Is there a good guide to writing canonical looking Objective-C /Cocoa APIs? I read the .NET Framework Design Guidelines back when I was doing .NET and it was a

Is there a good guide to writing canonical looking Objective-C /Cocoa APIs? I read the .NET Framework Design Guidelines back when I was doing .NET and it was an excellent how to guide on writing APIs that behaved and felt like they were part of the BCL. Something like that for Objective-C and Cocoa would be a boon.