title: What iOS versions support ARC with __weak designators?
body: <p>I thought that the __Weak designator would only work on iOS5 where you would have to use __unsafe_unretained on previous iOS versions. But in this comment <a href="https://stackoverflow.com/a/8543037/904972">https://stackoverflow.com/a/8543037/904972</a> NJones implies that iOS 4.3+ handles __weak references whereas you have to use __unsafe_unretained on iOS &lt; 4.2. Is this the case or am I misunderstanding the post. If it is the case can you provide a link to an "official" answer from apple.</p>