Event from CoreLocation or NSdate?

Hi Guys,
Is is possible to create an event that will be responded to from either
a core location update, or a change in the seconds from NSdate?

I mean an event just like a UIbutton or a timer that can be related to an action in my program.

If so, how?
Cheers, Art.

 

This was a silly question.
The function that listens for updates can contain code that links to other functions :roll eyes: