StaticCell.swift

class Cell: UICollectionViewCell {
    @IBOutlet weak var imageView: UIImageView!
    private static var sharedInstance: Cell!
    static func makeCell(width: CGFloat) -> Cell {
        if sharedInstance == nil {
            sharedInstance = UINib(nibName: String(describing: Cell.self)).instantiate(withOwner: nil, options: nil).first as! Cell
            sharedInstance.constrain { [$0.imageView.widthAnchor.constraint(equalToConstant: width)] }
        }
        return sharedInstance
    }
}