How to drag and drop text from one view to another view within an app.

SwiftUIDragNDropText.swift

//  Xcode 12.3

import SwiftUI

class ViewModel: ObservableObject {
    @Published var itemsInUpperStack: [String] = ["Drag me down", "Some more text"]
    @Published var itemsInLowerStack: [String] = ["Drag me up", "one two three"]
    func move(item: String) {
        if !itemsInLowerStack.contains(item) {
            itemsInLowerStack.append(item)
        }
        if !itemsInUpperStack.contains(item) {
            itemsInUpperStack.append(item)
        }
    }
}

struct ContentView: View {
    @ObservedObject var viewModel = ViewModel()
    var body: some View {
        TextContainer(viewModel: viewModel, items: viewModel.itemsInUpperStack)
        TextContainer(viewModel: viewModel, items: viewModel.itemsInLowerStack)
    }
}

struct TextContainer: View {
    let viewModel: ViewModel
    let items: [String]
    var body: some View {
        HStack(spacing: 10) {
            ForEach(items, id: \.self){
                item in
                Text(item)
                    .font(.title)
                    .frame(maxWidth: .infinity, maxHeight: .infinity)
                    .background(Color.randomColor(withAlpha: 0.3))
                    .onDrag({
                        NSItemProvider(object: item as NSString)
                    })
            }
        }
        .onDrop(of: ["public.text"], isTargeted: nil, perform: { (providers) -> Bool in
            if let firstProvider = providers.first {
                _ = firstProvider.loadObject(ofClass: String.self) { (providerReading, error) in
                    if providerReading != nil {
                        print("provider reading is ", providerReading!)
                        DispatchQueue.main.async {
                            self.viewModel.move(item: providerReading!)
                        }
                    }
                }
                return true
            }
            return false
        })
        .padding()
        .addDashedBorder()
        .padding()
    }
}

extension View {
    func addDashedBorder() -> some View {
        self
            .overlay(RoundedRectangle(cornerRadius: 10).stroke(style: StrokeStyle(lineWidth: 10, dash: [20])))
    }
}

extension Color {
    static func randomColor(withAlpha alpha: CGFloat) -> Color {
        let randomUIColor = UIColor(red: CGFloat.random(in: 0...1), green: CGFloat.random(in: 0...1), blue: CGFloat.random(in: 0...1), alpha: alpha)
        return Color(randomUIColor)
    }
}