如何在UICollectionView Swift4+中创建圆周围的实心矩形边框

import UIKit

class CustomCollectionViewCell: UICollectionViewCell {
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        // 创建圆周围的实心矩形边框
        let borderLayer = CAShapeLayer()
        borderLayer.frame = bounds
        borderLayer.fillColor = UIColor.clear.cgColor
        borderLayer.strokeColor = UIColor.red.cgColor
        borderLayer.lineWidth = 2.0
        
        let cornerRadius: CGFloat = 10.0
        let borderPath = UIBezierPath(roundedRect: bounds, cornerRadius: cornerRadius)
        borderLayer.path = borderPath.cgPath
        
        // 添加边框layer
        layer.addSublayer(borderLayer)
    }
}

collectionView.register(CustomCollectionViewCell.self, forCellWithReuseIdentifier: "CustomCell")

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CustomCell", for: indexPath) as! CustomCollectionViewCell
    // 设置其他内容
    return cell
}