loading and error handling

Pocket Poster/Views/Accessory Views/WebView.swift

@@ -11,21 +11,50 @@ import WebKit
 
 struct WallpaperWebView: UIViewRepresentable {
     let url: URL
+    @Binding var isLoading: Bool
+    @Binding var error: Error?
     
-    init(_ url: URL) {
+    init(_ url: URL, isLoading: Binding<Bool>, error: Binding<Error?>) {
         self.url = url
+        self._isLoading = isLoading
+        self._error = error
     }
     
+    func makeCoordinator() -> Coordinator {
+        Coordinator(self)
+    }
     func makeUIView(context: Context) -> some UIView {
         let configuration = WKWebViewConfiguration()
         configuration.setURLSchemeHandler(AssetsSchemeHandler(), forURLScheme: "pocketposter")
         let webView = WKWebView(frame: .zero, configuration: configuration)
+        webView.navigationDelegate = context.coordinator
         webView.load(URLRequest(url: url))
         
         return webView
     }
     
     func updateUIView(_ uiView: UIViewType, context: Context) {}
+    
+    class Coordinator: NSObject, WKNavigationDelegate {
+        var parent: WallpaperWebView
+        init(_ parent: WallpaperWebView) {
+            self.parent = parent
+        }
+        func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
+            parent.isLoading = true
+        }
+        func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
+            parent.isLoading = false
+        }
+        func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
+            return
+            let nsError = error as NSError
+            if nsError.code == NSURLErrorCancelled { return }
+            print("loading error: \(error)")
+            parent.isLoading = false
+            parent.error = error
+        }
+    }
 }