How to use showViewController?
<p>I'm new to Xcode.I'm trying to figure out how to use showViewController.My question is how to call the UIViewController that to display ? via name or a identifier? And where can I find them ? In addition, the document says <code>The default implementation of this method calls the targetViewControllerForAction:sender: method to locate an object in the view controller hierarchy that overrides this method</code>,what does it mean? Should I call <code>targetViewControllerForAction:sender:</code>fist when using <code>showViewController</code>?</p>