In order to insure a smooth transition, they introduced an ist key, named UIApplicationExitsOnSuspend, which allowed developers to opt-out of the multitasking behavior. With iOS4, Apple changed all that, so that when you switch apps, the current app would just go in a background state before being suspended. Back then if you switched an app, that app was killed and the new one was launched. Some of you might remember a dark time when iOS had no multitasking. There are four methods to actually implement an alarm behavior in your app and we’ll go through them all. The issue with implementing a robust alarm app on iOS is reliably getting a sound notification to the user when the app’s not running, the ringer set to vibrate and the sound all the way down and that’s what we’ll focus on. Whether you choose to go with a timer, local notification or something else – it doesn’t really matter. We’ll actually skip the simplest part of the alarm app – the actual alarm code itself, since it’s pretty straightforward. Right off the bat, I have to warn you that this kind of functionality isn’t something that’s approved by Apple and we’ll be implementing a questionable method, that has been proven to be AppStore approved, based on the dozen of apps that are doing just that. In this post, we’ll go through how you can build an alarm app for iOS.
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