Almost every app needs to display and accept data from the user. The simplest way to display data is through a Text view, but sometimes you need to display data and give the user a way to respond. In that case, you can use an Alert or an Action Sheet. Yet another way to display options to the user is Contextual Menus.
An Alert pops up on the screen, giving the user a chance to respond. Then users can dismiss the Alert by tapping one or more buttons as shown in Figure 12-1.
Figure ...
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