How do you improve the speed of LoginAuthentication? - ios

Question

I'm working on adding the LocalAuthentication framework to allow users to authenticate with a fingerprint on comparable devices. Everything works properly, but when a user is authenticated with their finger print it takes between 10-15 seconds for the proper segue to be performed, is this typical, or is there something wrong with the way I'm authenticating a user?
Code:
-(void)viewDidLoad { [super viewDidLoad]; [self.view setBackgroundColor:[NPSColor NPSBackgroundColor]];
UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithTitle:#"Register" style:UIBarButtonItemStylePlain target:self action:#selector(onRegisterTapped)]; self.navigationItem.rightBarButtonItem = anotherButton;
LAContext *context = [[LAContext alloc] init];
NSError *error = nil; if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) { [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:#"Login?" reply:BOOL success, NSError *error {
if (error) {
}
if (success) {
[self performSegueWithIdentifier:#"loginSeg" sender:self];
} else {
}
}];
} else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error"
message:#"Your device cannot authenticate using TouchID."
delegate:nil
cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
[alert show];
} }

Answer 1

So it may be that performing a segue has to do with a view action which should mainly be performed on the main thread. I'm not too sure but it could very well be the evaluatePolicy method is performed on a background thread. If this is the case, you would want to throw your performSegue on the main thread.
To do so, use this:
dispatch_async(dispatch_get_main_queue(), ^{
[self performSegueWithIdentifier:#"loginSeg" sender:self];
});