WWDC22 SALE: Save 50% on all my Swift books and bundles! >>

Day 47 Tracker App: Updating activity count pops the current/updating view

Forums > 100 Days of SwiftUI

Following the Day 47 Tracker app challenge, I have an activity view with a button that increments the activity count:

Button {
    if let index = activities.items.firstIndex(of: activity) {
        let newActivity = Activity(name: activity.name, description: activity.description, count: activity.count + 1)
        activities.items[index] = newActivity
    }
}

The assignment to the activities array causes the activity details view to pop, returning to the parent, ContentView. I suspect since Activity.index is @Published it is forcing the redraw of the owning view, thus popping the current view. This is not desired behavior. I have tried adding .navigationViewStyle(.stack) to the parent NavigationView, as suggested by others on the web but it did not help.

Does anyone know how to update the @Published field without causing the current View to pop? Thanks!

1      

Hacking with Swift is sponsored by Emerge

SPONSORED Why are Swift reference types bad for app startup time, and what’s the performance cost of protocol conformances? That’s just a couple of the topics you can learn about on the Emerge blog — written by the app performance experts behind Emerge’s advanced app optimization and monitoring tools, based on their experience of working at companies like Apple, Airbnb, Snap, and Spotify.

Find out more

Sponsor Hacking with Swift and reach the world's largest Swift community!

Reply to this topic…

You need to create an account or log in to reply.

All interactions here are governed by our code of conduct.

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.