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Priorities

There is no special Stevia api for priorities. In order to set them, you need to use the good'ol standard api :) By default, Stevia constraints are created with a priority of 751.

let c = NSLayoutConstraint(item: v, attribute: .Top, relatedBy: .Equal, toItem: v, attribute: .Top, multiplier: 1, constant: 0)
c.priority = 1000 // Make a constraint `required`
addConstraint(c)

(label.Width == button.Width * 3).priority = 1000 // Making this a required constraint.

let constraint == view.Height = 50 % Height
// later..
constraint.priority = 750