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IOS Push notification triggered by variable crossing user-defined limit

You would want this to be done server-side. So the user within the app would configure what price they want the trigger to happen at, and you would send this information to your server. Then your server would send them a push notification when this condition is met. You would not want the app doing frequent requests to the server, or be kept running constantly in the background.

There are services such as Parse and Urban Airship that can handle the push notifications side of things for you. You'll have to set up other stuff in order to be able to determine when to send them and such, but these services will help you.

I would recommend finding tutorials on PHP, since that would be useful to know. But also you should find tutorials on integrating and using Parse and Urban Airship (I would probably recommend Parse over Urban Airship, but it's your choice).

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