Displaying data is nice, but adding and editing information is what makes an app really hum.

DrinkMixer is great—it uses some cell customization, and works with plist dictionaries to display data. It’s a handy reference application, and you’ve got a good start on adding new drinks. Now it’s time to give the user the ability to modify the data—saving, editing, and sorting—to make it more useful for everyone. In this chapter, we’ll take a look at editing patterns in iOS apps and how to guide users with the Nav Controller.