iOS Programming: The Big Nerd Ranch Guide, 6th Edition

Application States and Transitions

In Homepwner, the items are archived when the application enters the background state. It is useful to understand the states an application can be in, what causes applications to transition between states, and how your code can be notified of these transitions. This information is summarized in Figure 16.6.

Figure 16.6  States of a typical application

The application is first in a “Not Running” state that is shown at the top. An arrow, indicating application launch, then points below to the “Active” state. The methods involved in this process are: “application open parenthesis _ colon willFinishLaunchingWithOptions ...