In a Cocoa Touch project, I need a specific class to have not only a single delegate object, but many of them.
It looks like I should create an NSArray for these del
You do not want to do this! Cocoa Touch have several concepts for sending events, you should use the proper concept for each case.
What you should do is to look into how to use NSNotificationCenter class. This is the proper way to send a notification that have more than one receiver.