上代码前，我们先来看下实现的效果图：

WelcomeViewController.h

#import <UIKit/UIKit.h> @interface WelcomeViewController : UIViewController @end

WelcomeViewController.m

#import "WelcomeViewController.h" #define IMAGECOUNT 3 @interface WelcomeViewController () <UIScrollViewDelegate> @property (nonatomic, strong)UIPageControl *pageControl; @end @implementation WelcomeViewController - (void)viewDidLoad { [super viewDidLoad]; //创建ScrollView UIScrollView *sv = [[UIScrollView alloc] init]; sv.frame = self.view.bounds; //设置边缘不弹跳 sv.bounces = NO; //整页滚动 sv.pagingEnabled = YES; sv.showsHorizontalScrollIndicator = NO; //加入多个子视图(ImageView) for(NSInteger i=0; i<IMAGECOUNT; i++){ NSString *imgName = [NSString stringWithFormat:@"%ld", i+1]; UIImage *image = [UIImage imageNamed:imgName]; UIImageView *imageView = [[UIImageView alloc]initWithImage:image]; CGRect frame = CGRectZero; frame.origin.x = i * sv.frame.size.width; frame.size = sv.frame.size; imageView.frame = frame; [sv addSubview:imageView]; if(i==IMAGECOUNT-1){ //开启图片的用户点击功能 imageView.userInteractionEnabled = YES; //加个按钮 UIButton *button = [[UIButton alloc]init]; button.frame = CGRectMake((imageView.frame.size.width-150)/2, imageView.frame.size.height*0.8, 150, 40); button.backgroundColor = [UIColor orangeColor]; [button setTitle:@"立即体验" forState:UIControlStateNormal]; button.titleLabel.font = [UIFont boldSystemFontOfSize:16]; [imageView addSubview:button]; [button addTarget:self action:@selector(enter) forControlEvents:UIControlEventTouchUpInside]; } } sv.contentSize = CGSizeMake(IMAGECOUNT * sv.frame.size.width, sv.frame.size.height); [self.view addSubview:sv]; //加入页面指示控件PageControl UIPageControl *pageControl = [[UIPageControl alloc]init]; self.pageControl = pageControl; //设置frame pageControl.frame = CGRectMake(0, self.view.frame.size.height - 40, self.view.frame.size.width, 20); //分页面的数量 pageControl.numberOfPages = IMAGECOUNT; //设置小圆点渲染颜色 pageControl.pageIndicatorTintColor = [UIColor whiteColor]; //设置当前选中小圆点的渲染颜色 pageControl.currentPageIndicatorTintColor = [UIColor redColor]; //关闭用户点击交互 pageControl.userInteractionEnabled = NO; [self.view addSubview:pageControl]; sv.delegate = self; } - (void)enter { NSLog(@"进入应用"); } //UIScrollViewDelegate方法 - (void)scrollViewDidScroll:(UIScrollView *)scrollView { CGPoint offset = scrollView.contentOffset; if(offset.x<=0){ offset.x = 0; scrollView.contentOffset = offset; } NSUInteger index = round(offset.x / scrollView.frame.size.width); self.pageControl.currentPage = index; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end

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