UITableView单元重用标识符

我为不同的单元标识符创建了一个结构:

enum CustomCellIdentifiers
{
    static let cellForCountry = "cellForCountry"
    static let cellForCity = "cellForCity"
    static let cellForStoreType = "cellForStoreType"
}

view.tableForItems.register(UINib.init(nibName: cellIdentifier, bundle: nil), forCellReuseIdentifier:cellIdentifier)

但当我注册手机时,我错误地发现 reuseIdentifier 为零:

 class CustomTableCell: UITableViewCell
    {
    override func awakeFromNib()
        {
            super.awakeFromNib()
            // Initialization code
            switch self.reuseIdentifier ?? "cellForCountry" //It only work with country cell
{
            case CustomCellIdentifiers.cellForCountry:
                 print("cellForCountry") break;
            case CustomCellIdentifiers.cellForCity:
                 print("cellForCity")                break;
            case CustomCellIdentifiers.cellForStoreType:
                                print("cellForStoreType")
                break;
            default: break

            }
        }
    }