Why is ViewDidLoad Called if I cancel TouchID prompt - objective-c

Question

When I press 'Cancel' on a TouchID prompt, the prompt disappears and the instantly reappears... My biometrics method is called inside ViewDidLoad, I added an NSLog inside ViewDidLoad and it is getting called when I dismiss the TouchID dialog. I've looked and tried several examples of how to implement TouchID, but all result in the same outcome.
- (void)useBiometrics{
LAContext* context = [[LAContext alloc] init];
NSError* error = nil;
NSString* result = #"Use Touch ID to login";
if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
[context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:result reply:^(BOOL success, NSError *error) {
if (success) {
dispatch_async(dispatch_get_main_queue(), ^{
UIStoryboard *storyboard=[UIStoryboard storyboardWithName:#"Main" bundle:[NSBundle mainBundle]];
LoginViewController *loginController = [storyboard instantiateViewControllerWithIdentifier:#"ViewControllerROOTIdentifier"];
[self.navigationController pushViewController:loginController animated:NO];
FROM_LOGIN = YES;
NEEDS_LOGIN = FALSE;
});
}
else
{
switch (error.code) {
case LAErrorSystemCancel:
{
break;
}
case LAErrorUserCancel:
{
NSLog(#"TouchID canceled");
break;
}
case LAErrorAuthenticationFailed:
{
break;
}
case LAErrorPasscodeNotSet:
{
break;
}
case LAErrorBiometryNotAvailable:
{
break;
}
case LAErrorBiometryNotEnrolled:
{
break;
}
case LAErrorUserFallback:
{
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
}];
break;
}
default:
{
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
}];
break;
}
}
}
}];
}
else
{
switch (error.code) {
case LAErrorBiometryNotEnrolled:
{
break;
}
case LAErrorPasscodeNotSet:
{
NSLog(#"A passcode has not been set");
break;
}
default:
{
NSLog(#"TouchID not available");
break;
}
}
}
}