上代码前，我们先来看下实现的效果图：
WelcomeViewController.h
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#import <UIKit/UIKit.h>
@interface WelcomeViewController : UIViewController
@end
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WelcomeViewController.m
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#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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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。