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https://developer.apple.com/library/ios/documentation/NetworkingInternetWeb/Conceptual/CoreBluetooth_concepts/CoreBluetoothBackgroundProcessingForIOSApps/PerformingTasksWhileYourAppIsInTheBackground.html
Core Bluetooth Programming Guide
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原文地址：http://www.cnblogs.com/killiancheung/p/4636378.html
