获取唯一设备ID

[[[UIDevice currentDevice] identifierForVendor] UUIDString]；
根据APP供应商分配，APP卸载重装后，会重新生成。
需要通过keychain存储配合使用。

@interface YLKeyChainStore : NSObject
/**保存数据至钥匙串中*/

• (void)save:(NSString)service data:(id)data;
  /**从钥匙串中加载数据/
• (id)load:(NSString)service;
  /**删除数据/
• (void)deleteKeyData:(NSString)service;
  /** 获取UUID/
• (NSString *)getUUIDByKeyChain;
  @end

/**通过 key 获取数据*/

• (NSMutableDictionary)getKeychainQuery:(NSString)service {
  service = [self handleServiceKeyWith:service];
  return[NSMutableDictionary dictionaryWithObjectsAndKeys:
  (id)kSecClassGenericPassword,(id)kSecClass,
  service,(id)kSecAttrService,
  service,(id)kSecAttrAccount,
  (id)kSecAttrAccessibleAfterFirstUnlock,(id)kSecAttrAccessible,
  nil];
  }

• (NSString)handleServiceKeyWith:(NSString)service {
  return [NSString stringWithFormat:@"%@%@",AppBundleID(),service];
  }

• (void)save:(NSString)service data:(id)data{
  //Get search dictionary
  NSMutableDictionarykeychainQuery = [self getKeychainQuery:service];
  //Delete old item before add new item
  SecItemDelete((CFDictionaryRef)keychainQuery);
  //Add new object to searchdictionary(Attention:the data format)
  [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data]forKey:(id)kSecValueData];
  //Add item to keychain with the searchdictionary
  SecItemAdd((CFDictionaryRef)keychainQuery,NULL);
  }

• (id)load:(NSString)service {
  id ret =nil;
  NSMutableDictionarykeychainQuery = [self getKeychainQuery:service];
  //Configure the search setting
  //Since in our simple case we areexpecting only a single attribute to be returned (the password) wecan set the attribute kSecReturnData to kCFBooleanTrue
  [keychainQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];
  [keychainQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];
  CFDataRef keyData =NULL;
  if(SecItemCopyMatching((CFDictionaryRef)keychainQuery,(CFTypeRef)&keyData) ==noErr){
  @try{
  ret =[NSKeyedUnarchiver unarchiveObjectWithData:(__bridge NSData)keyData];
  }@catch(NSException *e) {
  NSLog(@"Unarchiveof %@ failed: %@",[self handleServiceKeyWith:service], e);
  }@finally{
  }
  }
  if(keyData)
  CFRelease(keyData);
  return ret;
  }

• (void)deleteKeyData:(NSString)service {
  NSMutableDictionarykeychainQuery = [self getKeychainQuery:service];
  SecItemDelete((CFDictionaryRef)keychainQuery);
  }

/** 获取UUID*/

• (NSString )getUUIDByKeyChain {
  NSStringkey = @"uuid";
  // 这个key的前缀最好是你的BundleID
  NSStringstrUUID = (NSString)[YLKeyChainStore load:key];
  //首次执行该方法时，uuid为空
  if([strUUID isEqualToString:@""] || !strUUID)
  {
  strUUID = [[[UIDevice currentDevice] identifierForVendor] UUIDString];
  //将该uuid保存到keychain
  [YLKeyChainStore save:key data:strUUID];
  }
  return strUUID;
  }