Coordinator Pattern
Coordinators Pattern 'Hello World' with tab bar controller and storyboards.
Recently I came across a talk of Soroush Khanlou about Coordinators. He gives his approach how to solve uverstuffed AppDelegates and reduce M(assive)VC problem. Also take a look at the blog post of Krzysztof Zabłocki about Flow Controllers which is basically the same thing with different naming.