IOS-UIScrollView实现图片分页

1.设置可以分页

_scrollView.pagingEnabled = YES;

2.添加PageControl

UIPageControl *pageControl = [[UIPageControl alloc] init];

pageControl.center = CGPointMake(w * 0.5, h - 20);

pageControl.bounds = CGRectMake(0, 0, 150, 50);

3.一共显示多少个圆点（多少页）

pageControl.numberOfPages = kCount;

4.设置非选中页的圆点颜色

pageControl.pageIndicatorTintColor = [UIColor redColor];

5.设置选中页的圆点颜色

pageControl.currentPageIndicatorTintColor = [UIColor blueColor];

6. 禁止默认的点击功能

pageControl.enabled = NO;

7.UIScrollView的代理方法，当scrollView正在滚动的时候调用

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

方法/步骤

1. MJViewController.h

   #import <UIKit/UIKit.h>

   @interface MJViewController : UIViewController

   @property (weak, nonatomic) IBOutlet UIScrollView *scrollView;

   @end

2. MJViewController.m

   #import "MJViewController.h"

   #define kCount 8

   @interface MJViewController () <UIScrollViewDelegate>

   {

   UIPageControl *_pageControl;

   }

   @end

   @implementation MJViewController

   - (void)viewDidLoad

   {

   [super viewDidLoad];

   CGFloat w = self.view.frame.size.width;

   CGFloat h = self.view.frame.size.height;

   for (int i = 0; i< kCount; i++) {

   UIImageView *imageView = [[UIImageView alloc] init];

   // 1.设置frame

   imageView.frame = CGRectMake(i * w, 0, w, h);

   // 2.设置图片

   NSString *imgName = [NSString stringWithFormat:@"0%d.jpg", i + 1];

   imageView.image = [UIImage imageNamed:imgName];

   [_scrollView addSubview:imageView];

   }

   // height == 0 代表 禁止垂直方向滚动

   _scrollView.contentSize = CGSizeMake(kCount * w, 0);

   _scrollView.showsHorizontalScrollIndicator = NO;

   _scrollView.pagingEnabled = YES;

   _scrollView.delegate = self;

   // 添加PageControl

   UIPageControl *pageControl = [[UIPageControl alloc] init];

   pageControl.center = CGPointMake(w * 0.5, h - 20);

   pageControl.bounds = CGRectMake(0, 0, 150, 50);

   pageControl.numberOfPages = kCount; // 一共显示多少个圆点（多少页）

   // 设置非选中页的圆点颜色

   pageControl.pageIndicatorTintColor = [UIColor redColor];

   // 设置选中页的圆点颜色

   pageControl.currentPageIndicatorTintColor = [UIColor blueColor];

   // 禁止默认的点击功能

   pageControl.enabled = NO;

   [self.view addSubview:pageControl];

   _pageControl = pageControl;

   }

   #pragma mark - UIScrollView的代理方法

   #pragma mark 当scrollView正在滚动的时候调用

   - (void)scrollViewDidScroll:(UIScrollView *)scrollView

   {

   int page = scrollView.contentOffset.x / scrollView.frame.size.width;

   //    NSLog(@"%d", page);

   // 设置页码

   _pageControl.currentPage = page;

   }

   @end