Swift base class that auto loads xib with the same name from bundle

NibView

//
//  NibView.swift
//
//  Created by Stefan Vasiljevic on 2018-07-07.
//  Copyright © 2018 Stefan Vasiljevic. All rights reserved.
//

import UIKit

@IBDesignable
class NibView: UIView {
    
    weak var view: UIView!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        // Setup view from .xib file
        xibSetup()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        
        // Setup view from .xib file
        xibSetup()
    }
    
    private func xibSetup() {
        self.backgroundColor = UIColor.clear
        
        let nibView = self.loadNib()
        self.view = nibView
        
        nibView.translatesAutoresizingMaskIntoConstraints = false
        nibView.frame = bounds
        self.addSubview(nibView)
        
        NSLayoutConstraint.activate([
            self.topAnchor.constraint(equalTo: nibView.topAnchor),
            self.bottomAnchor.constraint(equalTo: nibView.bottomAnchor),
            self.leadingAnchor.constraint(equalTo: nibView.leadingAnchor),
            self.trailingAnchor.constraint(equalTo: nibView.trailingAnchor)])
    }
    
    /// Loads instance from nib with the same name.
    func loadNib() -> UIView {
        let bundle = Bundle(for: type(of: self))
        let nibName = type(of: self).description().components(separatedBy: ".").last!
        let nib = UINib(nibName: nibName, bundle: bundle)
        return nib.instantiate(withOwner: self, options: nil).first as! UIView
    }

}