iOS调整collectionViewCell顺序

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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