SwiftUI .onRender view modifier

OnRenderViewModifier

/*
USAGE

struct ContentView: View {
    var body: some View {
        Text("Hello, World!")
            .onRender {
                print("View rendered or updated")
            }
    }
}

*/

import SwiftUI
import Combine

class RenderNotifier: ObservableObject {
    let objectWillChange = PassthroughSubject<Void, Never>()
    
    func viewRendered() {
        objectWillChange.send()
    }
}

struct ViewRenderedNotifier: ViewModifier {
    @StateObject private var renderNotifier = RenderNotifier()

    let onRender: () -> Void

    func body(content: Content) -> some View {
        content
            .onReceive(renderNotifier.objectWillChange) {
                onRender()
            }
            .onAppear {
                renderNotifier.viewRendered()
            }
    }
}

extension View {
    func onRender(_ onRender: @escaping () -> Void) -> some View {
        self.modifier(ViewRenderedNotifier(onRender: onRender))
    }
}