How do I support handoff and continuity on macOS using Swift?

To support Handoff and Continuity on macOS using Swift, you'll need to configure your app to share a common entitlements and implement the necessary APIs to handle continuing activities. Handoff allows users to start an activity on one Apple device and pick it up on another. This feature requires both your macOS app and its iOS counterpart to support Handoff.

Step-by-Step Implementation

  • Ensure App IDs and Entitlements:
  • Enable Handoff in your app's capabilities in Xcode.
  • Create a unique NSUserActivity in your app.
  • Configure your app to handle Handoff actions.

Swift Code Example

        // Create a user activity for Handoff
        let activity = NSUserActivity(activityType: "com.example.yourapp.view")
        activity.title = "Continue viewing"
        activity.userInfo = ["itemID": 12345] // Example data
        activity.isEligibleForHandoff = true
        activity.becomeCurrent() // Activate the activity

Handling Incoming Activities

Implement the method in your AppDelegate to handle incoming activities:

        func application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([UIUserActivityRestoring]?) -> Void) -> Bool {
            if userActivity.activityType == "com.example.yourapp.view" {
                // Handle the activity and navigate the user accordingly
                if let itemID = userActivity.userInfo?["itemID"] as? Int {
                    // Load the relevant content in your app
                }
                return true
            }
            return false
        }

handoff continuity macOS Swift user activity entitlements user experience app development

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