Thanks for responding Claude31. I'll need to move my "func possibleCombos()" into my ViewController as it is currently remote. Yes, I'm beginning to see. Since the progressBar must be a member of the ViewController, the "when" and "progressBar.doubleValue" assignment must be made within the class also. I thought (hoping) maybe there was a way to have remote functions "use" or "pass" messages into or out-of the ViewController. It will take me a while to study and assimilate this. Thanks!

In both cases (with and without 1...4) ordinateMinimum should = 0 and ordinateMaximum = 7 For the "little better set" ordinateMinimum should = 1 and ordinateMaximum = 7 It seems the min and max functions abort the sieve if the first pass doesn't yield a value.

actually this set is a little better in illustration: let ranges = [ 1...4 ,0...0 ,1...6 ,3...5 ,0...0 ,2...4 ,3...7 ]

Ah, excellent OOPer. I replaced my code with yours a got something that resembles the TV test pattern. I was worried about my storyboard being buggered, but now I know that's OK. Thanks. The key changes to my code (which now works!) are: declaring let layer = CAShapeLayer() within the loop. I had let shapeLayer = CAShapeLayer(). before the function declaration analysisView.layer?.addSublayer(layer) which provides the missing tie-in to the Outlet Thank you so much!

Ah, so the order of the Outlet statement controls. I tried the order in the StoryBoard without effect. Good to know.