AppDelegate.swift

//
//  AppDelegate.swift
//
//  Created by Don Mag on 8/15/18.
//

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

	var window: UIWindow?


	func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

		window = UIWindow(frame: UIScreen.main.bounds)
		let testHViewController = TestHViewController()
		testHViewController.view.backgroundColor = UIColor.red
		window!.rootViewController = testHViewController
		window!.makeKeyAndVisible()
		return true

	}
}

TestHViewController.swift

//
//  TestHViewController.swift
//
//  Created by Don Mag on 8/15/18.
//

import UIKit

@objc class CommonHeaderView: UIView {
	override func layoutSubviews() {
		super.layoutSubviews()
		//
		resetViewHeight()
		print("resetViewHeight is :\(self.frame.height)")
	}
	
	override init(frame: CGRect) {
		super.init(frame: frame)
		resetViewHeight()
	}
	
	required init?(coder aDecoder: NSCoder) {
		super.init(coder: aDecoder)
	}
	
	//MARK:- Reset Height as per device size
	func resetViewHeight()
	{
		self.heightAnchor.constraint(equalTo: self.widthAnchor, multiplier: CGFloat(115.0/320.0), constant: 0).isActive = true
	}
}

class TestHViewController: UIViewController {
	
	let hView: CommonHeaderView = {
		let v = CommonHeaderView()
		v.translatesAutoresizingMaskIntoConstraints = false
		v.backgroundColor = .blue
		return v
	}()
	
	override func viewDidLoad() {
		super.viewDidLoad()
		
		view.addSubview(hView)
		
		NSLayoutConstraint.activate([
			
			hView.topAnchor.constraint(equalTo: view.topAnchor, constant: 0.0),
			hView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 0.0),
			hView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: 0.0),
			
			])

	}
	
}