效果图

原理

就是设置collectionView调整顺序的代理方法，这里要注意一点
调整过代理方法之后，一定要修改数据源，否则导致错乱。
还有就是在collectionView上面添加一个长按手势，在长按手势的不同阶段，调用collectionView 调整顺序的系统方法 beginInteractiveMovementForItemAtIndexPath
等等

代码

//
//  ViewController.m
//  LBEditCollectionCellOrder
//
//  Created by mac on 2024/6/10.
//#import "ViewController.h"
#import "LBOrderCell.h"@interface ViewController () <UICollectionViewDelegate, UICollectionViewDataSource>@property (nonatomic, strong) UICollectionView *collectionView;@property (nonatomic, strong) UILongPressGestureRecognizer *longPressRecognizer;@property (nonatomic, strong) NSMutableArray *dataArray;@property (nonatomic, assign) BOOL inDrag;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];[self.view addSubview:self.collectionView];[self.collectionView reloadData];[self.collectionView addGestureRecognizer:self.longPressRecognizer];// Do any additional setup after loading the view.
}#pragma mark - 手势拖拽- (BOOL)collectionView:(UICollectionView *)collectionView canMoveItemAtIndexPath:(NSIndexPath *)indexPath
{//最后一个不能拖拽return self.dataArray.count > indexPath.item;
}- (NSIndexPath *)collectionView:(UICollectionView *)collectionView targetIndexPathForMoveOfItemFromOriginalIndexPath:(NSIndexPath *)originalIndexPath atCurrentIndexPath:(NSIndexPath *)currentIndexPath toProposedIndexPath:(NSIndexPath *)proposedIndexPath
{if ([self collectionView:collectionView canMoveItemAtIndexPath:proposedIndexPath]) {return proposedIndexPath;}return originalIndexPath;
}- (void)collectionView:(UICollectionView *)collectionView moveItemAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath
{NSString *title = [self.dataArray objectAtIndex:sourceIndexPath.item];if (!title) {return;}NSInteger targetIdx = destinationIndexPath.item;NSLog(@"修改之前的数量%ld",self.dataArray.count);[self.dataArray removeObject:title];NSLog(@"这里的%@", title);NSLog(@"这是否包含%d", [self.dataArray containsObject:title]);[self.dataArray insertObject:title atIndex:targetIdx];NSLog(@"修改之后的数量%ld", self.dataArray.count);
}#pragma mark - UICollectionViewDelegate, UICollectionViewDataSource- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{return 1;
}- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{return self.dataArray.count;
}- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{LBOrderCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:NSStringFromClass([LBOrderCell class]) forIndexPath:indexPath];[cell updateWithText:self.dataArray[indexPath.item]];return cell;
}#pragma mark - action- (void)longPressRecognizer:(UILongPressGestureRecognizer *)gestureRecognizer
{CGPoint point = [gestureRecognizer locationInView:self.collectionView];switch (gestureRecognizer.state) {case UIGestureRecognizerStateBegan: {NSIndexPath *selectedIndexPath = [self.collectionView indexPathForItemAtPoint:point];if (selectedIndexPath) {[self.collectionView beginInteractiveMovementForItemAtIndexPath:selectedIndexPath];}break;}case UIGestureRecognizerStateChanged: {[self.collectionView updateInteractiveMovementTargetPosition:point];break;;}case UIGestureRecognizerStateEnded: {[self.collectionView endInteractiveMovement];break;}default:{[self.collectionView cancelInteractiveMovement];}break;}
}#pragma mark - lazy load- (UICollectionView *)collectionView
{if (!_collectionView) {UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;CGFloat w = (CGRectGetWidth(self.view.bounds) - 2 * 8 - 2 * 20.5)/3;CGFloat space = 8;layout.itemSize = CGSizeMake(w, w);layout.minimumLineSpacing = space;layout.sectionInset = UIEdgeInsetsMake(0, 16, 0, 16);self.view.clipsToBounds = YES;_collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 100, CGRectGetWidth(self.view.bounds), 350) collectionViewLayout:layout];[_collectionView registerClass:[LBOrderCell class] forCellWithReuseIdentifier:NSStringFromClass([LBOrderCell class])];_collectionView.dataSource = self;_collectionView.delegate = self;_collectionView.backgroundColor = [UIColor cyanColor];}return _collectionView;
}- (UILongPressGestureRecognizer *)longPressRecognizer
{if (!_longPressRecognizer) {_longPressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressRecognizer:)];_longPressRecognizer.minimumPressDuration = 0.3;}return _longPressRecognizer;
}- (NSMutableArray *)dataArray
{if (!_dataArray) {NSArray *array = @[@"1", @"2", @"3", @"4", @"5", @"6",@"7", @"8", @"9", @"10", @"11", @"12"];_dataArray = [NSMutableArray array];[_dataArray addObjectsFromArray:array];}return _dataArray;
}@end

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