iphone - UIActivityViewController - can't understand this memory leak -

iphone - UIActivityViewController - can't understand this memory leak -

can please tell me why next code leaking in instruments?

uiactivityviewcontroller *activitycontroller = [[uiactivityviewcontroller alloc] initwithactivityitems:activityitems applicationactivities:nil]; activitycontroller.excludedactivitytypes = [nsarray arraywithobjects:@"a",@"b", nil]; [self presentviewcontroller:activitycontroller animated:yes completion:nil]; [activitycontroller release];

instruments show leak on row:

activitycontroller.excludedactivitytypes = [nsarray arraywithobjects:@"a",@"b", nil];

the next should trick (__block , completion)

__block uiactivityviewcontroller *activitycontroller = [[uiactivityviewcontroller alloc] initwithactivityitems:activityitems applicationactivities:nil]; activitycontroller.excludedactivitytypes = [nsarray arraywithobjects:@"a",@"b", nil]; [self presentviewcontroller:activitycontroller animated:yes completion:^{ activitycontroller.excludedactivitytypes=nil; activitycontroller=nil;}]; [activitycontroller release];

see so

iphone ios objective-c memory-leaks uiactivityviewcontroller