ref：http://www.jianshu.com/p/31d07bf32d62

iOS 9之后: 示例如下

效果

前言: 看完你可以学到哪些呢? 就是文章标题那么多, 只有那么多. . 手残效果图没弄好.

@property (nonatomic, strong) UICollectionView *xtCollectionView;

@property (nonatomic, strong) UICollectionViewFlowLayout *flowLayout;

@property (nonatomic, strong) CALayer *dotLayer;

@property (nonatomic, assign) CGFloat endPoint_x;

@property (nonatomic, assign) CGFloat endPoint_y;

@property (nonatomic, strong) UIBezierPath *path;

@property (nonatomic, strong) NSMutableArray *array;

@property (nonatomic, strong) UILongPressGestureRecognizer *longPress;

初始化一个数组

self.array = [NSMutableArray arrayWithObjects:@"红包", @"转账", @"手机充值", @"芝麻信用",

                  @"天猫", @"生活缴费", @"蚂蚁呗", @"世界那么大",

                  @"余额宝", @"安全快付", @"蚂蚁聚宝", @"哈哈",@"红包1", @"转账1", @"手机充值1", @"芝麻信用1",

                  @"天猫1", @"生活缴费1", @"蚂蚁呗1", @"世界那么大1",

                  @"余额宝1", @"安全快付1", @"蚂蚁聚宝1", @"哈哈1",  nil];

创建CollectionView

- (UICollectionView *)xtCollectionView

{

    if (!_xtCollectionView) {

        _flowLayout = [[UICollectionViewFlowLayout alloc] init];

        _flowLayout.minimumLineSpacing = 1;

        _flowLayout.minimumInteritemSpacing = 1;

        _xtCollectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 20, Screen_Width, Screen_Height - 20) collectionViewLayout:_flowLayout];

        _xtCollectionView.dataSource = self;

        _xtCollectionView.backgroundColor = [UIColor colorWithRed:0.8568 green:0.8568 blue:0.8568 alpha:1.0];

        _xtCollectionView.delegate = self;

        [_xtCollectionView registerClass:[XTCollectCell class] forCellWithReuseIdentifier:@"cellIdentiifer"];

    }

    return _xtCollectionView;

}

添加一个长按的手势

_longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(lonePressMoving:)];

[self.xtCollectionView addGestureRecognizer:_longPress];

手势方法的实现

- (void)lonePressMoving:(UILongPressGestureRecognizer *)longPress

{

    switch (_longPress.state) {

        case UIGestureRecognizerStateBegan: {

            {

                NSIndexPath *selectIndexPath = [self.xtCollectionView indexPathForItemAtPoint:[_longPress locationInView:self.xtCollectionView]];

                // 找到当前的cell

                XTCollectCell *cell = (XTCollectCell *)[self.xtCollectionView cellForItemAtIndexPath:selectIndexPath];

                // 定义cell的时候btn是隐藏的, 在这里设置为NO

                [cell.btnDelete setHidden:NO];

                [_xtCollectionView beginInteractiveMovementForItemAtIndexPath:selectIndexPath];

            }

            break;

        }

        case UIGestureRecognizerStateChanged: {

                [self.xtCollectionView updateInteractiveMovementTargetPosition:[longPress locationInView:_longPress.view]];

            break;

        }

        case UIGestureRecognizerStateEnded: {

                [self.xtCollectionView endInteractiveMovement];

            break;

        }

        default: [self.xtCollectionView cancelInteractiveMovement];

            break;

    }

}

移动方法

- (void)collectionView:(UICollectionView *)collectionView moveItemAtIndexPath:(nonnull NSIndexPath *)sourceIndexPath toIndexPath:(nonnull NSIndexPath *)destinationIndexPath

{

    NSIndexPath *selectIndexPath = [self.xtCollectionView indexPathForItemAtPoint:[_longPress locationInView:self.xtCollectionView]];

    // 找到当前的cell

    XTCollectCell *cell = (XTCollectCell *)[self.xtCollectionView cellForItemAtIndexPath:selectIndexPath];

    [cell.btnDelete setHidden:YES];

    [self.array exchangeObjectAtIndex:sourceIndexPath.item withObjectAtIndex:destinationIndexPath.item];

    [self.xtCollectionView reloadData];

}

效果图的解释: collectionView的可编辑状态是"假的", 只是对数据进行了处理
你可能想知道动画的实现可以看我的另一篇博客iOS仿美团外卖饿了吗App点餐动画

iOS9之前可以参照这个

效果

Github上很早的项目了, 希望对有需要的同学有启发的作用, 点我下载感谢作者

补充说明: LXReorderableCollectionViewFlowLayout 这个继承于UICollectionViewFlowLayout So 对于cell的调整是比较随意像系统的一样.
比如调整cell的间距你可以这样.

调整---cell间距

LXReorderableCollectionViewFlowLayout *flowLayout = [[LXReorderableCollectionViewFlowLayout alloc] init];

    flowLayout.minimumLineSpacing = ...;

    flowLayout.minimumInteritemSpacing = ...;

    _collection = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, s_w, s_h) collectionViewLayout:flowLayout];

搭配下面这个方法

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath

{

    return CGSizeMake(..., ...);

}

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