Cocoa Design Patterns

32. Bindings and Controllers

Chapter 29, “Controllers,” describes the roles of Coordinating Controllers and Mediating Controllers within Model View Controller design pattern that permeates Cocoa. Coordinating Controllers initialize, load, and save the Model and View subsystems. Mediating Controllers manage the flow of data between view objects and model objects to minimize coupling between the subsystems. Cocoa supplies the NSApplication, NSDocumentController, NSDocument, NSWindowController, and NSViewController classes among others to provide reusable implementations of most common coordinating tasks. Cocoa also includes NSObjectController, NSArrayController, NSTreeController, and NSUserDefaultsController, which provide reusable implementations ...