LoadView: SwiftUI view that calls a load function and shows a `LoadingView: UIView` until the `isLoading` binding is changed to false, then displays its contents.

LoadView.swift

import SwiftUI

typealias IsLoadingBool = Bool // To help remember which way the bool goes (false means ready to display)

protocol LoadedView {
    func load() -> Binding<IsLoadingBool>
}

// LoadingView is an existing full-screen UIView in my codebase.
// This could be replaced by any custom View
struct LoadingViewWrapper: UIViewRepresentable {
    func makeUIView(context: Context) -> LoadingView {
        let loadingView = LoadingView()
        loadingView.startAnimating()
        return loadingView
    }

    func updateUIView(_ loadingView: LoadingView, context: Context) {
    }
}

struct Load<Content: View>: View {
    @Binding var isLoading: Bool
    let content: Content

    init(_ loadedView: LoadedView, @ViewBuilder contentBuilder: () -> Content) {
        _isLoading = loadedView.load()
        content = contentBuilder()
    }

    init(loadFunction: () -> Binding<IsLoadingBool>, @ViewBuilder contentBuilder: () -> Content) {
        _isLoading = loadFunction()
        content = contentBuilder()
    }

    var body: some View {
        if isLoading {
            LoadingViewWrapper(isAnimating: $isLoading)
        } else {
            content
        }
    }
}