Make "TranslatesAutoresizingMaskIntoConstraints" a drop-down in Interface Builder.

TranslateResizeMaskToConstraints.swift

@IBDesignable
class TranslateResizeMaskToConstraints: UIView {

    @IBInspectable var Enabled:Bool = false

    private var _interfaceBuilderContext = false

    override func awakeFromNib() {
        super.awakeFromNib()
        setTranslatesAutoresizingMaskIntoConstraints(Enabled || _interfaceBuilderContext)
    }

    override func prepareForInterfaceBuilder() {
        _interfaceBuilderContext = true
    }

}