EditMode Sample

ContentView.swift

import SwiftUI

struct ContentView: View {
    @State var mode = EditMode.inactive

    var body: some View {
        NavigationStack {
            VStack {
                ForEach(1..<12) { offset in
                    FooView(count: 12, offset: offset)
                }
            }
            .padding()
            .toolbar {
                EditButton()
            }
            .environment(\.editMode, $mode)
        }
    }
}

struct FooView: View {
    private static let colors: [Color] = [.red, .green, .blue, .yellow]
    let count: Int
    let offset: Int

    var body: some View {
        ZStack {
            HStack {
                ForEach(Array(0..<count), id: \.self) { i in
                    BarView(color: Self.colors[(i + offset) % Self.colors.count])
                }
            }
        }
    }
}

struct BarView: View {
    @Environment(\.editMode) private var mode
    let color: Color

    var body: some View {
        let mode = mode?.wrappedValue
        Circle()
            .foregroundStyle(mode == .active ? color : .gray)
    }
}

#Preview {
    ContentView()
}