Graphing Calc (Assign.3) Delegate Not Being Set

[JGalt]

I am trying to set the CalculatorViewController as the delegate for Assignment#3. I've gone through all the steps and the delegate method is not getting called.

When I set the GraphViewController as the delegate, it works, but CalculatorViewController doesn't. I've been wrestling around with this for days and I'm guessing it's some silly thing.

This is the SO post describing my setup in detail:

http://stackoverflow.com/questions/13079476/custom-protocol-not-getting-called-in-xcode-returning-0

Can anyone see where things are breaking down?