gistfile1.swift

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        var redView = UIView()
        redView.backgroundColor = UIColor.redColor()
        
        var greenView = UIView()
        greenView.backgroundColor = UIColor.greenColor()
        
        var blueView = UIView()
        blueView.backgroundColor = UIColor.blueColor()
        
        var spacerView1 = UIView()
        spacerView1.backgroundColor = UIColor(white: 7.0/8.0, alpha: 1.0)
        
        var spacerView2 = UIView()
        spacerView2.backgroundColor = UIColor(white: 7.0/8.0, alpha: 1.0)
        
        for aView in [redView, greenView, blueView, spacerView1, spacerView2] {
            view.addSubview(aView)
        }
        
        for aView in [view, redView, greenView, blueView, spacerView1, spacerView2] {
            aView.setTranslatesAutoresizingMaskIntoConstraints(false)
        }
        
        let viewsDictionary = [
            "redView":redView,
            "greenView":greenView,
            "blueView":blueView,
            "spacerView1":spacerView1,
            "spacerView2":spacerView2,
            "topLayoutGuide":topLayoutGuide
        ]
        
        let metricsDictionary = ["margin":20, "viewWidth":80]
        
        view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat(
            "V:[topLayoutGuide]-12-[redView]",
            options: NSLayoutFormatOptions(0),
            metrics: nil,
            views: viewsDictionary))
        
        view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat(
            "|-margin-[redView(==viewWidth)][spacerView1][greenView(==viewWidth)][spacerView2(==spacerView1)][blueView(==viewWidth)]-margin-|",
            options: .AlignAllTop,
            metrics: metricsDictionary,
            views: viewsDictionary))

        for view in [redView, spacerView1, greenView, spacerView2, blueView] {
            view.addConstraint(NSLayoutConstraint(
                item: view,
                attribute: .Height,
                relatedBy: .Equal,
                toItem: nil,
                attribute: .Height,
                multiplier: 0.0,
                constant: 80))
        }
    }