SwiftUI Drag and Drop example for grid items

ContentView.swift

import SwiftUI

extension RandomAccessCollection {
    func indexed() -> Array<(offset: Int, element: Element)> {
        return Array(enumerated())
    }
}

struct ContentView: View {
    @State private var items: [[String]] = [
        ["1"], ["2"], ["3"], ["4"], ["5"], ["6"], ["7"]
    ]

    var body: some View {
        ScrollView {
            LazyVGrid(columns: Array(repeating: .init(), count: 7)) {
                ForEach(items.indexed(), id: \.1.self) { index, array in
                    VStack {
                        ForEach(array, id: \.self) { item in
                            Text(item)
                                .frame(
                                    minWidth: 100, maxWidth: .infinity,
                                    minHeight: 100, maxHeight: .infinity
                                )
                                .background(Color.red)
                                .onDrag {
                                    NSItemProvider(object: item as NSString)
                                }
                                .onDrop(of: ["public.utf8-plain-text"], isTargeted: nil) { provider in
                                    guard let item = provider.first, item.canLoadObject(ofClass: NSString.self) else {
                                        return false
                                    }

                                    _ = item.loadObject(ofClass: NSString.self) { reading, error in
                                        if let string = reading as? String {
                                            for oldIndex in items.indices {
                                                if let itemIndex = items[oldIndex].firstIndex(of: string) {
                                                    items[oldIndex].remove(at: itemIndex)
                                                }
                                            }
                                            items[index].append(string)
                                        }
                                    }
                                    return true
                                }
                        }
                    }
                }
            }
        }
    }
}