我有一个tableView单元格内的collectionView。collectionView有多个部分。如果部分只有一个单元格,则该单元格将居中显示。如何将单个单元格向左对齐?
collectionView具有以下内容flowLayout
:
let flowLayout = UICollectionViewFlowLayout()
flowLayout.scrollDirection = .vertical
flowLayout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
flowLayout.minimumInteritemSpacing = 0
flowLayout.minimumLineSpacing = 0
flowLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
collectionView.setCollectionViewLayout(flowLayout, animated: true)
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)
带有:
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)
}
该红色单元格是第二部分中剩下的唯一一个,并且保持对齐: