Gist for the video: https://youtu.be/--trFVUwlns?si=dcH1pvKd7Q3kSSHi

ImageRendererWithShareLink.swift

import SwiftUI

struct ContentView: View {

    @State private var shareableImage: UIImage?
    @State private var didCallOnAppearForTheFirstTime = false

    var body: some View {
        VStack(spacing: 24.0) {
            makeBody()
            if let shareableImage {
                let imageAsSwiftUIImage = Image(uiImage: shareableImage)
                ShareLink(
                    item: imageAsSwiftUIImage,
                    preview: SharePreview("Achievement!", image: imageAsSwiftUIImage)
                ) {
                    Text("Share")
                }
            }
        }
        .onAppear {
            guard didCallOnAppearForTheFirstTime == false else {
                return
            }
            didCallOnAppearForTheFirstTime = true
            renderImage()
        }
        .padding()
    }

    func makeBody() -> some View {
        VStack {
            Image(systemName: "trophy.fill")
                .resizable()
                .frame(width: 256.0, height: 256.0)
                .foregroundStyle(Color.yellow)
            Text("10th workout completed!")
                .font(.largeTitle)
                .fontWeight(.semibold)
                .foregroundStyle(Color.black)
                .frame(maxWidth: .infinity)
        }
        .background(Color.white)
    }

    func renderImage() {
        let body = makeShareableView()
        let renderer = ImageRenderer(content: body)
        guard let image = renderer.uiImage else {
            // show alert
            return
        }
        shareableImage = image
        // share with user
    }

    private func makeShareableView() -> some View {
        VStack {
            makeBody()
                .padding()
        }
        .background(Color.white)
    }
}

#Preview {
    ContentView()
}