StackOverflow2013

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3617552
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2010-09-01T11:33:47.967
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2010-09-01T11:33:47.967
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Yes, this has actually changed after the question was initially answered. There are currently at least two ways for a closed application to play a sound or a popup. <ol> <li>An app can register for a Local Notification while it is running, that will be called at a future time even if the app is closed. The notification will display a popup and optionaly play a sound or set a badge on an application's icon. Implementing this is easy: <pre><code> id localNotif = [[NSClassFromString(@"UILocalNotification") alloc] init]; if (!localNotif) { return; } [localNotif setTimeZone:[NSTimeZone defaultTimeZone]]; [localNotif setAlertBody:NSLocalizedString(@"Hello!",nil)]; [localNotif setAlertAction:NSLocalizedString(@"Hello", nil)]; [localNotif setSoundName:UILocalNotificationDefaultSoundName]; [localNotif setFireDate:[[NSDate date] addTimeInterval:(60*60)]]; [localNotif setFireDate:[[NSDate date] addTimeInterval:(24*60*60)]]; [[UIApplication sharedApplication] scheduleLocalNotification:localNotif]; [localNotif release]; </code></pre></li> <li>An app (with the user's permission) can register itself with a remote server (yours or a service provider) to receive push notifications delivered to it from you (via Apple's system). Once received, the App will optionally display a popup, play a sound, and/or change the badge on an applications icon. There is sample code in the Apple documentation for implementing the iPhone side of this, and also a few open source projects floating around for the server side. You can bypass having to implement your own server side by using a service like Urban Airship.</li> </ol>
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1. POiPhone app in the background
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1. USBrad The App Guy
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