UIViewController adds the methods showViewController(_:sender:) and showDetailViewController(_:sender:) in iOS 8.

They do the right thing with UINavigationController and UISplitViewController, e.g for UINavigationController, showViewController(_:sender:) will push the view controller and showDetailViewController(_:sender:) will do a present it.

In your own custom view controllers, you can also override these methods to display the view controllers appropriately.

The beauty of these pair of methods is that they walk up the view controller hierarchy looking for view controllers that implement them and do the right thing.

Using showViewController(_:sender:) and showDetailViewController(_:sender:) helps decouple the shown/presented view controller from knowledge of the view controller hierarchy.

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