SecItemCopyMatching for Touch ID without passcode fallback
问题 I am using SecItemCopyMatching to fetch a keychain item protected by Touch ID. However, if Touch ID unlocking fails (or the user selects "Enter Passcode"), I want to present my own PIN-entry UI. I do not want the user to be presented with the system passcode entry UI at any point. LAContext 's evaluatePolicy method provides this, but does not offer any actual keychain security, merely local authentication. I therefore will not use LAContext to achieve this. Is this possible with