Adopt Quick Note

16:57 - How to adopt NSUserActivity to support Quick Note

// Create the NSUserActivity and describe the content or user activity
let activity = NSUserActivity(activityType: "com.myapp.MyActivityType")
activity.title = document.title

// Set one or more of:
//   .targetContentIdentifier
//   .persistentIdentifier
//   .webpageURL
activity.targetContentIdentifier = "uniqueGlobalStableIdentifier"

// Set userInfo to save app-specific state information 
activity.userInfo = ["myKey": …]

// Attach it to a view controller, window, or other responder; let the system make it current when needed
viewController.userActivity = activity

17:02 - Handle NSUserActivity continuation in your window scene delegate or app delegate - iOS

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    func scene(_ scene: UIScene, willContinueUserActivityWithType userActivityType: String) {
        // show user feedback while waiting for the NSUserActivity to arrive
    }
    
    func scene(_ scene: UIScene, continue userActivity: NSUserActivity) {
        // set up view controllers and views to continue the activity
    }
    
    func scene(_ scene: UIScene, didFailToContinueUserActivityWithType userActivityType: String, error: Error) {
        // show error about failing to continue an activity
    }

    …
}

17:06 - Handle NSUserActivity continuation in your window scene delegate or app delegate - macOS

class AppDelegate: NSObject, NSApplicationDelegate {

    func application(_ application: NSApplication, willContinueUserActivityWithType userActivityType: String) -> Bool {
        // show user feedback while waiting for the NSUserActivity to arrive
        return true
    }
    
    func application(_ application: NSApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([NSUserActivityRestoring]) -> Void) -> Bool {
        // set up view controllers or documents to continue the activity
        return true
    }
    
    func application(_ application: NSApplication, didFailToContinueUserActivityWithType userActivityType: String, error: Error) {
        // show error about failing to continue an activity, if appropriate
    }
    
    …
}

17:26 - Improve performance with needsSave

activity.needsSave = true

…

func userActivityWillSave(_ userActivity: NSUserActivity) {
    userActivity.userInfo = [
        "center" : visibleFrame.middle
        "zoomScale" : scrollView.zoomScale
    ]
}