HiWhat is the best way to determine if an iPhone or iPad has a biometry sensor? The user may or may not have registered their face or fingerprint, regardless I would like to know what biometry sensor is on the device. My app targets iOS 11, so it has to be either Touch or Face.Many thanksCraig

Hi I have a custom UIView contained xib which is in an xcframework. The view has a timeout property which removes itself from the super view if it expiries. If the view does expiry, it fires a delegate which the function can observe using the KVC approach. What I'm experiencing is my function adds the view to the view controller ok, but doesn't display it until the function completes or throws an error. Here is a snippet of what I have described: // MARK: Contained in custom xcframework class MyView: UIView { var delegate: VerificationHandler? required init?(coder aDecoder: NSCoder) {         super.init(coder: aDecoder)         initialize()     }     override init(frame: CGRect) {         super.init(frame: frame)         initialize()     } func initialize() { let bundle = Bundle(for: type(of: self))      let uvNib = UINib(nibName: String(describing: type(of: self)), bundle: bundle)      let uvView = uvNib.instantiate(withOwner: self, options: nil).first as! UIView addSubview(uvView) Timer.scheduledTimer(withTimeInterval: TimeInterval(10), repeats: false) { [self] timer in             timer.invalidate()             delegate?.verification(didContinue: false)             removeFromSuperview()       } } } protocol VerificationHandler { func verification(didContinue: Bool) } class VerificationResult: NSObject {     @objc dynamic var value: Bool     init(_ value: Bool) {         self.value = value     } } public enum MyEnum { } public extension MyEnum { private static var verificationResult: VerificationResult = VerificationResult(false) public static func myFunction(_ viewController: UIViewController) throws -> MyObject { if let viewController = viewController { let view = MyView(frame: viewController.view.frame) view.delegate = self as? VerificationHandler viewController.view.addSubview(view)  let semaphore = DispatchSemaphore.init(value: 0) // observe the change occurring in the view which creates the verificationResult. var result: Bool let kvc = verificationResult.observe(\.value, options: .new) { _, change in result = change.newValue! // didContinue semaphore.signal() } semaphore.wait() if !result { throw MyError.timeout } return MyObject(...) } } extension MyEnum: VerificationHandler {     func verification(didContinue: Bool) {         MyEnum.verificationResult = VerificationResult(didContinue)     } } // MARK: View controller app code class ViewController: UIViewController { override func viewDidLoad() {     super.viewDidLoad() } @IBAction func onClick(_ sender: UIButton) { do { // this call is where the custom view from the xcframework should appear       let result = try MyEnum.myFunction(self)       }       catch let error {       print(error.localizedDescription)       } } } I'm using the semaphore to wait for the timer in MyView to fire which would cause the KVC to invoke. Not sure if this is the best way, but I'm blocked and can't figure out why the view only appears after an Error is thrown from myFunc. Any guidance appreciated.

Hi I want to prompt for FaceID or TouchID before creating the private key in the Secure Enclave. And again when the key is recreated. I might be misinterpreting the documentation wrong, but I thought passing in LAContext instance to the authenticationContext parameter does this for you in both create and recreate use cases. For example: swift let authContext = LAContext() let accessControl = SecAccessControlCreateWithFlags( nil, kSecAttrAccessibleWhenUnlockedThisDeviceOnly, [.privateKeyUsage, .biometryCurrentSet], nil)! let key0 = try! SecureEnclave.P256.Signing.PrivateKey( accessControl: accessControl, authenticationContext: authContext) let key1 = try! SecureEnclave.P256.Signing.PrivateKey( dataRepresentation: key0.dataRepresentation, authenticationContext: authContext) I was expecting a biometry prompt to appear twice, on create and on recreate CryptoKit operations - no authentication prompt appears on an iPhoneX 14.3 with FaceID enrolled and enabled. Same result in the simulator. Read a few articles all suggesting the above code snippet is what you need to do, but I'm not seeing the desired result. Appreciate any help with this 🙏