It was necessary to have strong references to WebViewConfiguration, UIDelegate and NavigationDelegate in WebView.

[Kyome22]

We changed the strong reference to a weak reference in PR #40, but this was a mistake.
The following implementations will no longer function.

WebView(configuration: MyWebViewConfiguration())
    .uiDelegate(MyUIDelegate())
    .navigationDelegate(MyNavigationDelegate())

The strong references to MyWebViewConfiguration, MyUIDelegate, and MyNavigationDelegate are nowhere to be found, so the instances are destroyed before they are applied to the WKWebView.

It will work if the parent View of the WebView has these references, but it is not necessarily used that way.

[Kyome22]

Even if ChildView has a reference to ParentView, that alone will not cause a memory leak, so perhaps it is not a problem if it has a reference to an instance in struct View.

import SwiftUI

@main
struct TestAppApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

struct ContentView: View {
    @State var isOn = false
    
    var body: some View {
        VStack {
            Toggle(isOn: $isOn) {
                Text("Open")
            }
        }
        .sheet(isPresented: $isOn) {
            ParentView()
        }
    }
}

struct ParentView: View {
    var body: some View {
        VStack {
            Text("ParentView")
            ChildView(parent: self)
        }
    }
}

struct ChildView: View {
    var parent: ParentView
    
    var body: some View {
        Text("ChildView")
    }
}