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.
}