How do I create a 1px line in Interface Builder?

Question

Note, I\'m looking to make a 1px line, not a 1pt line. Meaning it should be 1px regardless of screen scale (so 0.5pt on Retina devices).

I can do this programmatica

Answer 1

In Swift:

@IBOutlet var hairlineConstraint: NSLayoutConstraint! {
    didSet {
        hairlineConstraint.constant = 1 / UIScreen.mainScreen().scale
    }
}