20.10. Summary

This chapter covered a lot of ground. The Model-View-Controller design pattern permeates the Cocoa frameworks. It influences many different aspects of an application, and brings together the user interface, business logic, and data organization. It involves a dizzying number of classes and employs almost every communications technique discussed so far.

Understanding, and embracing, MVC is a critical step in understanding Cocoa applications. You also learned about key development tools, like Interface Builder, that leverage many Objective-C technologies to create complex user interfaces with almost no code.