Apple對UDID廢棄的聲明早從iOS4開始，iOS5中需要慎重使用。而在iOS6中終于提供了UDID的替代產(chǎn)品identifierForAdvertising和identifierForVendor。Apple對其的描述如下：

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@property(nonatomic,readonly,retain) NSUUID *identifierForAdvertisingNS_AVAILABLE_IOS(6_0);// a UUID that may be used to uniquely identify the device for advertising purposes, same across apps.

Note: identifierForAdvertising會在系統(tǒng)reset時重新生成。

@property(nonatomic,readonly,retain) NSUUID *identifierForVendorNS_AVAILABLE_IOS(6_0);// a UUID that may be used to uniquely identify the device, same across apps from a single vendor.