objective-c: double pointers to property not allowed?

Question

I want to create a method like this:

- (void) checkAndUpdateStringProperty: (NSString **) property{
   if (...) 
      *property = @\"whatever\";
}
         


        

Answer 1

I'd do this using the selectors instead (you'll have to convert it to a c function to get it to work without warning (see here):

- (void) checkAndUpdateStringProperty: (SEL)setter {
   if (...) 
     IMP imp = [self methodForSelector:setter];
     void (*func)(id, SEL, id) = (void *)imp;
     func(self, setter, @"whatever");
}

Use this to pass in the selector for the same class:

- (void) somewhereElse{
       ....
       [self checkAndUpdateStringProperty:@selector(setProductName:)];
}