fingerprint.m

#import <LocalAuthentication/LocalAuthentication.h>

/* A very simple way to scan your fingerprint... */
- (IBAction)didPressScan:(UIButton *)sender {
    NSLog(@"Hallo...!");
    
    LAContext *myContext = [[LAContext alloc] init];
    NSError *authError = nil;
    NSString *myLocalizedReasonString = @"Used for quick and secure access to the Remob app :P";
    
    if ([myContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&authError]) {
        [myContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
                  localizedReason:myLocalizedReasonString
                            reply:^(BOOL success, NSError *error) {
                                if (success) {
                                    // User authenticated successfully, take appropriate action
                                    NSLog(@"Yes baby! Fingerprint scanned!");
                                } else {
                                    // User did not authenticate successfully, look at error and take appropriate action
                                    NSLog(@"Damn you! I failed to defeat the dragon claw!");
                                }
                            }];
    } else {
        // Could not evaluate policy; look at authError and present an appropriate message to user
        NSLog(@"Say what! No authentication?!");
    }
}