title: keyboard does not showing with text fields in iPhone
body: <p>I have a view with 2 text fields for the user inputs.But when clicking on those text fields,keyboard is not showing.I have connected the delegate and implemented the following method.username and password are my text fields.</p>
  
  <pre><code>- (BOOL)textFieldShouldReturn:(UITextField*)txts{
    [username resignFirstResponder];
    [password resignFirstResponder];
    return YES; 
  }
  </code></pre>