The Core iOS Developer’s Cookbook, Fifth Edition

Control Events

Controls respond primarily to three kinds of events: those based on touch, those based on value, and those based on edits. Table 2-1 lists the full range of event types available to controls.

Table 2-1 UIControl Event Types

For the most part, events break down along the following lines. Buttons use touch events; the single UIControlEventTouchUpInside event accounts for nearly all button interaction and is the default event created by IB connections. Value events (for example, UIControlEventValueChanged) correspond to user-initiated ...