Henning Hoffmann henning-jh

Keybase proof

I hereby claim:

I am henning-jh on github.
I am henningh (https://keybase.io/henningh) on keybase.
I have a public key ASAmRDGCvjc8UVEqP98qf_-JdHy8LLdSl1AQzjusIHO6rwo

To claim this, I am signing this object:

Just as a reference, here's a UICollectionView with some nice evenly spaced cells.

class ViewController: UIViewController, UICollectionViewDataSource /*, UICollectionViewDelegate */ {

	let kReuseIdentifier = "CollectionCellID"
	let kNumCellsPerRow:CGFloat = 3.0
	let kSpacer:CGFloat = 10.0
	var collectionView : UICollectionView!

	let center = NotificationCenter.default
	let name = NSNotification.Name.ASAuthorizationAppleIDProviderCredentialRevoked
	let observer = center.addObserver(forName: name, object: nil, queue: nil) { (notification) in
	// sign user out
	// optionally guide them to sign in again
	}

	let userIdentifier = // get saved userIdentifier - sample app uses Keychain
	appleIDProvider.getCredentialState(forUserID: userIdentifier) { (credentialState, error) in
	switch credentialState {
	case .authorized:
	// The Apple ID credential is valid.
	break
	case .revoked:
	// The Apple ID credential is revoked.
	break
	case .notFound:

	extension MyLoginViewController: ASAuthorizationControllerDelegate {
	func authorizationController(controller: ASAuthorizationController,
	didCompleteWithAuthorization authorization: ASAuthorization) {
	if let appleIDCredential = authorization.credential as? ASAuthorizationAppleIDCredential {

	let userIdentifier = appleIDCredential.user
	let fullName = appleIDCredential.fullName
	let email = appleIDCredential.email

	// Now we have the account information.

	extension MyLoginViewController: ASAuthorizationControllerDelegate {
	func authorizationController(controller: ASAuthorizationController,
	didCompleteWithError error: Error) {
	// Handle error.
	}
	}

	/// Prompts the user if an existing iCloud Keychain credential or Apple ID credential is found.
	func performExistingAccountSetupFlows() {
	// Prepare requests for both Apple ID and password providers.
	let requests = [ASAuthorizationAppleIDProvider().createRequest(),
	ASAuthorizationPasswordProvider().createRequest()]

	// Create an authorization controller with the given requests.
	let authorizationController = ASAuthorizationController(authorizationRequests: requests)
	authorizationController.delegate = self
	authorizationController.presentationContextProvider = self

	extension MyLoginViewController: ASAuthorizationControllerPresentationContextProviding {
	func presentationAnchor(for controller: ASAuthorizationController) -> ASPresentationAnchor {
	return self.view.window!
	}
	}

	@objc
	func handleAuthorizationAppleIDButtonPress() {
	let request = ASAuthorizationAppleIDProvider().createRequest()
	request.requestedScopes = [.fullName, .email]

	let authorizationController =
	ASAuthorizationController(authorizationRequests: [request])
	authorizationController.delegate = self
	authorizationController.presentationContextProvider = self
	authorizationController.performRequests()

	import AuthenticationServices

	func createButton() {
	let authorizationButton = ASAuthorizationAppleIDButton()
	authorizationButton.addTarget(self, action:
	#selector(handleAuthorizationAppleIDButtonPress),
	for: .touchUpInside)
	myView.addSubview(authorizationButton)
	}