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The Complete Idiot's Guide® To iPad and iPhone App Development by Troy Brant

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Intro to Pickers

Shown below, a picker is an interface element for displaying a list of options to a user:
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A picker in the Clock app on the iPhone.
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DEFINITION
A picker is a slot-machine lookalike that presents a list of options to a user.
In the Clock app, you use a picker to set the amount of time for the timer to run. Pickers are used primarily in situations where you have a list of values a user can choose from. Pickers can be used to specify numeric values—as shown in the previous image—or enumerated strings, such as states or cities. ...

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