title: should i release strong properties by myself?
body: <p>I know but not exactly how all the arc works.
  I know when to use weak properties to prevent memory leaks.
  But I want to understand something else.
  If I have <code>UIViewController</code> with strong custom view inside him like this:
  <code>@property (nonatomic) UIView myView;</code> (the default is strong if we not specify anything).
  If this view was weak, I know that don't need to care about releasing it, but what about strong?
  Is it stay alive after my ViewController didDisappear / dealloc when it strong?
  1. Should I set this view to nil in the viewWillDisappear?
  2. Why when I create a weak property it's not exist anymore after I call its "init" method?</p>