Question

I want to notify the user about something after some specific time. Are there any resources on this topic? Guides or sample code are particularly helpful. I have read a number of sites about it, but they are all about server side notifications like Facebook notify where if a message arrives or something like that. I just want it triggered locally from the iPhone app with no server involved.

Answer 1

Yep! You’re looking for a UILocalNotification. Once you’ve created one and configured it, you can either present it immediately or schedule it to appear at a certain point in time.

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In other words:

//create the notification
UILocalNotification *notification = [[UILocalNotification alloc] init];
//configure it (this sets the message to be displayed)
[notification setAlertBody:@"This is my local notification!"];
//the notification will show up in 60 seconds
[notification setFireDate:[NSDate dateWithTimeIntervalSinceNow:60]];

//queue up the notification
[[UIApplication sharedApplication] scheduleLocalNotification:notification];
//release the object we no longer care about
[notification release];

That’s all there is to it, really.