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Beginning iOS 4 Application Development by Wei-Meng Lee

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Chapter 19. Apple Push Notification Service

WHAT YOU WILL LEARN IN THIS CHAPTER

  • How to use the Apple Push Notification service

  • Generating a certificate request

  • Generating a development certificate

  • How to create an App ID

  • How to configure an App ID for push notification

  • Creating a provisioning profile

  • How to provision a device

  • How to deploy an iPhone application onto a device

  • Using a push notification provider application

One of the key limitations of the iPhone is its constraint on running applications in the background, which means that applications requiring a constant state of connectivity (such as social networking applications) will not be able to receive timely updates when the user switches to another application.

Note

Chapter 21 discusses the new multi-tasking feature of iOS 4. While you now have the ability to run your application in the background, the types of applications that are allowed to do so are limited. Also, applications running in the background are not allowed to have any network connectivity.

To overcome this limitation, Apple released the Apple Push Notification service (APNs). The APNs enable 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.

When your iPhone application uses the Apple Push Notification service, the ...

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