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MDCFlexibleHeaderView height issue

I'm trying to use the MDCFlexibleHeader, in a ViewController with a UIScrollView. The headerView is always set to the minimumHeight, which is weird because I set a maximumHeight also. I think it's because of the way I set my constraints, but I'm not sure I'm doing wrong with my constraints. I tried to use the following as example code

https://github.com/material-components/material-components-ios/tree/develop/demos/Shrine

Here is my code:

import UIKit
import MaterialComponents.MaterialFlexibleHeader

class MainFlexibleHeaderContainerViewController: MDCFlexibleHeaderContainerViewController {

init() {
let viewController = MainViewController(nibName: nil, bundle: nil)
super.init(contentViewController: viewController)

viewController.headerViewController = self.headerViewController
viewController.setupHeaderView()
}

required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}

import UIKit
import MaterialComponents.MaterialFlexibleHeader

class MainViewController: UIViewController {

var headerViewController: MDCFlexibleHeaderViewController!
var scrollView: UIScrollView!
var contentView: UIView!
var myHeaderView = MyHeaderView(frame: .zero)

var heightConstraint: NSLayoutConstraint!

override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
super.init(nibName: nil, bundle: nil)
setupView()
}

required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}

override func viewWillAppear(_ animated: Bool) {
setupNavigationBar()
}

private func setupNavigationBar() {
self.navigationController?.setNavigationBarHidden(true, animated: false)
UIApplication.shared.statusBarStyle = .lightContent
}

private func setupView() {
scrollView = UIScrollView()
scrollView.contentInset = UIEdgeInsets(top: -20, left: 0, bottom: 0, right: 0)
scrollView.bounces = false
scrollView.showsHorizontalScrollIndicator = false
scrollView.showsVerticalScrollIndicator = false
scrollView.translatesAutoresizingMaskIntoConstraints = false
scrollView.delegate = headerViewController
view.addSubview(scrollView)
view.addConstraintsWithFormat(format: "H:|[v0]|", views: scrollView)
view.addConstraintsWithFormat(format: "V:|[v0]|", views: scrollView)
contentView = UIView()
contentView.backgroundColor = .white
scrollView.addSubview(contentView)
scrollView.addConstraintsWithFormat(format: "H:|[v0]|", views: contentView)
scrollView.addConstraintsWithFormat(format: "V:|[v0]|", views: contentView)
view.addConstraint(NSLayoutConstraint(item: contentView, attribute: .width, relatedBy: .equal, toItem: view, attribute: .width, multiplier: 1, constant: 0))
heightConstraint = NSLayoutConstraint(item: contentView, attribute: .height, relatedBy: .equal, toItem: view, attribute: .height, multiplier: 1, constant: 0)
heightConstraint.priority = .defaultLow
view.addConstraint(heightConstraint)

let view1 = UIView()
view1.backgroundColor = .blue
contentView.addSubview(view1)
contentView.addConstraintWithFormat(format: "H:|[v0]|", views: view1)
contentView.addConstraintWithFormat(format: "V:|[v0]|", views: view1)
}

func setupHeaderView() {
let headerView = headerViewController.headerView
headerView.trackingScrollView = scrollView
headerView.maximumHeight = 400
headerView.minimumHeight = 100
headerView.minMaxHeightIncludesSafeArea = true
headerView.backgroundColor = UIColor.white
headerView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
myHeaderView.backgroundColor = .red
myHeaderView = (headerView.bounds)
myHeaderView = [.flexibleWidth, .flexibleHeight]
headerView.addSubview(myHeaderView)
}
}


This is what it looks:

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