setupViews.swift

func setupView(){
        view.backgroundColor = .black
        //setup the scrollView
        view.addSubview(parentScrollView)
        parentScrollView.fillSuperview()
        parentScrollView.contentSize = CGSize(width: DeviceSize.width,
                                              height: DeviceSize.height*2)
        
        //setup the content view
        parentScrollView.addSubview(contentView)
        contentView.anchorView(top: parentScrollView.topAnchor,
                               left: parentScrollView.leftAnchor,
                               width: parentScrollView.contentSize.width,
                               height: parentScrollView.contentSize.height)
        
        //setup the header view
        contentView.addSubview(headerView)
        headerView.anchorView(top: contentView.topAnchor,
                              left: contentView.leftAnchor,
                              right: contentView.rightAnchor,
                              height: 450)
    }