Why do we set delegate to nil at dealloc if the object is going to be destroyed anyway?

Question

-(void) scrollViewDidScroll:(UIScrollView *)scrollView
{
    PO(NSStringFromCGPoint(self.tableView.contentOffset));
    PO(NSStringFromUIEdgeInsets(self.tableView.conten         


        

Answer 1

You need to set delegate to nil in many cases. In your case tableView can be referenced by some external class and will not destroyed after your class dealloc method. And will continue call its delegate method leading to crash. There are several classes that works in another thread (NSURLConnection for example). Even if you release it it can continue calls delegate methods since it is retained in another thread.