Drill-down interface: is an interface that contains multiple related screens. For example the settings applications has a list of different settings that can be adjusted, when you click on an item you are taken to a different screen in which you can adjust smaller details of the item.
UINavigationController- allows for an easy transition between views. A back button and animation are automatically added to the transitioning views. UINavigationController’s stack is an array.
A keyboard’s appearance based on touch is built into the UITextField and UITextView class. In this chapter we learn how to hide the keyboard based on touching the return button or background.
Touch event– is an event created by touch.
UINavigationBar-location of objects to help navigate between views.