ios - 滚动时未调用 sizeForItemAt

Question

我在 UITableViewCell 中有 UICollectionView ，它的委托(delegate)和数据源在表格单元类中声明。它第一次加载时效果很好，但后来当我滚动集合时会更改它的大小。我注意到 sizeForItemAt 仅在加载时调用，而不是在滚动期间设置单元格时调用。

class HomeCell: UITableViewCell {

    @IBOutlet weak var collHomeSongs: UICollectionView!
    
    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }
    
    func setCollection() {
        collHomeSongs.delegate = self
        collHomeSongs.dataSource = self
    }
}

extension HomeCell: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout{
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 10
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)
        return cell
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize.init(width: 120, height: 180)
    }
}

Answer 1

我刚刚得到了这个问题在 Xcode 11+ 中出现的解决方案，解决方案是将 Collection View 自动大小设置为“无”。引用:Why on Xcode 11, UICollectionViewCell changes size as soon as you scroll (I already set size in sizeForItem AtIndexPath:)?