Instead of bringing up a new window, you will often want to swap out a view and replace it with another. One easy way to do this is to change the content view of a box.
Putting each view in its own nib results in a more modular design. In Mac OS 10.5, Apple added the class
NSViewController to Cocoa. We will make a subclass of
NSViewController for each view that we want to swap in.
In the next chapter, this project will evolve into a relatively sophisticated Core Data application, so we will want each of our view controllers to have access to an
NSManagedObjectContext. Figure 29.1 shows where we are going.
Figure 29.1. Completed ...