UICollectionView突出显示带阴影的单元格

Question

我有UICollectionView，中心单元格将突出显示，如下图所示。

我使用以下代码在中心单元格周围制作阴影。

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell : STSuggestStyleCell = collectionView.dequeueReusableCell(for: indexPath)

    if indexPath.row == 4{

        cell.imageProfile.layer.cornerRadius = 2.0
        cell.imageProfile.layer.borderWidth = 1.0;
        cell.imageProfile.layer.borderColor = UIColor.clear.cgColor
        cell.imageProfile.layer.masksToBounds = true;

        cell.imageProfile.layer.shadowColor = UIColor.lightGray.cgColor;
        cell.imageProfile.layer.shadowOffset = CGSize(width: 2.0, height: 2.0);
        cell.imageProfile.layer.shadowRadius = 2.0;
        cell.imageProfile.layer.shadowOpacity = 2.0;
        cell.imageProfile.layer.masksToBounds = false;
        cell.imageProfile.layer.shadowPath = UIBezierPath(roundedRect: cell.imageProfile.bounds, cornerRadius: cell.imageProfile.layer.cornerRadius).cgPath

                    cell.imageProfile.backgroundColor = UIColor.white


    }

    return cell
}

但它无法正常工作。

有谁能告诉我如何使用UICollectionView实现上述设计？

Answer 1

查看中心单元格的红线

细胞本身没有阴影效果。阴影在相邻的细胞上。所以你需要做的就是要求细胞覆盖＆＃34;覆盖＆＃34;在其他细胞上。

只需拨打cell.clipToBounds = true即可让您的中心小区覆盖在相邻小区上。然后确保将阴影效果从中心单元格中消失。

Answer 2

也许你需要创建两个不同的单元格。因为它的重用功能。

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    if indexPath.row == 4{
        let cell : STSuggestStyleCell = collectionView.dequeueReusableCell(for: indexPath)
        cell.imageProfile.layer.cornerRadius = 2.0
        cell.imageProfile.layer.borderWidth = 1.0;
        cell.imageProfile.layer.borderColor = UIColor.clear.cgColor
        cell.imageProfile.layer.masksToBounds = true;

        cell.imageProfile.layer.shadowColor = UIColor.lightGray.cgColor;
        cell.imageProfile.layer.shadowOffset = CGSize(width: 2.0, height: 2.0);
        cell.imageProfile.layer.shadowRadius = 2.0;
        cell.imageProfile.layer.shadowOpacity = 2.0;
        cell.imageProfile.layer.masksToBounds = false;
        cell.imageProfile.layer.shadowPath = UIBezierPath(roundedRect: cell.imageProfile.bounds, cornerRadius: cell.imageProfile.layer.cornerRadius).cgPath

        cell.imageProfile.backgroundColor = UIColor.white
        return cell
    }else{
        let cell : STSuggestNomalCell = collectionView.dequeueReusableCell(for: indexPath)
        return cell
    }
}