I'm currently doing the FaceID authentication portion of the BucketList project and I can't seem to make the FaceID permission prompt to appear in the Simulator. When I checked context.canEvaluatePolicy(...), it kept returning false and as a result, context.evaluatePolicy(...) was not called.

• I've already added the Privacy - FaceID Usage Description row in the Info section of the project target
• The Enrolled option in the Features > FaceID is already toggled on
• I've also rebuild and rerun app as well

I think I might be missing something because weirdly enough, sometimes (very rarely) the prompt does appear but when I run the app again, it's not there anymore.

Here's the code:

import SwiftUI
import MapKit
import LocalAuthentication

struct ContentView: View {
    @State private var isUnlocked = false

    func authenticate() {

        let context = LAContext()

        var error: NSError?

        print(context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error))

        if context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error) {
            let reason = "We need to unlock your data."

            context.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics , localizedReason: reason) { success, authenticationError in

                if success {

                } else {

                }

            }

        } else {
            print(context.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: &error))

            }}

    var body: some View {
        VStack {
            if isUnlocked {
                Text("Unlocked")
            } else {
                Text("Locked")
            }
        }.onAppear(perform: authenticate)

    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

Okay, I somehow got it to work.

Before, I was simulating iPhone 13 Pro; but when I tried iPhone 13 and iPhone 13 Pro Max instead, both worked fine and the prompt appeared.

Weird but moving on.