Save Login Keychain Swift

saveLogin.swift

func saveLogin(password: NSData, userName:String, service:String)
{
  //Create the query
  let keychainQuery: NSMutableDictionary = NSMutableDictionary(objects: [kSecClassGenericPasswordValue, service, userName, password], forKeys: [kSecClassValue, kSecAttrServiceValue, kSecAttrAccountValue, kSecValueDataValue])
        
  // Delete any existing items
  SecItemDelete(keychainQuery as CFDictionaryRef)
        
  //Add the query to the keychain
  let status: OSStatus = SecItemAdd(keychainQuery as CFDictionaryRef, nil)
  print(status)
}