通过keychain进行保存UUID

- (NSString *)getUUID{

    

    NSError * error;

    NSString *strUUID=[SSKeychain passwordForService:keychain_service account:keychain_account];

    

    if (strUUID==nil||[strUUID isEqualToString:@"" ]||strUUID.length==0)

    {

        strUUID=[self get_uuid] ;

        BOOL  succcess=   [SSKeychain setPassword:strUUID forService:keychain_service account:keychain_account  error:&error];

        if(succcess)

        {

            NSLog(@"keychain success ");

        }

    }

    return strUUID;

    

}

- (NSString*)get_uuid{

    

    CFUUIDRef uuid_ref=CFUUIDCreate(nil);

    CFStringRef uuid_string_ref=CFUUIDCreateString(nil, uuid_ref);

    CFRelease(uuid_ref);

    NSString *uuid=[NSString stringWithString:(__bridge NSString *)(uuid_string_ref)];

    CFRelease(uuid_string_ref);

    return uuid;

 

}通过keychain进行保存UUID，并且再删除应用后UUID不变

demo下载地址：https://github.com/Winter0801/demo.git