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

You can do it in .xib file. Just edit it as text and set constant="0.5" instead of "1" in your view height constraint

<constraints>
<constraint firstAttribute="height" constant="0.5" id="xUN-dm-ggj"/>
</constraints>

In Interface Builder

Answer 2

Seems that it is not possible, one must do it programmatically or build a custom view.

Answer 3

Based on @Nevs12 's answer and it's comments, I think it makes more sense to use such thing:

extension NSLayoutConstraint {
    @IBInspectable var usePixels: Bool {
        get {
            return false // default Value
        }
        set {
            if newValue {
                constant = constant / UIScreen.mainScreen().scale
            }
        }
    }
}

Answer 4

I created NSLayoutConstraint subclass:

class HairlineConstraint: NSLayoutConstraint {
    override func awakeFromNib() {
        super.awakeFromNib()

        self.constant = 1.0 / UIScreen.main.scale
    }
}

Then simply create your view in interface builder, add height constraint

and set its class to HairlineConstraint.

Done.