//指纹验证返回值 typedef NS_ENUM(NSInteger, LAError) { /// Authentication was not successful, because user failed to provide valid credentials. LAErrorAuthenticationFailed = kLAErrorAuthenticationFailed, /// Authentication was canceled by user (e.g. tapped Cancel button). LAErrorUserCancel = kLAErrorUserCancel, /// Authentication was canceled, because the user tapped the fallback button (Enter Password). LAErrorUserFallback = kLAErrorUserFallback, /// Authentication was canceled by system (e.g. another application went to foreground). LAErrorSystemCancel = kLAErrorSystemCancel, /// Authentication could not start, because passcode is not set on the device. LAErrorPasscodeNotSet = kLAErrorPasscodeNotSet,
/// Authentication could not start, because Touch ID is not available on the device. LAErrorTouchIDNotAvailable = kLAErrorTouchIDNotAvailable, /// Authentication could not start, because Touch ID has no enrolled fingers. LAErrorTouchIDNotEnrolled = kLAErrorTouchIDNotEnrolled,
/// Authentication was not successful, because there were too many failed Touch ID attempts and /// Touch ID is now locked. Passcode is required to unlock Touch ID, e.g. evaluating /// LAPolicyDeviceOwnerAuthenticationWithBiometrics will ask for passcode as a prerequisite. LAErrorTouchIDLockout NS_ENUM_AVAILABLE(10_11, 9_0) = kLAErrorTouchIDLockout,
/// Authentication was canceled by application (e.g. invalidate was called while /// authentication was in progress). LAErrorAppCancel NS_ENUM_AVAILABLE(10_11, 9_0) = kLAErrorAppCancel,
/// LAContext passed to this call has been previously invalidated. LAErrorInvalidContext NS_ENUM_AVAILABLE(10_11, 9_0) = kLAErrorInvalidContext } NS_ENUM_AVAILABLE(10_10, 8_0);