BLACK FRIDAY: Save 50% on all our Swift books and bundles! >>

How to continue an NSUserActivity in SwiftUI

Paul Hudson    @twostraws   

Updated for Xcode 13.2

New in iOS 14

SwiftUI has a dedicated onContinueUserActivity() modifier that can catch a variety of NSUserActivity types – clicks from the web, launches from Spotlight or Siri, and more. Previously you might have handled this in your AppDelegate using something like application(_:continue:restorationHandler:), but SwiftUI’s approach is more fine-grained and lets us divide functionality more easily.

To implement this, first create a function that will accept an NSUserActivity. You don’t need to do this inside your App struct, but it would make sense to do so because you can then route it wherever you need in the rest of your program.

For example, this function checks to see whether we’re being passed in data from Spotlight, and if so pulls out the unique identifier so you can look it up in your data source:

func handleSpotlight(_ userActivity: NSUserActivity) {
    if let id = userActivity.userInfo?[CSSearchableItemActivityIdentifier] as? String {
        print("Found identifier \(id)")
    }
}

Note: That doesn’t need to check the activityType property, because it will be filtered by SwiftUI in our next code.

Now you can attach that to your main app’s view by modifying your App struct like this:

WindowGroup {
    ContentView()
        .onContinueUserActivity(CSSearchableItemActionType, perform: handleSpotlight)
}

Of course, that’s just the bare bones of handling a user activity – you’ve detected the activity and your code has been run, but now you need to do the actual work of responding to the event somehow.

If you’re not sure where to start, you should probably make your handleSpotlight() set some shared state in your program that drives your UI, for example causing a detail view to present.

Save 50% in my Black Friday sale.

SAVE 50% This Black Friday all our books and bundles are half price, so you can take your Swift knowledge further without spending big! Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testing skills, and more.

Save 50% on all our books and bundles!

Similar solutions…

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 3.7/5

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.