touch id note 

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LAContext *lol = [[LAContext alloc] init];
       
       NSError *error = nil;
       NSString *message = @"message";
       
       if ([lol canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
           [lol evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:message reply:^(BOOL succes, NSError *error)
            {
                if (succes) {
                    //do something
                } else {
                }
            }];
       } else {
       }