选择后，UICollectionView会滚动

Question

我有自定义UICollectionView有4个项目和水平滚动。所以3个项目是可见的，还有一个不是。滚动到最后，我想选择last（4）单元格，在此之后 - 我的UICollectionView视图滚动到0.0 offset，所以感觉没有选择单元格（4），但在重新注册到最后，我看到它已被选中。我的目标是删除这个奇怪的“autoscroll”开始。我有自定义布局

    let collectionViewLayout = FullyHorizontalFlowLayout()
    collectionViewLayout.sectionInset = UIEdgeInsetsMake(0, 0, 0, 0);

    collectionViewLayout.itemSize = CGSizeMake((UIScreen.mainScreen().bounds.width - 60) / 3, (((UIScreen.mainScreen().bounds.width - 60) / 3 ) + 50));
    collectionViewLayout.nbColumns = 1;
    collectionViewLayout.nbLines = 1;
    collectionViewLayout.minimumInteritemSpacing = 0
    collectionViewLayout.minimumLineSpacing = 0

    collection.collectionViewLayout = collectionViewLayout
    collection.pagingEnabled = true
    collection.scrollsToTop = false


func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {

    print(self.bottomCollectionView.contentOffset)

    if collectionView.tag == 1 {
        let indexPath = bottomCollectionView.indexPathsForSelectedItems()?.first
        if indexPath != nil {
            bottomCollectionView.deselectItemAtIndexPath(indexPath!, animated: false)
        }
    } else {
        let indexPath = self.collectionView.indexPathsForSelectedItems()?.first
        if indexPath != nil {
            self.collectionView.deselectItemAtIndexPath(indexPath!, animated: false)
        }
    }
    print(self.bottomCollectionView.contentOffset)
}

 func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        if collectionView.tag == 1 {
            let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell_for_master_pick", forIndexPath: indexPath) as! MasterPickCollectionViewCell
            let service = servicesCategoriesArray[indexPath.item]
            cell.masterPhotoView.layer.cornerRadius = (UIScreen.mainScreen().bounds.width - 80) / 6
            cell.photoOutsideView.layer.cornerRadius = (UIScreen.mainScreen().bounds.width - 80) / 6
            print(service.name)
            cell.masterNameLabel.text = service.name
            cell.masterPhotoView.sd_setImageWithURL(NSURL(string: service.image_url!))

            cell.masterPhotoView.backgroundColor = Colors().gBarVioletColor
//            cell.layoutIfNeeded()

            return cell
        } else {
            let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell_for_master_pick", forIndexPath: indexPath) as! MasterPickCollectionViewCell
            let service = packagesArray[indexPath.item]
            cell.masterPhotoView.layer.cornerRadius = (UIScreen.mainScreen().bounds.width - 80) / 6
            cell.photoOutsideView.layer.cornerRadius = (UIScreen.mainScreen().bounds.width - 80) / 6
            print(service.name)
            cell.masterNameLabel.text = service.name
            cell.masterPhotoView.sd_setImageWithURL(NSURL(string: service.image_url!))

            cell.masterPhotoView.backgroundColor = Colors().gBarVioletColor
//            cell.layoutIfNeeded()
            return cell
        }