One of the key limitations of the iPhone is its constraint on running applications in the background. Because of this, applications cannot keep running in the background when the user switches to another application. So, applications that r...
www.mobiforge.com/developing/story/programming-apple-push-notification-services
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This is a post by iOS Tutorial Team member Matthijs Hollemans, an experienced iOS developer and designer. In iOS, apps can't do a lot in the background.
www.raywenderlich.com/3443/apple-push-notification-services-tutorial-part-12
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