June 2011
Intermediate to advanced
590 pages
19h 31m
English
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29Push Notifications and Networking
On an iOS device, only one application can run in the foreground at a time. Sometimes, you want an application that isn’t currently running to notify you when something happens: an opponent in a game makes a move, a buddy sends you a message in a chat program, or you have 5 minutes to get to your next meeting.
Push notifications are one approach to solving this problem. A push notification is a message sent from Apple’s servers to a device. The user sees a pop-up window on screen with the name of the application that has been notified, a message, and possibly an alert sound or icon badge.
It’s not a coincidence that it is difficult to find a working implementation of push notifications on the Net – this stuff ...
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