UIScrollView 分页滚动，简单代码 tool

1、创建ScrollerPageTool 工具

//
//  ScrollerPageTool.m
//  CIC
//
//  Created by lgy on 2022/1/22.
//#import "ScrollerPageTool.h"@implementation ScrollerPageTool/// 设置监听滑动的方向
/// @param scrollView  滑动的scrollView
- (void) setScrollViewDidScroll:(UIScrollView *)scrollView{if (scrollView.isTracking) {//判断左右滑动时if (scrollView.contentOffset.x < self.lastContentOffset ){//向右self.scrollDirectionLeft = YES;} else if (scrollView. contentOffset.x > self.lastContentOffset ){//向左self.scrollDirectionLeft = NO;}self.lastContentOffset = scrollView.contentOffset.x;}
}/// 设置开始惯性滑动时的处理方式
/// @param scrollView scrollView
- (void) setScrollViewWillBeginDecelerating:(UIScrollView *)scrollView{[self autoScroller:scrollView];
}/// 设置手指滑动结束后的处理方式
/// @param scrollView scrollView
/// @param decelerate 是否惯性滑动
- (void) setSrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{//自动if (!decelerate) {[self autoScroller:scrollView];}
}/// 滑动到自定位置
/// @param scrollView 滑动的UIScrollView
-(void) autoScroller:(UIScrollView *)scrollView{dispatch_async(dispatch_get_main_queue(), ^{CGFloat pageWidth = self.pageWidth;NSInteger index = scrollView.contentOffset.x / self.pageWidth;CGRect frame = scrollView.frame;if (self.scrollDirectionLeft) {[scrollView scrollRectToVisible:CGRectMake(index*pageWidth, 0, frame.size.width, frame.size.height) animated:true];}else {[scrollView scrollRectToVisible:CGRectMake((index+1)*pageWidth, 0, frame.size.width, frame.size.height) animated:true];}});
}@end

2、在 ScrolleView中使用 ScrollerPageTool：

- (void)viewDidLoad {[super viewDidLoad];NSLog(@"%.5lf",powf(1.05, 400));NSLog(@"%.5lf",powf(2, 16));[self.view addSubview:self.coView];self.pageTool = [ScrollerPageTool new];self.pageTool.pageWidth = 320+10;//    self.coView.scrollEnabled = false;
}- (void)scrollViewDidScroll:(UIScrollView *)scrollView{[self.pageTool setScrollViewDidScroll:scrollView];
}- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{[self.pageTool setScrollViewWillBeginDecelerating:scrollView];
}- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{[self.pageTool setSrollViewDidEndDragging:scrollView willDecelerate:decelerate];
}

ScrollerPageTool.h

//
//  ScrollerPageTool.h
//  CIC
//
//  Created by lgy on 2022/1/22.
//#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>NS_ASSUME_NONNULL_BEGIN@interface ScrollerPageTool : NSObject@property(nonatomic,assign) BOOL scrollDirectionLeft;
@property (nonatomic,assign) CGFloat lastContentOffset;
@property (nonatomic,assign) CGFloat pageWidth;/// 设置监听滑动的方向
/// @param scrollView  滑动的scrollView
- (void) setScrollViewDidScroll:(UIScrollView *)scrollView;/// 设置开始惯性滑动时的处理方式
/// @param scrollView scrollView
- (void) setScrollViewWillBeginDecelerating:(UIScrollView *)scrollView;/// 设置手指滑动结束后的处理方式
/// @param scrollView scrollView
/// @param decelerate 是否惯性滑动
- (void) setSrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;@endNS_ASSUME_NONNULL_END

viewController

//
//  ViewController.m
//  CIC
//
//  Created by lgy on 2021/12/22.
//#import "ViewController.h"
#import "ScrollerPageTool.h"@interface ViewController ()<UICollectionViewDelegate,UICollectionViewDataSource>@property (nonatomic,strong) UICollectionView *coView;@property (nonatomic,strong) ScrollerPageTool *pageTool;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];NSLog(@"%.5lf",powf(1.05, 400));NSLog(@"%.5lf",powf(2, 16));[self.view addSubview:self.coView];self.pageTool = [ScrollerPageTool new];self.pageTool.pageWidth = 320+10;//    self.coView.scrollEnabled = false;
}- (void)scrollViewDidScroll:(UIScrollView *)scrollView{[self.pageTool setScrollViewDidScroll:scrollView];
}- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{[self.pageTool setScrollViewWillBeginDecelerating:scrollView];
}- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{[self.pageTool setSrollViewDidEndDragging:scrollView willDecelerate:decelerate];
}-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{return CGSizeMake(320,200);
}- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{return 18;
}- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"UICollectionViewCell" forIndexPath:indexPath];if (indexPath.row % 9 == 0) {cell.backgroundColor = UIColor.brownColor;}else if (indexPath.row % 9 == 1) {cell.backgroundColor = UIColor.blueColor;}else if (indexPath.row % 9 == 2) {cell.backgroundColor = UIColor.grayColor;}else if (indexPath.row % 9 == 3) {cell.backgroundColor = UIColor.yellowColor;}else if (indexPath.row % 9 == 4) {cell.backgroundColor = UIColor.greenColor;}else if (indexPath.row % 9 == 5) {cell.backgroundColor = UIColor.redColor;}else if (indexPath.row % 9 == 6) {cell.backgroundColor = UIColor.blackColor;}else if (indexPath.row % 9 == 7) {cell.backgroundColor = UIColor.cyanColor;}else if (indexPath.row % 9 == 8) {cell.backgroundColor = UIColor.darkGrayColor;}return cell;
}-(UICollectionView *) coView{if (!_coView) {UICollectionViewFlowLayout *flowLayout= [[UICollectionViewFlowLayout alloc]init];flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;flowLayout.minimumLineSpacing = 10;_coView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 200, self.view.frame.size.width, 200) collectionViewLayout:flowLayout];_coView.dataSource = self;_coView.delegate = self;_coView.bounces = false;_coView.showsVerticalScrollIndicator = NO;_coView.showsHorizontalScrollIndicator = NO;//_coView.pagingEnabled = YES;_coView.backgroundColor = [UIColor clearColor];[_coView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"UICollectionViewCell"];}return _coView;
}@end

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