title: How to change the default navigation speed in iOS SDK?
body: <p>I am navigating from one view controller to another.There is a default time that is specified for navigating from one class to another.Can we change that one programatically i.e. Can we increase or decrease the navigating speed.</p>
  
  <pre><code>FlashScreen *Secreen=[[FlashScreen alloc]initWithNibName:nil bundle:nil];
      [self.navigationController pushViewController:Secreen animated:YES];
  </code></pre>