Constraints registering in Swift

gistfile1.swift

import Cocoa

struct Constraint {
    typealias T = (attribute: CAConstraintAttribute, relativeTo:String, relatedAttribute: CAConstraintAttribute, offset: CGFloat)
    let data: T

    func create() -> CAConstraint {
        let newConstraint: AnyObject! = CAConstraint.constraintWithAttribute(data.attribute, relativeTo: data.relativeTo, attribute: data.relatedAttribute, offset: data.offset)
        return newConstraint as CAConstraint
    }
    static func process(list:[T], _ layer:CALayer) {
        for each in list {
            let c = Constraint(data:each).create()
            layer.addConstraint(c)
        }
    }
}

var r = CGRectMake(0,0,300,300)
var view = NSView(frame:r)

var layer = CALayer()
layer.layoutManager = CAConstraintLayoutManager()

//MARK:- You can now create a layer and define constraints in a succinct manner
var layerB = CALayer()
layerB.name = "layerB"
layerB.bounds = CGRectMake(0,0,300,60)
layerB.borderWidth = 2.0
layerB.backgroundColor = NSColor.redColor().CGColor

//MARK:- here's the core idea, use the typed tuple as a container and massage it into a layer
var layerB_Constraints:[Constraint.T] = [
    (.Width, "layerA", .Width, 0),
    (.MidX, "layerA", .MidX, 0),
    (.MaxY, "layerA", .MinY, -10),
    (.MinY, "superlayer", .MinY, +10)]
Constraint.process(layerB_Constraints,layerB)

//MARK:- etc…
var layerA = CALayer()
layerA.name = "layerA"
layerA.bounds = CGRectMake(0,0,200,125)
layerA.borderWidth = 2.0
layerA.backgroundColor = NSColor.greenColor().CGColor

Constraint.process([(.MidY, "superlayer", .MidY, 0), ( .MidX, "superlayer", .MidX, 0)], layerA)


layer.addSublayer(layerA)
layer.addSublayer(layerB)
view.layer = layer

Really cool! Was bummed out to find out CAConstraint is not available on iOS.