Types of Alerts

There are two types of alerts, standard and caution. Most alerts should be standard alerts, which display the application icon of the current application, as shown in Figure 1.

Figure 1  A standard alert with an application icon
A standard alert with an application icon

Use a caution alert only to warn the user when a possible side effect of the current task is the inadvertent destruction of data. A caution alert displays a caution icon badged with application icon, as shown in Figure 2.

Figure 2  A caution alert with the caution icon
A caution alert with the caution icon

How you specify the alert type varies according to programmatic interface:

Caution alerts should be used only as specified in the “Alerts” in OS X Human Interface Guidelines section of Apple Human Interface Guidelines.