Kinds of Alerts
The alertViewStyle property allows you to create several alert styles. The default style (UIAlertViewStyleDefault) creates a standard alert, with a title and message text, followed by buttons, as shown in Figure 3-1. It is the bread and butter of the alert world, allowing you to query for button presses such as Yes/No, Cancel/OK, and other simple choices.
iOS offers three more styles, specifically for entering text:
UIAlertViewStylePlainTextInput—This alert style enables users to enter text.
UIAlertViewStyleSecureTextInput—When ...
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