Draw 1px border in a UIView

gistfile1.txt

override func drawRect(rect: CGRect) {
        var ctx = UIGraphicsGetCurrentContext()
        var path = UIBezierPath(rect: rect)
        
        var innerBorder = rect
        
        innerBorder.origin.x += 1.0
        innerBorder.origin.y += 1.0
        innerBorder.size.width -= 2.0
        innerBorder.size.height -= 2.0
        
        var innerBorderPath = UIBezierPath(rect: innerBorder)
        path.appendPath(innerBorderPath)
        
        let borderColor = CustomColor().grey
        borderColor.setStroke()
        path.stroke()
    }