针对iOS 6设备中出现的identifierForVendor及advertisingIdentifier返回全0或每次重启应用后变化的问题进行探讨。该问题被确认为iOS系统Bug，部分设备在从iOS 5.1直接OTA升级至6.1后会出现每次重启应用获取到的不同标识符。
[iOS] identifierForVendor和advertisingIdentifier为全0或者每次重启应用会变的bug
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最近发现有各别ios6的设备，取厂商id和广告id会有问题，问题1：取出来的是00000000-0000-0000-0000-000000000000这种全0的值；问题2：每次完全关闭应用程序，重新打开，取得的厂商id和广告id都会变。
查了一下，应该是ios系统的bug:
Apple confirmed this bug in their system in response to a Technical Support Incident request. They said thatidentifierForVendor and advertisingIdentifier sometimesreturning all zeros can be seen both in development builds and apps downloaded over the air from the App Store. They have no work around and can’t say when the problem will be fixed.
Update: Users that move directly from iOS 5.1 to 6.1 over-the-air experience a different behavior. Every time the app is closed completely and restarted, a new value is being returned byidentifierForVendor. This would be expected if the app was being uninstalled and reinstalled, but that’s not the case.
详见：http://stackoverflow.com/questions/12605257/the-advertisingidentifier-and-identifierforvendor-return-00000000-0000-0000-000
公司有一台6.1.2的iTouch就有这个问题，每次重启应用，取得的identifierForVendor和advertisingIdentifier都会变，通过ota升级到6.1.3后就没有问题了
原文地址：http://blog.csdn.net/n5/article/details/10441051
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最近发现有各别ios6的设备，取厂商id和广告id会有问题，问题1：取出来的是00000000-0000-0000-0000-000000000000这种全0的值；问题2：每次完全关闭应用程序，重新打开，取得的厂商id和广告id都会变。
查了一下，应该是ios系统的bug:
Apple confirmed this bug in their system in response to a Technical Support Incident request. They said thatidentifierForVendor and advertisingIdentifier sometimesreturning all zeros can be seen both in development builds and apps downloaded over the air from the App Store. They have no work around and can’t say when the problem will be fixed.
Update: Users that move directly from iOS 5.1 to 6.1 over-the-air experience a different behavior. Every time the app is closed completely and restarted, a new value is being returned byidentifierForVendor. This would be expected if the app was being uninstalled and reinstalled, but that’s not the case.
详见：http://stackoverflow.com/questions/12605257/the-advertisingidentifier-and-identifierforvendor-return-00000000-0000-0000-000
公司有一台6.1.2的iTouch就有这个问题，每次重启应用，取得的identifierForVendor和advertisingIdentifier都会变，通过ota升级到6.1.3后就没有问题了
原文地址：http://blog.csdn.net/n5/article/details/10441051
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