title: data passing in navigation based application
body: <p>i am working on a navigation based application
  in the rootviewcontroller i hav a few UITextFields. There is a button on rootviewController, on clicking that button i am changing the view using pushviewcontroller. I want to use values entered in these UItextFields in mapview ie my 2nd view.</p>
  
  <p>PLZ suggest me something.</p>