Good practice for disambiguating argument names versus instance variable names in Objective-C

Question

I run into a fairly common scenario in Objective-C where I pass in a variable to an init method and then want to assign it to an instance variable of the same name. However

Answer 1

For setters (and by extension initializers), I believe the convention is to prefix the parameter name with new:

- (void)setCrunk:(Crunk *)newCrunk;
- (id)initWithCrunk:(Crunk *)newCrunk;

In general, I think the most common form I've seen is to call the parameter theCrunk, but Apple seems to recommend aCrunk.