How to repeat local notifications every day at different times

Question

I\'m working on a prayers application that enables users to set an alarm(local notification) for prayer times, i.e. the user sets the application to notify him for Fajr pray

Answer 1

So the problem appears you need to be setting this local notification every now and then, but can't be a repeatable notification. I assume the user sets the prayer time, and wants to be notified. I suggest you set a few of them, since you know from the list. Then set background fetch for let say every 5 hours, and upon app background launch, just check what local notifications are still set, and update the list accordingly based on the current date. Background fetch doesn't wake your app precisely every 5 hours in this case, but will do its best. I'm sure your app will wake up at least twice a day. You can tweak the time based on your needs.

Fetching Small Amounts of Content Opportunistically Apps that need to check for new content periodically can ask the system to wake them up so that they can initiate a fetch operation for that content. To support this mode, enable the Background fetch option from the Background modes section of the Capabilities tab in your Xcode project. (You can also enable this support by including the UIBackgroundModes key with the fetch value in your app’s Info.plist file.) Enabling this mode is not a guarantee that the system will give your app any time to perform background fetches. The system must balance your app’s need to fetch content with the needs of other apps and the system itself. After assessing that information, the system gives time to apps when there are good opportunities to do so. When a good opportunity arises, the system wakes or launches your app into the background and calls the app delegate’s application:performFetchWithCompletionHandler: method. Use that method to check for new content and initiate a download operation if content is available. As soon as you finish downloading the new content, you must execute the provided completion handler block, passing a result that indicates whether content was available. Executing this block tells the system that it can move your app back to the suspended state and evaluate its power usage. Apps that download small amounts of content quickly, and accurately reflect when they had content available to download, are more likely to receive execution time in the future than apps that take a long time to download their content or that claim content was available but then do not download anything.

For more information refers to Apple's documentation on background execution:

https://developer.apple.com/library/ios/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html