selectItem 时的集合视图布局错误(Swift 5) [英] Collection View layout bug when selectItem (Swift 5)

问题描述

从 viewDidLoad 中选择单元格后布局发生变化

After selecting cell from viewDidLoad Layout is change

选择单元格之前

选择单元格后

let indexPath = IndexPath(row: SelectedFolderIndex, section: 0)       
collectionView.selectItem(at: indexPath, animated: false, scrollPosition: .centeredVertically)

布局

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    return CGSize(width: collectionView.frame.width/2.2, height: 55)
}

ViewDidLoad

let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
layout.sectionInset = UIEdgeInsets(top: 7, left: 12, bottom: 12, right: 12)
layout.minimumInteritemSpacing = 5
layout.minimumLineSpacing = 11
collectionView!.collectionViewLayout = layout
collectionView.delegate = self
collectionView.dataSource = self
collectionView.allowsMultipleSelection = false

推荐答案

你需要从单元格宽度中剪掉插入和间距:

You need to cut insets and spacing from cell width:

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let width = (collectionView.frame.width/2.2) - 2*12 - 11
    return CGSize(width: width, height: 55)
}

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