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POiPhone alarm using repeated local notifications
 

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    <p>I'm trying to add an in-background alarm clock feature to an app I'm developing.</p> <p>I have read up on the <code>UILocalNotification</code> object and its use, and am aware that it is limited to 30 seconds of audio.</p> <p>I was thinking of scheduling multiple notifications (say, 5 of them) spaced 30 seconds apart to mimic continuous play, but the problem with this approach is that if the user hits <code>Close</code>, I won't be able to cancel any of the subsequent notifications.</p> <p>As far as I know, it is impossible to remove or hide the <code>Close</code> button without hiding the notification entirely (i.e., setting the <code>alertBody</code> property to <code>Nil</code>).</p> <p>So, I thought I might use the <code>repeatInterval</code> property to cause the notification to pop up every 30 seconds, but it seems that I can only set the interval to one minute or one second, and nothing in between.</p> <p>The feature is meant to allow the user to choose between music and beeps for alarm audio; it seems I may have found a way to do the beeps - setting the <code>repeatInterval</code> to one second, create a second's worth of beeps (which would need to be timed to cleanly repeat) and use that as the notification sound.</p> <p>However, for the music, this approach limits me to playing 30 seconds of audio, followed by a 30-second gap, followed by 30 seconds of audio, and so on.</p> <p>I know that there is no straightforward solution here, from my reading of other posts and resources; no third-party app has access to the same functionality as the built-in alarm clock. I am hoping that someone has found a workaround or thinks of something really clever.</p> <p>UPDATE: I have found that the <code>repeatInterval</code> doesn't help me in this case, as I can't cancel the repetitions without launching the app.</p> <p>For the time being I have decided not to use a notification as an alarm per se, but have changed the feature to be a reminder (more along the lines of what the notification is intended for).</p> <p>If I come up with a way to implement user-friendly, reliable alarm functionality to an app, I will update this post.</p>
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    1. CO"multiple notifications (say, 5 of them) spaced 30 seconds apart to mimic continuous play" - it just won't work this way 'cause LocalNotification precision limited to one minute...
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      1. USOleg Trakhman
    2. COConsider using background execution in your app. As far as I know apps can play music in background.
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    3. COHere's an example of how someone built the local notification background alarm you allude to: http://stackoverflow.com/a/4197215/1264925
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