title: What is passed as Sender on IBAction?
body: <p>When I use the code <code>-(IBAction) onClick1: (id) sender;</code>, what will be passed as <code>sender</code>? I tried to use the sender as the object id and fails (I mean I used the code <code>sender.tag</code> and it didn't return). </p>
  
  <p>I am sure that when I am using <code>- (void)buttonTouched1:(UIButton *)sender;</code> here the sender should act as an object id.</p>