comment définir la taille UIView dans la mise en page automatique par programmation swift?

J'en ai fait deux UIView avec Auto Layout l'aide de ce code :

class ViewController: UIViewController {
var view_constraint_V:NSArray = [NSLayoutConstraint]();
var originalValue:CGFloat = 0.0;
var offsetValue:CGFloat = -100;
override func viewDidLoad() {
super.viewDidLoad()
//Do any additional setup after loading the view, typically from a nib.
        var topView = UIView()
topView.setTranslatesAutoresizingMaskIntoConstraints(false)
topView.backgroundColor = UIColor.blackColor()
var bottomView = UIView()
bottomView.setTranslatesAutoresizingMaskIntoConstraints(false)
bottomView.backgroundColor = UIColor.lightGrayColor()
let button   = UIButton()
button.backgroundColor = UIColor.darkGrayColor()
button.setTitle("Click me!", forState: UIControlState.Normal)
button.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
button.setTranslatesAutoresizingMaskIntoConstraints(false)
self.view.addSubview(topView);
self.view.addSubview(bottomView);
bottomView.addSubview(button)
//constraints
        let viewsDictionary = ["top":topView,"bottom":bottomView, "button":button]
//position constraints
        let view_constraint_H:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("H:|-10-[top]-10-|",options: NSLayoutFormatOptions(0),metrics: nil, views: viewsDictionary)
let view_constraint_H2:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("H:|-10-[bottom]-10-|",options: NSLayoutFormatOptions(0),metrics: nil, views: viewsDictionary)
view_constraint_V = NSLayoutConstraint.constraintsWithVisualFormat("V:|-20-[top(bottom)]-[bottom]-10-|", options: NSLayoutFormatOptions.AlignAllLeading, metrics: nil, views: viewsDictionary)
view.addConstraints(view_constraint_H)
view.addConstraints(view_constraint_H2)
view.addConstraints(view_constraint_V)
originalValue = (view_constraint_V[1] as NSLayoutConstraint).constant;
//println((view_constraint_V[1] as NSLayoutConstraint))
        (view_constraint_V[1] as NSLayoutConstraint).constant = offsetValue
//Position button
        let control_constraint_H:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("H:|-30-[button]-30-|", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDictionary)
let control_constraint_V:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("V:|-30-[button(50)]", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDictionary)
bottomView.addConstraints(control_constraint_H)
bottomView.addConstraints(control_constraint_V)
}
/**
Example of dynamically changing the constraints when clicking on a button.
*/
func buttonAction(sender:UIButton!)
{
if (view_constraint_V[1].constant == offsetValue) {
(view_constraint_V[1] as NSLayoutConstraint).constant = originalValue
} else {
(view_constraint_V[1] as NSLayoutConstraint).constant = offsetValue
}
}
}

Maintenant, je veux mettre en vue de dessus une taille égale à 1/3 de vue de dessous de la taille par programme mais je ne sais pas comment faire.

OriginalL'auteur black tiger | 2015-05-24