Correct Form for naming method parameters that clash with property names

If I have a class with a property of notificationCenter, and implement a method with this signature:

-(void)doSomethingWithNotificationCenter:(NSNotificationCenter *)notificationCenter

Xcode rightly gives me an error:

'local declaration of notificationCenter hides instance variable'

So in Objective C is there a c开发者_JAVA百科onvention for naming this parameter to avoid this collision?

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The parameter should be called aNotificationCenter or possibly aCenter.

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This seems like a personal preference, I have seen aNotificationCenter as mentioned above, inNotificationCenter, theNotificationCenter among others. I think as long as you are consistent in your own code any basic, readable choice is OK.

PS - my personal preference is inNotificationCenter.

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I sometimes use the format receivedNotificationCenter or notificationCenterParam.