iOS 4 in Action

Developing iPhone & iPad Apps
By Jocelyn Harrington, Brandon Trebitowski, Christopher Allen, and Shannon Appelcline
An application can receive location updates to support a location-related task or navigation in the background, such as significant location change service and turn-by-turn directions. In this article, based on chapter 22 of iOS 4 in Action, the authors build a demo application that tracks location updates in the background.

When an application needs to continue running in the background, these multitasking features are available on iOS 4:

• Audio—The application can continue running and play audio to the user while in the background. The user can use the multitasking UI or the lock screen UI to remote control the audio play, pause, fast-forward, and so on.
• Location—The application can receive location updates to support a location-related task or navigation in the background, such as significant location change service and turn-by-turn directions.
• VoIP—Allows the application to receive voice calls through the Internet while other applications are in the foreground.

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Product Details

• Paperback: 504 pages
• Publisher: Manning Publications; 1 edition (June 16, 2011)
• Language: English
• ISBN-10: 1617290017
• ISBN-13: 978-1617290015
• Product Dimensions: 3.6 x 2.9 x 0.4 inches
• Shipping Weight: 1.8 pounds