Alert Controllers
To allow the user to choose a photo source, you will present an alert with the possible choices. Alerts are often used to display information the user must act on. When you want to display an alert, you create an instance of UIAlertController with a preferred style. The two available styles are UIAlertControllerStyle.actionSheet and UIAlertControllerStyle.alert (Figure 14.9).
Figure 14.9 UIAlertController styles
The .actionSheet style is used to present the user with a list of actions to choose from. The .alert type is used to display critical information and requires the user to decide how to proceed. ...
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