If your apps use the MAC address to identify an iOS device, the system will return the same static value for all devices running iOS 7. Please update your apps to use the identifierForVendor property of UIDevice. If you need an identifier for advertising purposes, use the advertisingIdentifier property of ASIdentifierManager.
From: https://developer.apple.com/news/?id=8222013a
为应对iOS7系统返回相同静态MAC地址的问题,本文介绍了更新应用以使用UIDevice的identifierForVendor属性的方法,并推荐了对于广告目的使用ASIdentifierManager的advertisingIdentifier属性。
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