can i define something like func myRender() -> Image | Text (union-types) ?

大家好.我想我错过了SwiftUI演示中一个无法解决的问题:一个简单的url图像渲染器，带有一个子渲染块，代码如下:

import Foundation
import SwiftUI

struct URLImage: View {
    var urlString: String;
    @State var loaded = false
    @State var error: Any?
    @State var data: Data?

    func didMount() {
        print("!!! viewWillAppear", self.urlString)
        // just load url and get data in the callback fn:
        // (String, (Any?, Data) -> Void) -> Void
        // $0 is error, $1 is data
        loadImage(urlString: self.urlString) {
            print("loaded", $0 ?? "no error", $1)
            self.error = $0
            self.data = $1
            self.loaded = true
        }
    }
    
    // what is the return-type of tryRender ?
    func tryRender() -> View { // doesn't works now because `View` is a protocol
        // self.data maybe nil or with a wrong binary format
        guard let image = try? Image(nsImage: NSImage(data: self.data!)!) else {
//            return Image("image_format_error") // it works with "func tryRender() -> Image" but ... emmm
            return Text("image_format_error") // this is what i want, but this can't works
        }

        return image
    }

    var body: some View {
        self.didMount()
        return VStack {
            if (self.error != nil) {
                Text("URLImage Error")
            } else {
                if (self.loaded) {
                    self.tryRender()
                } else {
                    Text("not loaded")
                }
            }
        }
    }
}

struct URLImage_Previews: PreviewProvider {
    static var previews: some View {
        URLImage(
            urlString: "http://127.0.0.1:3000/0009.jpg"
        )
    }
}

问题是tryRender()的返回类型，我无法编写tryRender() -> Image | Text个像typescript的联合类型来表达我的观点.

图像或文本是否具有使其工作的基本类型？或者有另一种方法来编写这样的子渲染片段func？