13. Push Notifications
When off-device services need to communicate directly with users, push notifications provide a solution. Just as local notifications allow apps to contact users at scheduled times, push notifications deliver messages from web-based systems. Push notifications let devices display an alert, play a custom sound, or update an application badge. In this way, off-device services connect with an iOS-based client, letting them know about new data or updates.
Unlike most other iOS development arenas, nearly all the push story takes place off the device. Developers create web-based services to manage and deploy information updates. Push notifications transmit those updates to specific devices. In this chapter, you learn how push ...
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