AutoLayout Code

AutoLayout Code

 let myView = UIView()
        myView.setTranslatesAutoresizingMaskIntoConstraints(false)
        myView.backgroundColor = UIColor.greenColor()
        self.view.addSubview(myView)
        
        self.view.addConstraints([
            NSLayoutConstraint(item: myView,
                attribute: .Width,
                relatedBy: .Equal,
                toItem: self.view,
                attribute: .Width,
                multiplier: 4.0/5.0,
                constant: 0.0),
            NSLayoutConstraint(item: myView,
                attribute: .Height,
                relatedBy: .Equal,
                toItem: self.view,
                attribute: .Height,
                multiplier: 2.0/3.0,
                constant: 0.0),
            NSLayoutConstraint(item: myView,
                attribute: .CenterX,
                relatedBy: .Equal,
                toItem: self.view,
                attribute: .CenterX,
                multiplier: 1.0,
                constant: 0.0),
            NSLayoutConstraint(item: myView,
                attribute: .Top,
                relatedBy: .Equal,
                toItem: self.view,
                attribute: .Top,
                multiplier: 1.0,
                constant: 30.0),
            ])