Constraints configuration with VFL. Scroll view

view_controller.swift

import UIKit

class AboutViewController: UIViewController {
    @IBOutlet weak var menuButton:UIBarButtonItem!

    let regularMarginSize = CGFloat(8)
    let defFont = UIFont.preferredFontForTextStyle(UIFontTextStyleBody)

    override func viewDidLoad() {
        super.viewDidLoad()

        if self.revealViewController() != nil {
            menuButton.target = self.revealViewController()
            menuButton.action = "revealToggle:"
            self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
        }

        self.navigationItem.title = "_____"
        let navBarHeight = self.navigationController?.navigationBar.frame.height

        let companyDescrText = "_____"
        let managementText = " Management"
        let partnershipsText = " Partnerships"


        let vScroll = UIScrollView()
        let vView = UIView()
        let lblDescr = UILabel()
        let btManagement = UIButton(type: .DetailDisclosure)
        let btPartnerships = UIButton(type: .DetailDisclosure)


        vScroll.contentOffset = CGPointZero
        vScroll.contentInset = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
        lblDescr.text = companyDescrText
        lblDescr.lineBreakMode = .ByWordWrapping
        lblDescr.numberOfLines = 0
        lblDescr.sizeToFit()
        lblDescr.font = defFont
        lblDescr.preferredMaxLayoutWidth = self.view.frame.width - regularMarginSize
        btManagement.setTitle(managementText, forState: .Normal)
        btManagement.titleLabel?.font = defFont
        btManagement.addTarget(self, action: "pressed:", forControlEvents: .TouchUpInside)
        btPartnerships.setTitle(partnershipsText, forState: .Normal)
        btPartnerships.titleLabel?.font = defFont
        btPartnerships.addTarget(self, action: "pressed:", forControlEvents: .TouchUpInside)


        let views =
        [
            "vScroll": vScroll,
            "vView": vView,
            "lblDescr": lblDescr,
            "btManagement": btManagement,
            "btPartnerships": btPartnerships
        ]

        vView.addSubview(lblDescr)
        vView.addSubview(btManagement)
        vView.addSubview(btPartnerships)
        vScroll.addSubview(vView)
        self.view.addSubview(vScroll)
        vScroll.translatesAutoresizingMaskIntoConstraints = false
        vView.translatesAutoresizingMaskIntoConstraints = false
        lblDescr.translatesAutoresizingMaskIntoConstraints = false
        btManagement.translatesAutoresizingMaskIntoConstraints = false
        btPartnerships.translatesAutoresizingMaskIntoConstraints = false


        let m = regularMarginSize //for readability
        let n = navBarHeight
        self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[vScroll]|", options: NSLayoutFormatOptions(), metrics: nil, views: views))
        self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-\(n!)-[vScroll]|", options: NSLayoutFormatOptions(), metrics: nil, views: views))
        vScroll.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[vView]|", options: NSLayoutFormatOptions(), metrics: nil, views: views))
        vScroll.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|[vView]|", options: NSLayoutFormatOptions(), metrics: nil, views: views))
        vView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-\(m)-[lblDescr]-\(m)-|", options: NSLayoutFormatOptions(), metrics: nil, views: views))
        vView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-\(m)-[lblDescr]", options: NSLayoutFormatOptions(), metrics: nil, views: views))
        vView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-\(m)-[btManagement]", options: NSLayoutFormatOptions(), metrics: nil, views: views))
        vView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[lblDescr]-\(m)-[btManagement]", options: NSLayoutFormatOptions(), metrics: nil, views: views))
        vView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-\(m)-[btPartnerships]", options: NSLayoutFormatOptions(), metrics: nil, views: views))
        vView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[btManagement]-\(m)-[btPartnerships]-\(m)-|", options: NSLayoutFormatOptions(), metrics: nil, views: views))
    }

    func pressed(sender: UIButton!) {
        print("dsdsdsdsdsdsd")
    }
}