• UUID
  • UDID

developer.apple.com 做法

uniqueidentifier (Deprecated in iOS 5.0, Available in iOS 2.0 through iOS 6.1)

CFUUIDCreate()  version 1-4 UUID  重装之后会生产新的

－［UIDevice identifierForVendor］ iOS 6, iOS 7

iOS 7 中查询MAC地址返回的是固定值(02:00:00:00:00:00)

网友做法

OpenUDID
device mac-address and bundle identifier
iCloud key/value store