When I checked the mallco Scribble, and run my code:

 __unsafe_unretained UIView *view;
    {
        view = [[UIView alloc] init];
    }
    [view setNeedsLayout];

mallco Scribble

I got this error:

Thread 1: EXC_BAD_ACCESS (code=1, address=0x10)

But as I know, the address of the released object will fill with 0x55 bytes, but what I got is 0x10.