Cell nib template file, because every time I need it I open my old projects.

CellNib.swift

//
//  CellNib.swift
//  miitiOS
//
//  Created by Luis Fernando Mata on 8/31/19.
//  Copyright © 2019 Miit. All rights reserved.
//

import UIKit

public struct CellNib {
    public enum CollectionView: String {
        case myCell
        
        var NibClass: AnyClass? {
            switch self {
            default:
                return nil
            }
        }
    }
    
    public enum TableView: String {
        case myCell
        
        var NibClass: AnyClass? {
            switch self {
            default:
                return nil
            }
        }
    }
    
    public enum ReusableView: String {
        case myReusableView
    }
}

extension UICollectionView {
    public func register(nib: CellNib.CollectionView) {
        // Check if class has a declared Class or should use a xib file
        if let nibClass = nib.NibClass {
            self.register(nibClass, forCellWithReuseIdentifier: nib.rawValue)
            return
        }
        
        self.register(UINib(nibName: nib.rawValue, bundle: nil), forCellWithReuseIdentifier: nib.rawValue)
    }
    
    public func registerReusable(_ nib: CellNib.ReusableView, kind: String) {
        self.register(UINib(nibName: nib.rawValue, bundle: nil), forSupplementaryViewOfKind: kind, withReuseIdentifier: nib.rawValue)
    }
}

extension UITableView {
    public func register(nib: CellNib.TableView) {
        // Check if class has a declared Class or should use a xib file
        if let nibClass = nib.NibClass {
            self.register(nibClass, forCellReuseIdentifier: nib.rawValue)
            return
        }
        
        self.register(UINib(nibName: nib.rawValue, bundle: nil), forCellReuseIdentifier: nib.rawValue)
    }
}