Creating a view with accessible to underneath view

Question

Problem :

On the first view i have the view which is displaying the map. i have a button when activated adds an another view on top to show a red border where user can see the actual area. But thats raise an issue which user cannot access or touch the underneath map.

What i tried

//Create Border
@IBDesignable
class Frame: UIView {
    override func drawRect(rect: CGRect) {

        //layer.masksToBounds = true
        layer.borderWidth = 10
        layer.borderColor = UIColor.redColor().CGColor
    }
}

ScreenShot