How to name a constant in Objective-C?

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After a bit of googling I’ve found the official coding guidelines for Cocoa.

To sum up:

  • Start with a two- or three-letter prefix in ALL-CAPS
  • Rest in UpperCamelCase
  • Same criteria for extern constants

I 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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