Is there a common convention for dealing with these scenarios? The following code is what I am using ..

-(id) initWithVariableName: (NSString*)variableName withComparisonValue:(NSString*)comparisonValue {
    self.mustExist = NO;
    self.reverseCondition = NO;
    self.regularExpression = NO;
    self.variableName = variableName;
    self.comparisonValue = comparisonValue;

    return self;
}

But I am getting "Local declaration of 'variableName' hides instance variable" and the same for "comparisonValue". The function signature seems logical to me, but surely there must be a more "acceptable" standard which will still make sense and be accurate but not generate annoying warnings?