ios IDFV存储在钥匙串中

Question

i need Device ID which never change, i try UDID but is not available in IOS 6/7/8 so , i try With IDFV I've store IDFV in keychain which same after uninstalling app

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

stored that idfv to the Keychain using SSKeyChain

When I "Reset content and settings" all stored data in keychain is deleted, and create new IDFV . I am new in IOS So I don't know how and where store my string which save my ID permanently.

Answer 1

You don't, Apple made sure that what you want is not possible, no accessible UDID, MAC address or any other unique device identifiers are available thru the official iOS SDK. Storing an unique identifier in the keychain is your only option.

Create UUID with the help of NSUUID and store it in the keychain.

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But the main question is why do you want to identify the device, even after the app is uninstalled. There should be no need for it. If you are going to identify the user by this unique identifier then you will run into a lot of issue later on. Just take in mind that if the user sells it's device and the new user installs the same app the user will identified as the previous owner. Since the device identifier did not change, I've had this happen with some apps.