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What's the naming convention for constants in Objective-C (or most widely used way to name them)?
Is there a different criteria for extern constants?
Some styles I have seen:
NSString* const kPreferenceFirstRun = @"FirstRun"; // Replace "XY" by a prefix representing your company, project or module NSString* const XYPreferenceFirstRun = @"FirstRun"; 
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Constants should be written in uppercase characters separated by underscores. Constant names may also contain digits if appropriate, but not as the first character.
No reserved words start with k so it is easier as a search target. Alternatively, from a graphical aspect, as a leading character it provides a very clear flag in front of the rest of the name.
After a bit of googling I've found the official coding guidelines for Cocoa.
To sum up:
extern constantsI agree with itaiferber that the k prefix style is clearer and also much more useful for autocompletion. It would be interesting to know if this style is more popular than the official guidelines.
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it's seems to me, the best practice is to name constants in upper-case. but cocoa-core developers don't seem to share my opinion)) they use CamelCase for constants
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