Almost every app needs to display and accept data from the user. The simplest way to display data is through a label, but sometimes you need to display data and give the user a way to respond. In that case, you need to use an alert controller.
An alert controller can display a sheet that pops up on the screen, giving the user a chance to respond. Alert controllers appear over the user interface to force the user to respond by tapping a button to make a choice or dismiss the alert controller as shown in Figure 12-1.
Figure 12-1
An alert controller typically displays a ...
Get Beginning iPhone Development with Swift 5: Exploring the iOS SDK now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
Dive in for free with a 10-day trial of the O’Reilly learning platform—then explore all the other resources our members count on to build skills and solve problems every day.
