UICollectionView:展开单元格动画不一致

有人知道这是否可以配置吗?

违规代码(带有一些语法糖)是:

func collectionView(_ collectionView: UICollectionView,
                    layout collectionViewLayout: UICollectionViewLayout,
                    sizeForItemAt indexPath: IndexPath) -> CGSize {
    let cell = SimpleCalculatedSizeCell.prototype
    let contents = data[indexPath.item]
    cell.label.text = contents
    let width = collectionView.bounds
        .inset(collectionView.contentInset)
        .inset(layout.sectionInset)
        .width
    let finalSize = cell.systemLayoutSizeFitting(
        .init(width: width, height: 0),
        withHorizontalFittingPriority: .required,
        verticalFittingPriority: .fittingSizeLevel)
        .withWidth(width)

    if let selected = selected, selected == indexPath {
        print("\(#function): \(finalSize)")
        return finalSize.withHeight(150)
    }

    print("\(#function): \(finalSize)")

    // return finalSize.withHeight(76) // expands smoothly
    return finalSize.withHeight(75)    // fades and snaps
}

选择处理:

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    selected = selected == indexPath ? nil : indexPath

    UIView.animate(withDuration: 0.25, animations: {
        collectionView.collectionViewLayout.invalidateLayout()
        collectionView.layoutIfNeeded()
    })

谢谢!