title: iPhone: why does sending the message resignFirstResponder remove the keyboard?
body: <p>This is a two part question:</p>
  
  <p>1) Why do we need to make the UITextField first responder in the first place ? It will work even if it is not the first responder.</p>
  
  <p>2) Why does the keyboard go away when we send the message resignFirstResponder ? Does the method also remove the keyboard as a side effect ? Why is there not a separate method in UITextView to instruct it to remove the keyboard ?</p>