This is a relatively common design pattern: https://stackoverflow.com/a/17015041/743957 It allows you to return a subclass from your init calls. I'm trying to figure out the best method of achie...

I am trying to subclass NSNotification. Apple's docs for NSNotificationstate the following: NSNotification is a class cluster with no instance variables. As such, you must subclass NSNotificat...

I was reading that NSArray is just such a thing. Sounds heavy. I have 7 really fat books here on my desk about Objective-C, Cocoa and C. None of them mention Class Cluster at all, at least I can't ...

Parsing through this document on class clusters, NSNumber implements initWithChar: in roughly the following manner: - (id)initWithChar:(char)c { [self release]; return [[__NSCharNumber alloc] in...

So I just got asked this at an interview today and after some googling am still unable to figure out the answer (in fact I couldn't even find any code at all which used the [NSString string] method...

I am trying to subclass NSArray, but it crashes the app when trying to access the count method. I know that NSArray is a class cluster. But what does this mean? Is there a work around to be able ...

My objective here is really simple -- I'm trying to set an NSString to some test data, then return the class, which should be NSString. Here's my code: NSString* stringer = [NSString stringWithFor...