DataFlow from Swift to SwfitUI

Question

Created Jul ’21

Replies 3

Boosts 0

Participants 2

I have the business logic in Swift class and built UI using SwiftUI. Below the high level code that shows how SwiftUI and its subview receives the data from Swift. Please let me know if its correct approach

 class SwiftClass{
 
    var score = "1"
 
    func A () {}
 
    
 
    func B () {
 
        // score will get updated frequently
 
        let scoreModal =  ScoreUIViewModel()
 
        let scoreUI: ScoreUI = ScoreUI(showModal: .constant(true), scoreUIViewModel: scoreModal)
 
        DispatchQueue.main.async {
 
            scoreUI.displayScoreUI()
 
        }
 
       // score getting updated from another class
 
        scoreModal.score = score
 
// score getting updated from another class
        score  = "2"
 
        scoreModal.score = "2"
 
// score getting updated from another class
        score  = "3"
 
        scoreModal.score = "3"
 
// score getting updated from another class      
  score  = "4"
 
        scoreModal.score = "4"
 
     .......
        
 
    }
 
}
 
 
 
 
 
 
 
import SwiftUI
 
 
 
class ScoreUIViewModel: Observable {
 
    @Published score: String
 
}
 
struct ScoreUI: View {
 
    @State var scoreUIViewModel: ScoreUIViewModel
 
    func displayScoreUI() {
 
        let hostController = UIHostingController(rootView: ScoreUI())
 
        hostController = .overCurrentContext
 
        topViewController()!.present(hostController, animated: true, completion: nil)
 
    }.environmentObject(scoreUIViewModel)
 
    
 
}
 
 
 
struct ScoreText: View {
 
    @EnvironmentObject var scoreUIViewModel: ScoreUIViewModel
 
    Text(score).foregroundColor(.green)
}

Boost

Answer 1

Claude31 OP

Jul ’21

Does it work as you want ?

0

Answer 2

Claude31 OP

Jul ’21

I don’t understand what you want to achieve with the consecutive assignments:

 score = "2"
score = "3"
score = "4"

At the end it will always be 4.

Or do you mean it is a test

if score = "2" { }

in that case, please show the real code.

0

Answer 3

iphonegamedeveloper OP

Jul ’21

Yes.

0

	class SwiftClass{

	var score = "1"

	func A () {}



	func B () {

	// score will get updated frequently

	let scoreModal = ScoreUIViewModel()

	let scoreUI: ScoreUI = ScoreUI(showModal: .constant(true), scoreUIViewModel: scoreModal)

	DispatchQueue.main.async {

	scoreUI.displayScoreUI()

	}

	// score getting updated from another class

	scoreModal.score = score

	// score getting updated from another class
	score = "2"

	scoreModal.score = "2"

	// score getting updated from another class
	score = "3"

	scoreModal.score = "3"

	// score getting updated from another class
	score = "4"

	scoreModal.score = "4"

	.......


	}

	}







	import SwiftUI



	class ScoreUIViewModel: Observable {

	@Published score: String

	}

	struct ScoreUI: View {

	@State var scoreUIViewModel: ScoreUIViewModel

	func displayScoreUI() {

	let hostController = UIHostingController(rootView: ScoreUI())

	hostController = .overCurrentContext

	topViewController()!.present(hostController, animated: true, completion: nil)

	}.environmentObject(scoreUIViewModel)



	}



	struct ScoreText: View {

	@EnvironmentObject var scoreUIViewModel: ScoreUIViewModel

	Text(score).foregroundColor(.green)
	}