title: Auto fill text on web service call response
body: <p>I am new to ios programming, need to implement something like a google search box i.e., autofill text field.
  My scenario is as follow
  1.when user type in text field 
  2.background call to webservice for data(<strong>request data= text field data</strong>).</p>
  
  <p>for example:- if user type "abc" in text field request data for web service call should be "abc" and web service gives response on that. Now next time user type "d"  i.e textfield contains "abcd" service response must consider the appended text.(<strong>something like google search field</strong>)
  3.web service call should be Asynchronous.
  4.response should be displayed in drop down list.</p>
  
  <p>Is it possible in ios???
  Any tutorial or example would be appreciated.
  Thanks in advance.</p>