PROPER way to init a custom view with a xib/nib - References: https://blog.supereasyapps.com/how-to-create-round-buttons-using-ibdesignable-on-ios-11/ and https://theswiftdev.com/2018/10/16/custom-uiview-subclass-from-a-xib-file/

CustomView.swift

//
//  IconTitleTextView.swift
//
//  Created by Brent Michalski on 12/23/18.
//  Copyright © 2018 Perlguy, Inc. All rights reserved.
//

// THIS CUSTOM CLASS PROPERLY LOADS FROM A STORYBOARD!!!

import UIKit
import Font_Awesome_Swift

@IBDesignable
class CustomViewView: UIView {

    @IBOutlet weak var containerView: UIView!
    @IBOutlet weak var icon: UIImageView!
    @IBOutlet weak var title: UILabel!
    @IBOutlet weak var text: UILabel!
    
    @IBInspectable var titleTextColor: UIColor {
        get { return title.textColor }
        set { title.textColor = newValue }
    }

    @IBInspectable var textTextColor: UIColor {
        get { return text.textColor }
        set { text.textColor = newValue }
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        initNib()
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        initNib()
    }


    private func initNib() {
        if !self.subviews.isEmpty { return }
        
        let bundle = Bundle(for: CustomViewView.self)
        bundle.loadNibNamed(String(describing: CustomViewView.self), owner: self, options: nil)

        self.addSubview(self.containerView)
        self.containerView.translatesAutoresizingMaskIntoConstraints = false

        NSLayoutConstraint.activate([
            self.containerView.topAnchor.constraint(equalTo: self.topAnchor),
            self.containerView.bottomAnchor.constraint(equalTo: self.bottomAnchor),
            self.containerView.leadingAnchor.constraint(equalTo: self.leadingAnchor),
            self.containerView.trailingAnchor.constraint(equalTo: self.trailingAnchor)
            ])

        clipsToBounds      = true
    }
    
    
    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()
    }
    

}

Found this too:
https://www.kuma.cloud/blog/ios-dev-how-to-solve-failed-to-render-and-update-autolayout-status-when-using-ibdesignable/