How do I render a SwiftUI View that is not at the root hierarchy as a UIImage?

Question

Suppose I have a simple SwiftUI View that is not the ContentView such as this:

struct Test: View {        
    var body: some View {
        VStack {
                


        

Answer 1

Solution of Asperi works, but if you need image without white background you have to add this line:

controller.view.backgroundColor = .clear

And your View extension will be:

extension View {
    func asImage() -> UIImage {
        let controller = UIHostingController(rootView: self)
        
        // locate far out of screen
        controller.view.frame = CGRect(x: 0, y: CGFloat(Int.max), width: 1, height: 1)
        UIApplication.shared.windows.first!.rootViewController?.view.addSubview(controller.view)
        
        let size = controller.sizeThatFits(in: UIScreen.main.bounds.size)
        controller.view.bounds = CGRect(origin: .zero, size: size)
        controller.view.sizeToFit()
        controller.view.backgroundColor = .clear
        let image = controller.view.asImage()
        controller.view.removeFromSuperview()
        return image
    }
}