[SwiftUI] Manipulating SwiftUI View Body during runtime

Question

sidharth_m OP

Created Feb ’23

Replies 2

Boosts 1

Participants 2

Hello,

I have a standalone WatchOS project using SwiftUI for the interface. During the App's init (), I trigger a Swift function call, that does some background activity in a worker thread. By default, the SwiftUI View shows a single label with "Hello World". The result of the worker thread will require an arbitary View to be shown, for eg., I want to show a View with four Labels now. In my use case, the layout for the View, can only be calculated at runtime.

Is there a way to arbitrarily manipulate a SwiftUI based View from Swift code at runtime?

Thanks!

Boost

Answer 1

Claude31 OP

Feb ’23

It would help if you showed your code and where the error appears.

0

Answer 2

sidharth_m OP

Feb ’23

There is no error per se. My doubt is about how to dynamically use swiftui on the fly. To give an idea on the flow:

// MyApp.swift

import SwiftUI

@main
struct MyApp: App {
     
     let obj = MyWorkerClass ()

 init ()
     {
         obj.callEntryPoint ()
     }

 var body: some Scene {

         WindowGroup {
             ContentView ()
         }
    }
}

// ContentView.swift

import SwiftUI

struct ContentView: View {

 var body: some View {

        VStack {

            Image(systemName: "globe")

                .imageScale(.large)

                .foregroundColor(.accentColor)

            Text("Hello, world!")

        }

        .padding()

    }

}

// MyWorkerClass.swift

class MyWorkerClass
{

 func callEntyPoint ()
 {
     // Switch to a worker thread and do some operations

      DispatchQueue.global(qos: .background).async {
      
      // Once the operations are done, Show some UI change on the Main thread

      DispatchQueue.main.async {

            // Create a new Label on the screen 
       }

      }

 }

}

0