EnvironmentObject Example

EnvironmentObjectExample.swift

import SwiftUI

struct EnvironmentParentView: View {
    @StateObject private var myObject = MyObject()
    var body: some View {
        VStack(spacing: 16) {
            Text("The parent passed down myObject as an environment, so any view in it's hierarchy can reference it, but only if they need to")
                .font(.title)
            Text(myObject.someFlag ? "✅" : "❌")
            EnvironmentChild()
        }
        // This is how any subviews that care about myObject can get a reference
        .environmentObject(myObject)
    }
}

struct EnvironmentChild: View {
    var body: some View {
        VStack {
            Text("No need for myObject reference, even though the grandchild does")
            EnvironmentGrandchild()
        }
    }
}

struct EnvironmentGrandchild: View {
    // By referencing this enviroment object the grandchild just magically gets access to it
    @EnvironmentObject private var myObject: MyObject
    var body: some View {
        VStack {
            Button("Toggle") {
                myObject.someFlag.toggle()
            }
            .buttonStyle(.borderedProminent)
        }
        .padding()
    }
}