Drag'n'Drop with SwiftUI

SwiftUIDragDrop.swift

import SwiftUI
import PlaygroundSupport


struct MyView: View {
    
    @State var viewOffset: CGSize = .zero {
        didSet {
            let newFrame = viewFrame.offsetBy(dx: self.viewOffset.width, dy: self.viewOffset.height)
            self.canDrop = containerFrame.intersects(newFrame)
        }
    }
    @State var containerFrame: CGRect  = .zero
    @State var viewFrame: CGRect = .zero {
        didSet {
            print("View frame: \(self.viewFrame)")
        }
    }
    
    @State var canDrop: Bool = false
    
    var body: some View {
        VStack {
            VStack {
                Text( canDrop ? "Drop view here": "You cant drop here")
            }
            .background(canDrop ? Color.yellow : Color.blue)
                .overlay(GeometryReader { r in
                    Color.clear
                        .onAppear {
                            self.containerFrame = r.frame(in: .global)
                            print("\(self.containerFrame)")
                    }
                })
            HStack {
                Text("Drag me")
            }
                .overlay(GeometryReader { r in
                    Color.clear
                        .onAppear {
                            self.viewFrame = r.frame(in: .global)
                    }
                })
                .background(Color.white)
                .offset(viewOffset)
            .gesture(DragGesture(coordinateSpace: .global).onChanged({ (value) in
                self.viewOffset = value.translation
            }).onEnded({ (value) in
                self.viewOffset = .zero
            }))
        }
    }
    
}


let controller = UIHostingController(rootView: MyView())
PlaygroundPage.current.liveView = controller