Objc memory problem at arrays

Question

Hello guys!

Here's my code:

        NSLog(@"rc: %d", [_pagesButton retainCount]);
        NSMutableArray *anArray = [[NSMutableArray alloc] initWithArray:_toolbar.items];
        NSLog(@"rc: %d", [_pagesButton retainCount]);
        [anArray removeObjectAtIndex:2];
        NSLog(@"rc: %d", [_pagesButton retainCount]);
        [_toolbar setItems:anArray animated:YES];
        NSLog(@"rc: %d", [_pagesButton retainCount]);
        [anArray release];
        NSLog(@"rc: %d", [_pagesButton retainCount]);

and here is the output:
rc: 2
rc: 3
rc: 2
rc: 3
rc: 3

The first rc is 2 because the the _pagesButton has retained by the this variable and by the toolbar.items array. After I create the anArray variable the retain count is 3, then I remove the _pagesButton from the anArray variable so the retain count goes to 2. Then I set the _toolbar.items and the retain count goes to 3. But why??? And when I release the anArray variable the retaincount still 3. Why? Please help me a bit.

Answer 1

This memory issue has been asked so many times. Hopefully these links will answer your question. http://stackoverflow.com/questions/3404217/query-regarding-nsstring-object-and-memory-management

http://stackoverflow.com/questions/2020103/memory-management-in-objective-c

http://stackoverflow.com/questions/1575819/objective-c-send-message-to-deallocated-object-is-working-why