Question

I have the following code:

In .h:

interface .... {
   int CatID;
   ... 
}
@property (readwrite) int CatID;

.m:
// Already includes the header file (.h) 
implementation ... {
   @synthesize CatID;
....
   - (void)setCatIDa:(int)cid {
       self.CatID = 20;

       NSLog(@"cat id: %d", CatID); // this returns 20
   }

   - (IBAction)someTest:(id)sender {
        NSLog(@"cat id: %d", CatID); // returns 0
   }

}

How come its returning 0?

Also the NIB views are changing between the set and get

Answer 1

Without the complete code I can’t see exactly what would cause that behaviour, but I would point out a couple of things that could be improved and may have an impact.

• The property definition doesn’t include (assign) – it’s likely defaulted, but i’d include it just in case. So @property (assign, readwrite) NSInteger catId;
• The iVar’s name starts with an upper case character – it’s an instance, so lowercase should be used. @synthesize catId;
• When referencing it, use self.catId

If you could post the completed interface and implementation it’d be easier to test. I’ve written something very similar here and it works fine…