How to add "Touch Id" with "In app Purchase" in Objective c? - ios

Question

I have successfully implemented "In App Purchase" in my project and now i am trying to implement a "Touch Id" to buy a product except asking a "Sign in to iTunes" popup. Here in my code it asks "touch id" and "Sign in to iTunes" popup both one after another, why this one wired both things i want only "touch id" to buy product. I have gone for IAP How do you add an in-app purchase to an iOS application? and for Touch ID How do i integrate Touch ID for my IAP? but not getting proper way to implement a touch id for IAP.Here is the code i have added,
Is this possible through code or it shows apple at the time of buying a product from app store.
Check above snapshot,
#import <LocalAuthentication/LocalAuthentication.h>
-(void) localAunthentication
{
//LocalAuthentication
LAContext *authContext = [[LAContext alloc] init];
NSError *authError = nil;
NSString *authLocalizedReasonString = #"Please aunthenticate to proceed";
if ([authContext canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&authError])
{
[authContext evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
localizedReason:authLocalizedReasonString
reply:^(BOOL success, NSError *error)
{
if (success)
{
// Allocated here for succinctness.
NSOperationQueue *operationQueue = [[NSOperationQueue alloc] init];
[operationQueue addOperationWithBlock: ^
{
}];
}
else
{
switch (error.code)
{
case LAErrorAuthenticationFailed:
//Authentication Failed
break;
case LAErrorUserCancel:
break;
case LAErrorUserFallback:
break;
default:
//Touch ID is not configured
break;
}
NSLog(#"%#",error.localizedDescription);
}
}];
}
else
{
}
}
What should i do to asks only "Touch Id" instead of "Sign in To iTunes" popup.

Answer 1

The iTunes Store controls what kind of authentication it presents, not your app. If necessary, an alert will be presented, otherwise the TouchID/FaceID overlay.
The reason you're never seeing the TouchID/FaceID overlay is that during development, your app is not using the real iTunes Store but a sandbox. The sandbox environment, AFAIK, always presents an alert.