Basic question on retain/release semantics from Apple's reference library
- by davetron5000
I have done Objective-C way back when, and have recently (i.e. just now) read the documentation on Apple's site regarding the use of retain and release. However, there is a bit of code in their Creating an iPhone Application page that has me a bit confused:
- (void)setUpPlacardView
{
// Create the placard view -- it calculates its own frame based on its image.
PlacardView *aPlacardView = [[PlacardView alloc] init];
self.placardView = aPlacardView;
[aPlacardView release]; // What effect does this have on self.placardView?!
placardView.center = self.center;
[self addSubview:placardView];
}
Not seeing the entire class, it seems that self.placardView is also a PlacardView * and the assignment of it to aPlacardView doesn't seem to indicate it will retain a reference to it. So, it appears to me that the line I've commented ([aPlacardView release];) could result in aPlacardView having a retain count of 0 and thus being deallocated. Since self.placardView points to it, wouldn't that now point at deallocated memory and cause a problem?
