可移动的CollectionViewCell

1.创建collectionView并设置代理

- (UICollectionView *)collectionView{    if (_collectionView == nil) {        UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];        layout.itemSize = CGSizeMake(50, 50);        _collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 20, self.view.bounds.size.width, self.view.bounds.size.height) collectionViewLayout:layout];        layout.minimumLineSpacing = 10;        layout.minimumInteritemSpacing = 10;        [_collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"Cell"];        _collectionView.backgroundColor = [UIColor cyanColor];        _collectionView.dataSource = self;       //此处给其增加长按手势，用此手势触发cell移动效果        UILongPressGestureRecognizer *longGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handlelongGesture:)];        [_collectionView addGestureRecognizer:longGesture];    }    return _collectionView;}

2.设置其资源

_dataSource = [NSMutableArray array];    for (int i = 1; i <= 50; i++) {        NSString *imageName = [NSString stringWithFormat:@"%d",i];        [_dataSource addObject:imageName];    }

3.监听手势，并设置其允许移动cell和交换资源

- (void)handlelongGesture:(UILongPressGestureRecognizer *)longGesture {    //判断手势状态    switch (longGesture.state) {        case UIGestureRecognizerStateBegan:{            //判断手势落点位置是否在路径上            NSIndexPath *indexPath = [self.collectionView indexPathForItemAtPoint:[longGesture locationInView:self.collectionView]];            if (indexPath == nil) {                break;            }            //在路径上则开始移动该路径上的cell            [self.collectionView beginInteractiveMovementForItemAtIndexPath:indexPath];        }            break;        case UIGestureRecognizerStateChanged:            //移动过程当中随时更新cell位置            [self.collectionView updateInteractiveMovementTargetPosition:[longGesture locationInView:self.collectionView]];            break;        case UIGestureRecognizerStateEnded:            //移动结束后关闭cell移动            [self.collectionView endInteractiveMovement];            break;        default:            [self.collectionView cancelInteractiveMovement];            break;    }}- (BOOL)collectionView:(UICollectionView *)collectionView canMoveItemAtIndexPath:(NSIndexPath *)indexPath{    //返回YES允许其item移动    return YES;}- (void)collectionView:(UICollectionView *)collectionView moveItemAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath*)destinationIndexPath {    //取出源item数据    id objc = [_dataSource objectAtIndex:sourceIndexPath.item];    //从资源数组中移除该数据    [_dataSource removeObject:objc];    //将数据插入到资源数组中的目标位置上    [_dataSource insertObject:objc atIndex:destinationIndexPath.item];}