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let options = StretchHeaderOptions()
options.position = .fullScreenTop //underNavigationBar

let canvasSize = CGSize(width: view.frame.size.width, height: 400)
let imageSize = CGSize(width: view.frame.size.width, height: 200)

header = StretchHeader()
header.stretchHeaderSize(headerSize: canvasSize,
                         imageSize: imageSize,
                         controller: self,
                         options: options)
header.imageView.image = UIImage(named: "image view")
header.addSubview(self.searchView)

searchView.translatesAutoresizingMaskIntoConstraints = false
searchView.heightAnchor.constraint(equalToConstant: 200).isActive = true
searchView.topAnchor.constraint(equalTo: header.imageView.bottomAnchor).isActive  = true
searchView.leftAnchor.constraint(equalTo: header.imageView.leftAnchor).isActive  = true
searchView.rightAnchor.constraint(equalTo: header.imageView.rightAnchor).isActive  = true