screen lock - Programmatically detect whether iOS passcode is enabled or not

Question

Rather than build a passcode directly into my app and potentially require the user to enter a passcode twice (once for the device and again for my app); I thought I might out-clever myself and do something along the lines of:

if (device has passcode)
    continue into my app
else
    make user enter my app passcode

I don't want to set the device passcode, I don't want to force a screen lock, not encrypting anything - all I really want is an API just to detect if a device passcode is in effect. Something like:

BOOL notReally = [UIDevice isUserSlightlyMoreSecureBecauseTheySetDeviceLockOn];

or maybe if I'm feeling lucky:

BOOL isPasscodeEnabled = [UIDevice isPasscodeEnabled];
BOOL isSimplePasscode = [UIDevice isSimplePasscode];
NSInteger minutes = [UIDevice requirePasscodeAfter];

I'm guessing not based on this question (but is a few years old) "programmatically check for iPhone's Passcode in settings bundle" or this might be the answer; "Lock Unlock events iphone" which isn't exactly what I want but might work "after the fact".

Answer 1

For iOS 9+ you can detect it using the new LocalAuthentication class, and it works on Simulator as well as devices:

import LocalAuthentication

private func devicePasscodeSet() -> Bool {
    //checks to see if devices (not apps) passcode has been set
    return LAContext().canEvaluatePolicy(.deviceOwnerAuthentication, error: nil)
  }