Custom Back Button

CustomBarButton.swift

import UIKit

// Use it...
/*

let bb = CustomBarButton(image: #imageLiteral(resourceName: "leftWhiteChevron"))
bb.addTarget(self, action: #selector(backAction), for: .touchUpInside)
navigationItem.leftBarButtonItem = UIBarButtonItem(customView: bb)

*/

class CustomBarButton: UIControl {
	
	private var buttonImageView: UIImageView = {
		let logoView = UIImageView()
		logoView.contentMode = .scaleAspectFit
		logoView.translatesAutoresizingMaskIntoConstraints = false
		return logoView
	}()
	
	private var mainTitle: UILabel = {
		let label = UILabel()
		label.textColor = .white
		label.font = UIFont.systemFont(ofSize: 17, weight: .regular)
		label.textAlignment = .center
		label.translatesAutoresizingMaskIntoConstraints = false
		return label
	}()
	
	convenience init(title: String = "", image: UIImage) {
		self.init()
		mainTitle.text = title
		buttonImageView.image = image.withRenderingMode(.alwaysTemplate)
	}
	
	override init(frame: CGRect) {
		super.init(frame: frame)
		setupView()
	}
	
	required init?(coder aDecoder: NSCoder) {
		super.init(coder: aDecoder)
		setupView()
	}
	
	private func setupView() {
		addSubview(buttonImageView)
		addSubview(mainTitle)
		setupLayout()
	}
	
	private func setupLayout() {
		
		NSLayoutConstraint.activate([
			// self
			widthAnchor.constraint(equalToConstant: 75),
			heightAnchor.constraint(equalToConstant: 40),
			// logo
			buttonImageView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 0),
			buttonImageView.centerYAnchor.constraint(equalTo: centerYAnchor),
			buttonImageView.widthAnchor.constraint(equalToConstant: 25),
			buttonImageView.heightAnchor.constraint(equalToConstant: 25),
			// label
			mainTitle.centerYAnchor.constraint(equalTo: centerYAnchor),
			mainTitle.leadingAnchor.constraint(equalTo: buttonImageView.centerXAnchor),
			mainTitle.trailingAnchor.constraint(equalTo: safeAreaLayoutGuide.trailingAnchor, constant: 0)
		])
	}
}