URLImage+ImageLoader.swift

struct URLImage : View {
    
    // ...
  
    @ObjectBinding private var imageLoader: ImageLoader

    var body: some View {
        if let image = imageLoader.image {
            return image
        }
        else {
            return placeholder
        }
    }
}

class ImageLoader : BindableObject {
    
    var image: Image?

    func load() {
        // ...
    }
  
    func cancel() {
        // ...
    }
}