Question

I don’t know assembler well enough to understand so complicated code as Assembly for whole project, but I noticed that if I put strong attribute to the property, a _objc_storeStrong call shows up near the line in my setter where I change my properly;

@interface ClassName : NSObject

@property (strong, nonatomic) NSSet *mySet;

@end


@implementation ClassName

@synthesize mySet;

-(void)setMySet:(NSSet *)newMySet
{
   mySet = newMySet;
   //do stuff
}

@end

So? am I right? Do the ARC compiler automatically determines whether to retain or assign in overridden class depending on property attributes?

Answer 1

In short, yes. Because you set the property as strong, it will be retained by the object. If you declare the property as weak, the implied (synthesized) variable is __weak NSSet *mySet and that won’t retain the object, but it will be a auto-zeroing pointer.