title: How to press "Back" button in UINavigationController programmatically
body: <p>I have a <code>UIViewController</code> called <code>FriendsViewController</code> inside a <code>UINavigationController</code>. And a second <code>UIViewController</code> called <code>FriendsDetailedViewController</code>. When navigating from the first view controller to the second, I want to programmatically press the <code>Back</code> button when needed. How to do this?</p>