How to implement a custom Swift object with constraints? - ios

Question

Summary:
I want to implement my own UIView object with specific layout constraints utilizing Swift 3. I'm not sure how to configure the layout constraints in the object I'm customizing. I was thinking of passing in a reference to the super view to append the layout constraints onto.
Question:
How can I implement my own custom user interface object while also maintaining that objects layout constraints in the model instead of the view?
Code:
Custom View:
import Foundation
import UIKit
class CustomView: UIView {
var header: UIView?
var users: [Array<OtherObject>]?
init() {
super.init(frame: UIScreen.main.bounds);
//for debug validation
print("My Custom Init");
return;
}
required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented");
}
func configureTitleHeader(){
header = UIView()
}
func configureConstraints(superView: UIView){
self.configureTitleHeader()
let titleConstraints: [NSLayoutConstraint] = [
NSLayoutConstraint(item: self.header!, attribute: .left, relatedBy: .equal, toItem: superView, attribute: .left, multiplier: 1, constant: 0),
NSLayoutConstraint(item: self.header!, attribute: .right, relatedBy: .equal, toItem: superView, attribute: .right, multiplier: 1, constant: 0),
NSLayoutConstraint(item: self.header!, attribute: .top, relatedBy: .equal, toItem: superView, attribute: .top, multiplier: 1, constant: 0),
NSLayoutConstraint(item: self.header!, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1, constant: 100)
]
superView.addConstraints(titleConstraints)
}
}
UINavigationController:
override func viewDidLoad() {
super.viewDidLoad()
let customView = CustomView()
customView.configureConstraints(superView: self.view)
self.view.addSubview(customView)
}