[webview_flutter]Adding error message display on iOS WebView

packages/webview_flutter/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.1.0+2
+
+* Add error display on both iOS and Android when failing to load (e.g. due to 'ATS' on iOS or ssl error on Android).
+
 ## 0.1.0+1
 
 * Fix null crash when initialUrl is unset on iOS.

packages/webview_flutter/android/src/main/java/io/flutter/plugins/webviewflutter/FlutterWebView.java

@@ -1,8 +1,12 @@
 package io.flutter.plugins.webviewflutter;
 
 import android.content.Context;
+import android.net.http.SslError;
+import android.util.Log;
 import android.view.View;
+import android.webkit.SslErrorHandler;
 import android.webkit.WebView;
+import android.webkit.WebViewClient;
 import io.flutter.plugin.common.BinaryMessenger;
 import io.flutter.plugin.common.MethodCall;
 import io.flutter.plugin.common.MethodChannel;
@@ -18,6 +22,7 @@ public class FlutterWebView implements PlatformView, MethodCallHandler {
   @SuppressWarnings("unchecked")
   FlutterWebView(Context context, BinaryMessenger messenger, int id, Map<String, Object> params) {
     webView = new WebView(context);
+    webView.setWebViewClient(new FlutterWebViewClient());
     if (params.containsKey("initialUrl")) {
       String url = (String) params.get("initialUrl");
       webView.loadUrl(url);
@@ -120,3 +125,11 @@ private void updateJsMode(int mode) {
   @Override
   public void dispose() {}
 }
+
+class FlutterWebViewClient extends WebViewClient {
+  @Override
+  public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
+    super.onReceivedSslError(view, handler, error);
+    Log.e("webview_flutter", error.toString());
+  }
+}

packages/webview_flutter/ios/Classes/FlutterWebView.h

@@ -3,7 +3,7 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-@interface FLTWebViewController : NSObject <FlutterPlatformView>
+@interface FLTWebViewController : NSObject <FlutterPlatformView, WKNavigationDelegate>
 
 - (instancetype)initWithFrame:(CGRect)frame
                viewIdentifier:(int64_t)viewId

packages/webview_flutter/ios/Classes/FlutterWebView.m

@@ -41,6 +41,7 @@ - (instancetype)initWithFrame:(CGRect)frame
   if ([super init]) {
     _viewId = viewId;
     _webView = [[WKWebView alloc] initWithFrame:frame];
+    _webView.navigationDelegate = self;
     NSString* channelName = [NSString stringWithFormat:@"plugins.flutter.io/webview_%lld", viewId];
     _channel = [FlutterMethodChannel methodChannelWithName:channelName binaryMessenger:messenger];
     __weak __typeof__(self) weakSelf = self;
@@ -150,4 +151,18 @@ - (bool)loadUrl:(NSString*)url {
   return true;
 }
 
+#pragma mark -
+#pragma mark WKNavigationDelegate
+- (void)webView:(WKWebView*)webView
+    didFailNavigation:(WKNavigation*)navigation
+            withError:(NSError*)error {
+  NSLog(@"%@", error.description);
+}
+
+- (void)webView:(WKWebView*)webView
+    didFailProvisionalNavigation:(WKNavigation*)navigation
+                       withError:(NSError*)error {
+  NSLog(@"%@", error.description);
+}
+
 @end

packages/webview_flutter/pubspec.yaml

@@ -1,6 +1,6 @@
 name: webview_flutter
 description: A Flutter plugin that provides a WebView widget on Android and iOS.
-version: 0.1.0+1
+version: 0.1.0+2
 author: Flutter Team <[email protected]>
 homepage: https://github.com/flutter/plugins/tree/master/packages/webview_flutter