Using convertPoint to get the relative position inside a parent UIView

Question

I\'ve looked at a dozen SO questions on this topic, and none of the answers have worked for me. Maybe this will help get me back on the right path.

Imagine this set

Answer 1

Here is Swift 3 update of @Pablo's answer, which off course worked great in my case.

if let window = UIApplication.shared.keyWindow {
    parent.convert(child.frame.origin, to: window)
}