title: What is the better approach to communicate between parent and child view controllers?
body: <p>It may be a simple way, but I need some guidance from those who have been familiar with iOS.</p>
  
  <p>If a parent view controller want to send one particular message to all child view controllers, what is the best way?, Still now I have wrote a method in each child view controller and informed whenever necessary, In a situation I want to notify to all childs? What should I do for this?  I don't think I need to write the same method in all ViewControllers.. </p>
  
  <p>or</p>
  
  <p>Do I need to go for subclassing.... thanks....</p>