The localized title for the fallback button in the dialog presented to the user during authentication.
- iOS 8.0+
- macOS 10.10+
- UIKit for Mac 13.0+Beta
The system presents a fallback button when biometric authentication fails—for example, because the system doesn’t recognize the presented finger, or after several failed attempts to recognize the user’s face. Tapping the button lets the user revert to authentication using the device passcode or password instead.
localized property to set a title for the fallback button. When the property is
nil—as it is by default—the user sees an appropriate default title, like “Use Passcode”. Otherwise, provide a localized string that’s short and clear.
To eliminate the fallback option, set the fallback title to an empty string. This hides the button from the interface.