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Explain iOS multitasking?


multitasking is supported through seven background APIs:

Background audio – application continues to run in the background as long as it is playing audio or video content
Voice over IP – application is suspended when a phone call is not in progress
Background location – application is notified of location changes
Push notifications
Local notifications – application schedules local notifications to be delivered at a predetermined time
Task completion – application asks the system for extra time to complete a given task
Fast app switching – application does not execute any code and may be removed from memory at any time

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