WHAT YOU WILL LEARN IN THIS CHAPTER
One of the key limitations of iOS is its constraint on running applications in the background, which means that applications requiring a constant state of connectivity (such as social networking applications) cannot receive timely updates when the user switches to another application.
To overcome this limitation, Apple uses the Apple Push Notification service (APNs). The APNs enables your device to remain connected to Apple's push notification server (PNS). When you want to send a push notification to an application installed on the users' devices, you (the provider) can contact the APNs so that it can deliver a push message to the particular application installed on the intended device.
In this chapter, you will learn how to use the APNs to push messages to users who have installed your application.
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