UICollectionView删除底部边距/无间距

Question

我有一个名为ListaFotos的UICollectionView。这应该显示没有边距的项目，我使用函数ConfigurarCollectionView()更改布局并且它没有显示左侧和右侧的边距，但是当加载第三个项目时，两个第一项之间有空格第三个。图片下来更好地解释了我的问题，代码也是如此。

//Listas
@IBOutlet weak var ListaFotos: UICollectionView!

//MARK: - ViewDidLoad
override func viewDidLoad() {
    super.viewDidLoad()

    self.ListaFotos.delegate = self
    self.ListaFotos.dataSource = self

    ConfigurarCollectionView()
}

//MARK: - CollectionView Config
func ConfigurarCollectionView(){
    let CVLayOut = UICollectionViewFlowLayout()

    CVLayOut.minimumLineSpacing = 0
    CVLayOut.minimumInteritemSpacing = 0

    CVLayOut.scrollDirection = .vertical
    CVLayOut.itemSize.width = self.ListaFotos.frame.size.width/2
    CVLayOut.itemSize.height = self.ListaFotos.frame.size.width/2

    CVLayOut.sectionInset = UIEdgeInsetsMake(0, 0, 0, 0)

    self.ListaFotos.collectionViewLayout = CVLayOut
}