iOS Programming: The Big Nerd Ranch Guide

Using UIScrollView

In this section, you are going to add an instance of UIScrollView to Hypnosister. This scroll view will be a direct subview of the window, and the instance of BNRHypnosisView will be a subview of the scroll view, as shown in Figure 5.2.

Figure 5.2  View hierarchy with UIScrollView

Scroll views are typically used for views that are larger than the screen. A scroll view draws a rectangular portion of its subview, and moving your finger, or panning, on the scroll view changes the position of that rectangle on the subview. Thus, you can think of the scroll view as a viewing port that you can move around ...