UIcollectionViewCell中UITextField的单边框(swift 3 xcode)

class CustomCell: UICollectionViewCell {
    var textField: UITextField!

    override init(frame: CGRect) {
        super.init(frame: frame)
        
        // 初始化UITextField
        textField = UITextField(frame: bounds.insetBy(dx: 10, dy: 5))
        textField.borderStyle = .none
        textField.layer.borderWidth = 1.0
        textField.layer.borderColor = UIColor.black.cgColor
        
        // 添加UITextField到UICollectionViewCell
        addSubview(textField)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CustomCell", for: indexPath) as! CustomCell
    
    // 设置UITextField的样式和数据
    cell.textField.placeholder = "请输入文本"
    
    return cell
}