iOS唯一设备标识策略

1.CFUUID

- (NSString *)cfuuid {
    CFUUIDRef uuid_ref = CFUUIDCreate(kCFAllocatorDefault);
    NSString *uuid = CFBridgingRelease(CFUUIDCreateString(kCFAllocatorDefault, uuid_ref));
    CFRelease(uuid_ref);
    return uuid;
}

 iOS5-  UDID    Unique Device Identifier    NSString *udid = [[UIDevice currentDevice] uniqueIdentifier];

    1）从iOS5.0（2011-08）开始，苹果宣布不再支持用uniqueIdentifier方法获取设备的UDID；

    2）在2013-03-21日苹果通知开发者：从2013-05-01起，使用UDID的程序不再被审核通过；

 UUID   Universally Unique Identifier (CFUUID NSUUID)

 OPEN UDID          NSString *openUDID = [OpenUDID value];

 iOS6+

    IDFA-identifierForIdentifier    NSString *adId = [[[ASIdentifierManager sharedManager] advertisingIdentifier] UUIDString]

    IDFV-identifierForVendor        NSString *idfv = [[[UIDevice currentDevice] identifierForVendor] UUIDString];

 iOS7+ MAC Address "02:00:00:00:00:00"

 推送token + bundleid

 KeyChain