Can you detect which component was tapped in an Intents UI extension? - ios

I have a UI extension for a Siri Shortcut and the I want the view I'm displaying within Siri to do different things when different parts are clicked. For example, I am displaying some contact information for a contact from a different system, and I'd like to call the phone number when the phone number is clicked, and to open the map with directions when the address is clicked. I'm able to detect when the app is opened because anything in the view was clicked, but I can't detect the specific element that was clicked.
This is the gist of my code, with parts removed for brevity.
class IntentViewController: UIViewController, INUIHostedViewControlling {
func configureView(for parameters: Set<INParameter>, of interaction: INInteraction, interactiveBehavior: INUIInteractiveBehavior, context: INUIHostedViewContext, completion: #escaping (Bool, Set<INParameter>, CGSize) -> Void) {
let viewSize = configureUI(with: intent, of: interaction)
completion(true, [], viewSize)
}
private func configureUI(with intent: PersonInfoIntent, of interaction: INInteraction) -> CGSize {
let vc = UIViewController()
addChild(vc)
view.addSubview(vc.view)
let nameLabel = UILabel(text: name)
vc.view.addSubview(nameLabel)
let phoneLabel = UILabel(text: phoneNumber)
vc.view.addSubview(phoneLabel)
let addressLabel = UILabel(text: address)
vc.view.addSubview(address)
// This does not result in openMap being called
// let addressTapped = UITapGestureRecognizer(target: self, action: #selector(openMap))
// addressLabel.addGestureRecognizer(addressTapped)
return self.extensionContext!.hostedViewMaximumAllowedSize
}
}
I've tried using a UIButton and addTarget rather than a UILabel with a gesture recognizer, but that also never triggers openMap.
I'd like to be able to detect which element was tapped so I can set it on my activity.userInfo and pick it up in my AppDelegate.application(_:,continue:,restorationHandler:), where I can perform actions like opening the map with directions, or calling a phone number.

Related

iOS Contextual Menu API can't display Link Presentation content

I am attempting to display the preview, using the LinkPresentation API, of a website inside of a UIContextualMenu when the user force or long presses on a link, similar to how peek and pop used to work for links. However, the LP API loads the metadata from the website asynchronously, and when I force touch on the link, the preview controller displayed by the context menu is blank. The following is the delegate method for the UIContextMenuConfiguration:
public func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
guard let url = shouldShowContextualMenu(location: location) else { return nil }
return UIContextMenuConfiguration(identifier: nil, previewProvider: { () -> UIViewController? in
self.getMetadataForUrl(url: url ) { linkView in
self.previewController = LinkPreviewViewController(linkView: linkView)
}
return self.previewController
}, actionProvider: nil)
}

Get id of button from webview on tap in swift

I have a webview in which I load a url coming from a backend server. There is a button in my webview on which when user tap I want to get the id of that button. How I can get the id of that button? I have used a tap gesture on which when I click I'm trying to get the id but it's not working, my code is this,
let webViewTapped = UITapGestureRecognizer(target: self, action: #selector(self.tapAction(_:)))
webViewTapped.numberOfTapsRequired = 1
webViewTapped.delegate = self
webView.addGestureRecognizer(webViewTapped)
#objc func tapAction(_ sender: UITapGestureRecognizer?) {
print("touched")
// Get the specific point that was touched
let point: CGPoint? = sender?.location(in: view)
webView.evaluateJavaScript("document.getElementById(\"hdfUserId\").value") {(response, error) in
if (response != nil) {
let title = response as! String
print(title)
}
// error handling
}
}
This is how I'm trying to get the button id by javascript, but I'm getting fail in that

siri shortcut button (INUIAddVoiceShortcutButton) shows wrong title when have multiple shortcuts (NSUserActivity)

I've 2 siri shortcuts in my App.
I use NSUserActivity to donate these shortcuts. I've also created 2 NSUserActivityTypes in my info.plist.
There are 2 view controllers which handle these shortcuts (1 view controller for 1 shortcut).
If I add 1 siri shortcut from 1 view controller and then go to 2nd view controller the native siri shortcut button (INUIAddVoiceShortcutButton) on 2nd view controller automatically picks the first shortcut (created from 1st view controller) and shows "Added to Siri" with suggested phrase instead of showing "Add to Siri" button. I double checked that each NSUserActivity has different identifier but still somehow its picks the wrong shortcut.
View Controller 1:
let userActivity = NSUserActivity(activityType: "com.activity.type1")
userActivity.isEligibleForSearch = true
userActivity.isEligibleForPrediction = true
userActivity.title = shortcut.title
userActivity.suggestedInvocationPhrase = suggestedPhrase
let attributes = CSSearchableItemAttributeSet(itemContentType: kUTTypeItem as String)
attributes.contentDescription = description
userActivity.contentAttributeSet = attributes
let shortcut = INShortcut(userActivity: userActivity)
let siriButton = INUIAddVoiceShortcutButton(style: .whiteOutline)
siriButton.translatesAutoresizingMaskIntoConstraints = false
siriButton.shortcut = shortcut
self.view.addSubview(siriButton)
View Controller 2:
let userActivity2 = NSUserActivity(activityType: "com.activity.type2")
userActivity2.isEligibleForSearch = true
userActivity2.isEligibleForPrediction = true
userActivity2.title = shortcut.title
userActivity2.suggestedInvocationPhrase = suggestedPhrase
let attributes = CSSearchableItemAttributeSet(itemContentType: kUTTypeItem as String)
attributes.contentDescription = description
userActivity2.contentAttributeSet = attributes
let shortcut = INShortcut(userActivity: userActivity2)
let siriButton = INUIAddVoiceShortcutButton(style: .whiteOutline)
siriButton.translatesAutoresizingMaskIntoConstraints = false
siriButton.shortcut = shortcut
self.view.addSubview(siriButton)
A similar thing happens when I delete the App and reinstall without deleting the shortcuts from Phone's Settings App.
Seems like its an IOS bug. I figured out a workaround for this problem. You have to create a new siri button every time the user add/edit the siri shortcut. Before creating siri button do the following things
1- Get all the voice shortcuts from INVoiceShortcutCenter by calling the function. Note that this happens asynchronously, so you need to do it some time before you need the data (e.g. in your AppDelegate). You'll also need to re-load this whenever the user adds a Siri Shortcut (probably in the INUIAddVoiceShortcutViewControllerDelegate.addVoiceShortcutViewController(_:didFinishWith:error) method).
INVoiceShortcutCenter.shared.getAllVoiceShortcuts { (voiceShortcutsFromCenter, error) in
guard let voiceShortcutsFromCenter = voiceShortcutsFromCenter else {
if let error = error as NSError? {
os_log("Failed to fetch voice shortcuts with error: %#", log: OSLog.default, type: .error, error)
}
return
}
self.voiceShortcuts = voiceShortcutsFromCenter
}
2- In View Controller-1 check if the shortcut is already added or not by iterating all the voice shortcuts
let voiceShorcut = voiceShortcuts.first { (voiceShortcut) -> Bool in
if let activity = voiceShortcut.shortcut.userActivity, activity.activityType == "com.activity.type1" {
return true
}
return false
}
3- If your voice shortcut is registered then pass the INShortcut to siri button otherwise don't set it.
if voiceShorcut != nil {
let shortcut = INShortcut(userActivity: userActivity1)
siriButton.shortcut = shortcut
}
Do the same thing in Second View Controller.
It's iOS 12.0 bug.
You can fix it by update INUIAddVoiceShortcutButton.voiceShortcut with correct value.
Use KVO to observe "voiceShortcut" property and when it change assign correct value to it.
I've moved to intents setup now and I find that even having just one intent setup and working the INUIAddVoiceShortcutButton is not able to track my shortcut. Once phrase is recorded it shows the Added to Siri with phrase.
But every time the app relaunches the Add to Siri button shows up instead of the Added to Siri button with recorded phrase.
I have tried going by Bilal's suggestion and although I can see the INVoiceShortcutCenter showing me my shortcut as present it doesn't loaded it into the Siri button.
My code looks like this for the button itself.
private func addSiriButton() {
let addShortcutButton = INUIAddVoiceShortcutButton(style: .blackOutline)
addShortcutButton.delegate = self
addShortcutButton.shortcut = INShortcut(intent: engine.intent )
addShortcutButton.translatesAutoresizingMaskIntoConstraints = false
siriButtonSubView.addSubview(addShortcutButton)
siriButtonSubView.centerXAnchor.constraint(equalTo: addShortcutButton.centerXAnchor).isActive = true
siriButtonSubView.centerYAnchor.constraint(equalTo: addShortcutButton.centerYAnchor).isActive = true
}
I have all the protocols implement and I had a close look at the Soup app but just can't figure out what drives this inaccuracy.
Funny enough, even British Airways app developers have given up on that as their button has exactly the same fault behaviour.
Update: I've built another test project with minimal amount implementation for the Intent and the Add to Siri and Added to Siri works perfectly. I'm guessing at this point that there is something in my own apps codebase that is causing this unwanted behaviour.
update 2 Just wanted to let everyone know I have fixed the issue. Using intents works fine but there is definitely a little sensitivity in the Intents definition file itself. All I had to do is create a new intent which then was generated and that worked. Seems my initial intent was somehow corrupt but there were no errors. After creating another intent and re-assigning intent handling function to that it all worked as intended. (pun intended)
I encountered this error when I had an existing intent and working configuration, but added a new parameter. However, in my Intent configuration, I had not added the new parameter name to a supported combination under the Shortcuts app section.
For example, if I had two properties myId and myName, and specified them as such:
let intent = MyIntent()
intent.myId = 1234
intent.myName = "banana"
Then I would need a supported combination of myId, myName in my intents definition file. In my particular case, I had forgotten myName so the INUIAddVoiceShortcutButton was attempting to do a lookup using myId, myName but didn't know how.
I just fixed this issue myself by changing my implementation (originally based on the soupchef app) to this code sample provided by apple (https://developer.apple.com/documentation/sirikit/inuiaddvoiceshortcutbutton):
EDIT: I added code that shows how I create and pass in the shortcutObject (INShortcut) for both UserActivity and custom Intent shortcuts.
The Shortcut class is an enum that contains a computed property called intent that returns an instantiation of the custom intent.
private func addShortcutButton(shortcut: Shortcut, parentViewController: UIViewController, shortcutViewControllerDelegate: INUIAddVoiceShortcutViewControllerDelegate) {
guard let view = parentViewController.view else { return }
if let intent = shortcut.intent {
shortcutObject = INShortcut(intent: intent)
} else if let userActivity = view.userActivity {
shortcutObject = INShortcut(userActivity: userActivity)
}
self.shortcutViewControllerDelegate = shortcutViewControllerDelegate
addSiriButton(to: shortcutButtonContainer)
}
func addSiriButton(to view: UIView) {
let button = INUIAddVoiceShortcutButton(style: .whiteOutline)
button.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(button)
view.centerXAnchor.constraint(equalTo: button.centerXAnchor).isActive = true
view.centerYAnchor.constraint(equalTo: button.centerYAnchor).isActive = true
button.addTarget(self, action: #selector(addToSiri(_:)), for: .touchUpInside)
}
// Present the Add Shortcut view controller after the
// user taps the "Add to Siri" button.
#objc
func addToSiri(_ sender: Any) {
guard let shortcutObject = shortcutObject else { return }
let viewController = INUIAddVoiceShortcutViewController(shortcut: shortcutObject)
viewController.modalPresentationStyle = .formSheet
viewController.delegate = shortcutViewControllerDelegate
parentViewController?.present(viewController, animated: true, completion: nil)
}
So we can't use the default Siri button, you have to use custom UIButton.
The class VoiceShortcutsManager will check all the voice intents and then we can search that list check if exist one match if yes so we should suggest edition if not we should suggest adding.
public class VoiceShortcutsManager {
private var voiceShortcuts: [INVoiceShortcut] = []
public init() {
updateVoiceShortcuts(completion: nil)
}
public func voiceShortcut(for order: DeviceIntent, powerState: State) -> INVoiceShortcut? {
for element in voiceShortcuts {
guard let intent = element.shortcut.intent as? ToggleStateIntent else {
continue
}
let deviceIntent = DeviceIntent(identifier: intent.device?.identifier, display: intent.device?.displayString ?? "")
if(order == deviceIntent && powerState == intent.state) {
return element
}
}
return nil
}
public func updateVoiceShortcuts(completion: (() -> Void)?) {
INVoiceShortcutCenter.shared.getAllVoiceShortcuts { (voiceShortcutsFromCenter, error) in
guard let voiceShortcutsFromCenter = voiceShortcutsFromCenter else {
if let error = error {
print("Failed to fetch voice shortcuts with error: \(error.localizedDescription)")
}
return
}
self.voiceShortcuts = voiceShortcutsFromCenter
if let completion = completion {
completion()
}
}
}
}
And then implement in your ViewController
class SiriAddViewController: ViewController {
let voiceShortcutManager = VoiceShortcutsManager.init()
override func viewDidLoad() {
super.viewDidLoad()
contentView.btnTest.addTarget(self, action: #selector(self.testBtn), for: .touchUpInside)
}
...
#objc func testBtn() {
let deviceIntent = DeviceIntent(identifier: smartPlug.deviceID, display: smartPlug.alias)
//is action already has a shortcut, update shortcut else create shortcut
if let shortcut = voiceShortcutManager.voiceShortcut(for: deviceIntent, powerState: .off) {
let editVoiceShortcutViewController = INUIEditVoiceShortcutViewController(voiceShortcut: shortcut)
editVoiceShortcutViewController.delegate = self
present(editVoiceShortcutViewController, animated: true, completion: nil)
} else if let shortcut = INShortcut(intent: intentTurnOff) {
let addVoiceShortcutVC = INUIAddVoiceShortcutViewController(shortcut: shortcut)
addVoiceShortcutVC.delegate = self
present(addVoiceShortcutVC, animated: true, completion: nil)
}
}
}
#available(iOS 12.0, *)
extension SiriAddViewController: INUIAddVoiceShortcutButtonDelegate {
func present(_ addVoiceShortcutViewController: INUIAddVoiceShortcutViewController, for addVoiceShortcutButton: INUIAddVoiceShortcutButton) {
addVoiceShortcutViewController.delegate = self
addVoiceShortcutViewController.modalPresentationStyle = .formSheet
present(addVoiceShortcutViewController, animated: true, completion: nil)
}
func present(_ editVoiceShortcutViewController: INUIEditVoiceShortcutViewController, for addVoiceShortcutButton: INUIAddVoiceShortcutButton) {
editVoiceShortcutViewController.delegate = self
editVoiceShortcutViewController.modalPresentationStyle = .formSheet
present(editVoiceShortcutViewController, animated: true, completion: nil)
}
}
#available(iOS 12.0, *)
extension SiriAddViewController: INUIAddVoiceShortcutViewControllerDelegate {
func addVoiceShortcutViewController(_ controller: INUIAddVoiceShortcutViewController, didFinishWith voiceShortcut: INVoiceShortcut?, error: Error?) {
voiceShortcutManager.updateVoiceShortcuts(completion: nil)
controller.dismiss(animated: true, completion: nil)
}
func addVoiceShortcutViewControllerDidCancel(_ controller: INUIAddVoiceShortcutViewController) {
controller.dismiss(animated: true, completion: nil)
}
}
#available(iOS 12.0, *)
extension SiriAddViewController: INUIEditVoiceShortcutViewControllerDelegate {
func editVoiceShortcutViewController(_ controller: INUIEditVoiceShortcutViewController, didUpdate voiceShortcut: INVoiceShortcut?, error: Error?) {
voiceShortcutManager.updateVoiceShortcuts(completion: nil)
controller.dismiss(animated: true, completion: nil)
}
func editVoiceShortcutViewController(_ controller: INUIEditVoiceShortcutViewController, didDeleteVoiceShortcutWithIdentifier deletedVoiceShortcutIdentifier: UUID) {
voiceShortcutManager.updateVoiceShortcuts(completion: nil)
controller.dismiss(animated: true, completion: nil)
}
func editVoiceShortcutViewControllerDidCancel(_ controller: INUIEditVoiceShortcutViewController) {
voiceShortcutManager.updateVoiceShortcuts(completion: nil)
controller.dismiss(animated: true, completion: nil)
}
}
}
This code was inspired/copy from this webpage:
https://www.nodesagency.com/test-drive-a-siri-shortcuts-intro/
My experience with solving this was a little different. Some intents added via the Add to Siri button worked, which adjusted to "Added to Siri", while others didn't. I realised the actions that worked didn't require parameters.
After setting default values for intents that exposed parameters, which are passed into INShortcut (and then assigned to INUIAddVoiceShortcutButton), all buttons updated their state correctly!

How to set different parameters in WhatsApp sharing with UIActivityViewController in iOS Swift?

I am using UIActivityViewController for sharing contents from app.
I want to share different content with different sharing apps.
Like in Message output will be like this.image + text + URL
in Whatsapp i would like to share like below image text + URL
How can i do this? See below screen shots for this.
It took me a good time figuring this out, but that's how it worked for me:
Think of this problem in two steps: first, we need to tell to the UIActivityViewController which content we want to share. Second, we need to return the content based on each social media, either a link, an image or a text. Its up to the social media app to tell which content it can handle, and it will only show up if we share the right kind of content.
In the first step, we will try to fool the social media apps, saying that we want to share an UIImage and a NSObject. This will open most of the social media apps to share.
In the second step, we will identify which social media app the user has clicked, and return the appropriated content for it.
Implementation:
create two UIActivityItemSource, one which will return an UIImage and other which will return the NSObject.
class SocialActivityItem: NSObject, UIActivityItemSource {
var img: UIImage?
var url: URL?
convenience init(img: UIImage, url: URL) {
self.init()
self.img = img
self.url = url
}
// This will be called BEFORE showing the user the apps to share (first step)
func activityViewControllerPlaceholderItem(_ activityViewController: UIActivityViewController) -> Any {
return img!
}
// This will be called AFTER the user has selected an app to share (second step)
func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivityType?) -> Any? {
//Instagram
if activityType?.rawValue == "com.burbn.instagram.shareextension" {
return img!
} else {
return url
}
}
}
and
class TextActivityItem: NSObject, UIActivityItemSource {
var textToShare: String?
convenience init(textToShare: String) {
self.init()
self.textToShare = textToShare
}
// This will be called BEFORE showing the user the apps to share (first step)
func activityViewControllerPlaceholderItem(_ activityViewController: UIActivityViewController) -> Any {
return NSObject()
}
// This will be called AFTER the user has selected an app to share (second step)
func activityViewController(_ activityViewController: UIActivityViewController, itemForActivityType activityType: UIActivityType?) -> Any? {
var text = ""
if activityType?.rawValue == "net.whatsapp.WhatsApp.ShareExtension" {
text = "Sharing on Whatsapp"
}
if activityType == UIActivityType.postToFacebook {
text = "Sharing on Facebook"
}
return text
}
}
Then, you just need to set everything up:
let url = URL(string: "www.google.com")!
let socialProvider = SocialActivityItem(img: img, url: url)
let textProvider = TextActivityItem(textToShare: "Sharing on social media!")
let activityViewController = UIActivityViewController(activityItems: [socialProvider, textProvider], applicationActivities: nil)

Perform action in host app from Today extension(Widget) Without opening app ios

I want to manage some action in containing app from today extension(Widget).
Full description:
in my containing app, some action (like play/pause audio) perform. And want to manage that action also from today extension(widget). An action continues to perform in background state as well.
In today extension, the same action will perform. so for that, if in the main containing app already starts an action and send it into background state, a user can pause action from a widget. and the user also can start/pause action any time from the widget (today extension).
For achieve this goal I used UserDefault with app Group capability and store one boolean value. when widget present it checks boolean value and set button state play/pause. it's set correctly but when I press extension button action does not perform in host app.
code:
in main containing app code
override func viewDidLoad() {
super.viewDidLoad()
let objUserDefault = UserDefaults(suiteName:"group.test.TodayExtensionSharingDefaults")
let objTemp = objUserDefault?.object(forKey: "value")
self.btnValue.isSelected = objTemp
NotificationCenter.default.addObserver(self, selector: #selector(self.userDefaultsDidChange), name: UserDefaults.didChangeNotification, object: nil)
}
func userDefaultsDidChange(_ notification: Notification) {
let objUserDefault = UserDefaults(suiteName: "group.test.TodayExtensionSharingDefaults")
objUserDefault?.synchronize()
let objTemp = objUserDefault?.object(forKey: "value")
self.btnValue.isSelected = objTemp
}
In Extension Class:
#IBAction func onPlayPause(_ sender: UIButton) {
DispatchQueue.main.async {
let sharedDefaults = UserDefaults(suiteName: "group.test.TodayExtensionSharingDefaults")
if let isPlaying = sharedDefaults?.bool(forKey: "isPlaing") {
sharedDefaults?.set(!isPlaying, forKey: "isPlaying")
}else{
sharedDefaults?.set(false, forKey: "isPlaying")
}
sharedDefaults?.synchronize()
}
notification was not fired when a user updates default. it's updated value when the app restarts.
so how to solve this issue?
and the same thing wants to do in opposite means from containing app to a widget.
(easy to user single action object but how?)
And is any other way to perform a quick action in containing app from extension without opening App?
Use MMWormhole (or its new and unofficial Swift version, just Wormhole). It's very simple.
In the app's view controller:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let wormhole = MMWormhole(applicationGroupIdentifier: "group.test.TodayExtensionSharingDefaults",
optionalDirectory: "TodayExtensionSharingDefaults")
wormhole.listenForMessage(withIdentifier: "togglePlayPause") { [weak self] _ in
guard let controller = self else { return }
controller.btnValue.isSelected = controller.btnValue.isSelected
}
}
In the extension:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view from its nib.
self.wormhole = MMWormhole(applicationGroupIdentifier: "group.test.TodayExtensionSharingDefaults", optionalDirectory: "TodayExtensionSharingDefaults")
}
#IBAction func onPlayPause(_ sender: UIButton) {
guard let wormhole = self.wormhole else { extensionContext?.openURL(NSURL(string: "foo://startPlaying")!, completionHandler: nil) } // Throw error here instead of return, since somehow this function was called before viewDidLoad (or something else went horribly wrong)
wormhole.passMessageObject(nil, identifier: "togglePlayPause")
}
Declare foo:// (or whatever else you use) in Xcode's Document Types section, under URLs, then implement application(_:open:options:) in your AppDelegate so that the app starts playing music when the URL passed is foo://startPlaying.
Create Custom URL Sceheme
Check groups data.(are you setting correct or not)
Whenever you click on button, the host app will get called from Appdelegate, UIApplication delegate
func application(_ application: UIApplication, open urls: URL, sourceApplication: String?, annotation: Any) -> Bool {
let obj = urls.absoluteString.components(separatedBy: "://")[1]
NotificationCenter.default.post(name: widgetNotificationName, object: obj)
print("App delegate")
return true
}
Fire your notification from there then observe it anywhere in your hostapp.
Widget Button action code
#IBAction func doActionMethod(_ sender: AnyObject) {
let button = (sender as! UIButton)
var dailyThanthi = ""
switch button.tag {
case 0:
dailyThanthi = "DailyThanthi://h"
case 1:
dailyThanthi = "DailyThanthi://c"
case 2:
dailyThanthi = "DailyThanthi://j"
// case 3:
// dailyThanthi = "DailyThanthi://s"
// case 4:
// dailyThanthi = "DailyThanthi://s"
default:
break
}
let pjURL = NSURL(string: dailyThanthi)!
self.extensionContext!.open(pjURL as URL, completionHandler: nil)
}
Check out custom url type:
https://developer.apple.com/library/content/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/Inter-AppCommunication/Inter-AppCommunication.html
Note:
There is no direct communication between an app extension and its
containing app; typically, the containing app isn’t even running while
a contained extension is running. An app extension’s containing app
and the host app don’t communicate at all.
In a typical request/response transaction, the system opens an app extension on behalf of a host app, conveying data in an extension
context provided by the host. The extension displays a user interface,
performs some work, and, if appropriate for the extension’s purpose,
returns data to the host.
The dotted line in Figure 2-2 represents the limited interaction available between an app extension and its containing app. A Today
widget (and no other app extension type) can ask the system to open
its containing app by calling the openURL:completionHandler: method of
the NSExtensionContext class. As indicated by the Read/Write arrows in
Figure 2-3, any app extension and its containing app can access shared
data in a privately defined shared container. The full vocabulary of
communication between an extension, its host app, and its containing
app is shown in simple form in Figure 2-3.
https://developer.apple.com/library/content/documentation/General/Conceptual/ExtensibilityPG/ExtensionOverview.html

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