Touchid and faceid~2

TouchID and FaceId  Error code explain

typedef NS_ENUM(NSInteger, LAError)
{
    LAErrorAuthenticationFailed,   // -1 Error validating information , That means your fingerprints are wrong 
    LAErrorUserCancel              // -2 User canceled authentication 
    LAErrorUserFallback            // -3 The user clicked the button to enter the password manually , So it was canceled 
    LAErrorSystemCancel            // -4 Cancelled by the system , That is to say, you are now entering other applications , Not on the page just now , So there's no way to verify 
    LAErrorPasscodeNotSet          // -5 The user has not set TouchID
    LAErrorTouchIDNotAvailable     // -6 User equipment does not support TouchID
    LAErrorTouchIDNotEnrolled      // -7 The user has not set finger fingerprint 
    LAErrorTouchIDLockout          // -8 Too many user errors , Now it's locked 
    LAErrorAppCancel               // -9 By others in the verification app interrupt 
    LAErrorInvalidContext          // -10 Request validation error 
} NS_ENUM_AVAILABLE(10_10, 8_0);

LAPolicy It's an enumeration , There are two values

LAPolicyDeviceOwnerAuthenticationWithBiometrics //  Use finger prints to verify ,iOS8.0 The above can be used 
LAPolicyDeviceOwnerAuthentication //  Use TouchID Or password verification , The default is after three wrong fingerprints or locks , The password input interface pops up iOS 9.0 The above can be used 

The first enumeration value , User authentication failed 3 Time , Error code will be returned LAErrorAuthenticationFailed, If validation fails 5 The error code will be returned for the second time LAErrorTouchIDLockout And the fingerprint verification function is locked . If you cancel the system password verification , Next time you turn on the fingerprint verification function, you will find that there is no fingerprint verification function .

The second enumeration value , User authentication failed 3 The system password verification will pop up automatically , If the system password is verified successfully . If you cancel the system password verification , Next time you turn on the fingerprint verification function, the system password will still be verified , Instead of verifying fingerprints .