Question

So is there a countForKey or something similar to that for NSDictionary? I do know that there is a count method but is there something like countForKey or do I have to make a NSDictionary category for it?

Answer 1

Even though [dictionary count] seems like the easiest approach, you could get the array of keys from the dictionary and then retrieve the array count, so:

NSUInteger keyCount = [dictionary count];

would return the same as:

NSUInteger keyCount = [[dictionary allKeys] count];

EDIT:
With the additional information you provided in the comment, if you want to find out how many ‘keys’ (although your true requirement still isn’t that clear):

NSUInteger keyCountForObject = [[dictionary allKeysForObject:object] count];