Chapter 15. Using Alert Panels

Occasionally, you will want to warn the user about something by means of an Alert panel. Alert panels are easy to create. While most things in Cocoa are object oriented, showing a modal Alert panel is typically done with a C function: NSRunAlertPanel(). Here is the declaration:

NSInteger NSRunAlertPanel(NSString *title,
                          NSString *msg,
                          NSString *defaultButton,
                          NSString *alternateButton,
                          NSString *otherButton, ...);

The following code would result in the Alert panel shown in Figure 15.1:

NSInteger choice = NSRunAlertPanel(@"Title", @"Message",
                                  @"Default", @"Alternate", @"Other");

Figure 15.1. Example Alert Panel