Recipe: Custom Containers
Apple’s split view controller was groundbreaking in that it introduced the notion that more than one controller could live onscreen at a time. Until the split view, the rule was one controller with many views at a time. With the split view, several controllers coexist onscreen, all of them independently responding to orientation and memory events.
Apple exposed this multiple-controller paradigm to developers in the iOS 5 SDK, allowing developers to design a parent controller and add child controllers to it. Events are passed from parent to child as needed. This allows you to build custom containers, outside the Apple-standard set of containers such as tab bar and navigation controllers.
Recipe 7-7 builds a reusable ...
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