prepareInterface(for:)
Prepares the interface to display a prompt to save a password credential.
Declaration
func prepareInterface(for savePasswordRequest: ASSavePasswordRequest)Discussion
The system calls this method to tell your extension’s view controller to prepare to present a prompt to save a password credential. After calling this method, the system presents the view controller to the user.
Upon success, call completeSavePasswordRequest(completionHandler:).
Always provide a way for someone to cancel the operation from your view controller, for example, by including a Cancel button in the navigation bar. When someone cancels the operation, call ASCredentialProviderExtensionContext/cancelRequest(with:), using userCanceled.