Explain iBeacons in iOS.

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iBeacon, Apple’s new low-energy Bluetooth wireless technology, permits iPhone and other iOS users to receive location-based information and services on smartphones. iBeacons are small, wireless transmitters that convert signals to nearby smart devices via Bluetooth low energy technology.

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Define the function of the completion handler.
Define the function of the completion handler. -

Completion handlers are just functions passed as parameters to other function...

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