iOS程序-使用UIScrollView实现分页功能

2025-11-01 03:56:19

1、#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

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

@end

2、#import "ViewController.h"

#define kCount 8

@interface ViewController () <UIScrollViewDelegate>

{

UIPageControl *_pageControl;

}

@end

@implementation ViewController

- (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

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