Xib Modular View. Extend this class to load contents of your custom views from .nibs.

XibModularView.swift

//
//  XibModularView.swift
//  Pobjects
//
//  Created by Isaac Weisberg on 4/5/18.
//  Copyright © 2018 Isaac Weisberg. All rights reserved.
//

import UIKit

class XibModularView: UIView {
    var xibContentView: UIView!
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        xib()
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        xib()
    }
    
    private func xib() {
        xibContentView = UINib(nibName: "\(self.classForCoder)", bundle: .main).instantiate(withOwner: self, options: nil).first as? UIView
        guard xibContentView != nil else {
            return
        }
        xibContentView.frame = self.bounds
        addSubview(xibContentView)
    }
}

class XibModularTableViewCell: UITableViewCell {
    var xibContentView: UIView!
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        xib()
    }
    
    private func xib() {
        xibContentView = UINib(nibName: "\(self.classForCoder)", bundle: .main).instantiate(withOwner: self, options: nil).first as? UIView
        guard xibContentView != nil else {
            return
        }
        xibContentView.frame = self.bounds
        contentView.addSubview(xibContentView)
    }
}