Determine if an iOS device supports TouchID without setting passcode

Question

I\'m currently developing an iOS app that enables users to log in to the app using TouchID, but firstly they must set up a password inside the app first. Problem is, to show

Answer 1

The correct way to detect if TouchID is available:

BOOL hasTouchID = NO;
// if the LAContext class is available
if ([LAContext class]) {
    LAContext *context = [LAContext new];
    NSError *error = nil;
    hasTouchId = [context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error];
}

Sorry it is in Objective-C, you might have to translate it to C#.

You should refrain from checking the system version and just check whether or not the class or methods are available.