondViewController alloc] init];
        self.window.rootViewController = secondVC;
        [secondVC release];
    }
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

@implementation SecondViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    UIImageView *imgeView = [[UIImageView alloc] initWithFrame:CGRectMake(40, 50, [UIScreen mainScreen].bounds.size.width - 40 * 2, [UIScreen mainScreen].bounds.size.height - 50 * 2)];
    imgeView.image = [UIImage imageNamed:@"1.jpg"];
    [self.view addSubview:imgeView];
    [imgeView release];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}