由于sectionInset与func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets { }协议相同，因此可以调用此协议来知道哪一部分仅剩一个单元。
您可以替换
flowLayout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
if collectionView.numberOfItems(inSection: section) == 1 {
let flowLayout = collectionViewLayout as! UICollectionViewFlowLayout
return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: collectionView.frame.width - flowLayout.itemSize.width)
}
return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
}
效果
image.png
