[Dragging View] from https://forums.developer.apple.com/thread/127002

DraggingView.swift

import SwiftUI

struct DayView: View {
    
    @GestureState var dragState = DragState.inactive
    @State var viewDragState = CGSize(width: 0, height: 120)
    
    var translationOffset: CGSize {
        return CGSize(width: 0, height: viewDragState.height + dragState.translation.height)
    }
    
    enum DragState {
        case inactive
        case dragging(translation: CGSize)
        
        var translation: CGSize {
            switch self {
                case .dragging(let translation):
                    return translation
                default:
                    return .zero
            }
        }
    }
    
    var body: some View {
        
        let dragGesture = DragGesture()
            .updating($dragState) { value, state, transaction in
                state = .dragging(translation: value.translation)
        }
        .onEnded { value in
            self.viewDragState.height += value.translation.height
            self.viewDragState.width += value.translation.width
        }
        
        return GeometryReader { geometry in
            ZStack(alignment: .top) {
                VStack(spacing: 0) {
                    ForEach(0..<2) {_ in
                        Text("X").frame( height: 60)
                        Divider()
                    }
                }
                Text("Meet with Test 2-4").frame(width: geometry.size.width, height: 60, alignment: .topLeading).background(Color.red)
                    .offset(self.translationOffset)
                    .gesture(dragGesture)
            }
        }
    }
}

struct ContentView: View {
    var body: some View {
        HStack {
            DayView().background(Color.blue)
            DayView().background(Color.yellow)
            DayView().background(Color.green)
        }.padding(10).border(Color.red, width: 3)
    }
}


struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}