kSecAttrIsNegative
A key with a value that’s a Boolean indicating whether the item has a valid password.
Declaration
let kSecAttrIsNegative: CFStringDiscussion
The corresponding value is of type CFBoolean and indicates whether there is a valid password associated with this keychain item. This is useful if your application doesn’t want a password for some particular service to be stored in the keychain, but prefers that it always be entered by the user.