Swift Eureka: Form Header Goes underneath NavigationBar - swift

Question

I called a performSegue from a tableView and pushed to a FormVC. However, my header went underneath the navigationBar despite that the UIView is offset 100 pts in the y axis.
My code as follows:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "EventsDetails" {
let destVC = segue.destination as! EventsDetailsViewController
}
}
class EventsDetailsViewController: FormViewController {
override func viewDidLoad() {
super.viewDidLoad()
form +++
Section(){ section in
section.header = {
var header = HeaderFooterView<UIView>(.callback({
let view = UIView(frame: CGRect(x: 0, y: 100, width: 100, height: 180))
let imageView = UIImageView(frame: CGRect(x: 20, y: 10, width: 80, height: 80))
imageView.backgroundColor = .red
imageView.layer.cornerRadius = imageView.frame.size.width / 2
imageView.clipsToBounds = true
let nameLabel = UILabel(frame: CGRect(x: 120, y: 40, width: 150, height: 20))
nameLabel.text = "Test Text"
nameLabel.backgroundColor = .blue
nameLabel.font = UIFont.boldSystemFont(ofSize: 18.0)
view.addSubview(imageView)
view.addSubview(nameLabel)
view.backgroundColor = .white
return view
}))
header.height = { 200 }
return header
}()
}
}
}
Is there a way to move the view down to the bottom of the navBar? By the way I use storyboard. I know this may be a primitive question, but some advice is much appreciated, thanks!