What’s New in iPhone OS - General

Whats New in iPhone OSThis document provides developer-level information about features that were introduced in different versions of iPhone OS. This document is not intended as a complete list of features for each new version of iPhone OS. Instead, it focuses on those features that affect the creation of third-party iPhone applications, providing overviews of each feature along with insight as to how and when you might use them to create your own software. Wherever possible, this document also provides links to other Apple conceptual and reference documentation for that feature.

This article summarizes the key features that are available beginning with iPhone OS 3.0. It also lists many of the documents that were created or updated for the release. For the latest updates and information, you should also see iPhone SDK Release Notes for iPhone OS 3.0.

Apple Push Notification Service
The Apple Push Notification Service provides a way to alert your users of new information, even when your application is not actively running. Using this service, you can push text notifications, trigger audible alerts, or add a numbered badge to your application icon. These messages let users know that they should open your application to receive the related information. From a design standpoint, there are two parts to making push notifications work for your iPhone applications. First, you need to request the delivery of notifications to your iPhone application and then you need to configure your application delegate to process them. The delegate works together with the shared UIApplication object to perform both of these tasks. Second, you need to provide a server-side process to generate the notifications in the first place. This process lives on your own local server and works with Apple Push Notification Service to trigger the notifications. For more information about how to configure your application to use remote notifications, see Apple Push Notification Service Programming Guide.
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