JustZht's EchoChamber

import SwiftUI

extension View {
    func imageRepresentation(rect: CGRect) -> NSBitmapImageRep? {
        let hosting = NSHostingView(rootView: self.frame(width: rect.width, height: rect.height))
        hosting.setFrameSize(rect.size)
        hosting.setBoundsSize(rect.size)
        hosting.layout()
        hosting.layerContentsRedrawPolicy = .onSetNeedsDisplay
        hosting.setNeedsDisplay(rect)
        if let imageRepresentation = hosting.bitmapImageRepForCachingDisplay(in: rect) {
            hosting.cacheDisplay(in: rect, to: imageRepresentation)
            return imageRepresentation
        }
        return nil
    }
    
    func asImage(rect: CGRect) -> NSImage? {
        if let cgImage = imageRepresentation(rect: rect)?.cgImage {
            return NSImage(cgImage: cgImage, size: rect.size)
        }
        return nil
    }
    
    func asJpegData(rect: CGRect) -> Data? {
        return imageRepresentation(rect: rect)?.representation(using: .jpeg, properties: [:])
    }
}

Usage:

let view = AnyView(<Your View Here>)
let imageData = view.asJpegData(rect: CGRect.init(x: 0, y: 0, width: 128, height: 128))