[webview_flutter] Added basic support to load html data on both platform

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

@@ -18,9 +18,13 @@ public class FlutterWebView implements PlatformView, MethodCallHandler {
   @SuppressWarnings("unchecked")
   FlutterWebView(Context context, BinaryMessenger messenger, int id, Map<String, Object> params) {
     webView = new WebView(context);
-    if (params.containsKey("initialUrl")) {
-      String url = (String) params.get("initialUrl");
+    String url = (String) params.get("initialUrl");
+    String htmlData = (String) params.get("htmlData");
+    if (params.containsKey("initialUrl") && url != null) {
       webView.loadUrl(url);
+    } else if (params.containsKey("htmlData") && htmlData != null){
+      // We might have to add more parameters on dart side to ask baseURL
+      webView.loadData(htmlData, "text/html",  "UTF-8"); 
     }
     applySettings((Map<String, Object>) params.get("settings"));
     methodChannel = new MethodChannel(messenger, "plugins.flutter.io/webview_" + id);

packages/webview_flutter/example/ios/Runner.xcodeproj/project.pbxproj

@@ -20,6 +20,7 @@
 		97C146FC1CF9000F007C117D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FA1CF9000F007C117D /* Main.storyboard */; };
 		97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FD1CF9000F007C117D /* Assets.xcassets */; };
 		97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */; };
+		C1E6CAF49F4A1271A5C38490 /* libPods-Runner.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 146E5B7D54A1F480CCA2D653 /* libPods-Runner.a */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -38,6 +39,7 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
+		146E5B7D54A1F480CCA2D653 /* libPods-Runner.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = "libPods-Runner.a"; sourceTree = BUILT_PRODUCTS_DIR; };
 		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
 		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
 		2D5378251FAA1A9400D5DBA9 /* flutter_assets */ = {isa = PBXFileReference; lastKnownFileType = folder; name = flutter_assets; path = Flutter/flutter_assets; sourceTree = SOURCE_ROOT; };
@@ -64,12 +66,28 @@
 			files = (
 				9705A1C61CF904A100538489 /* Flutter.framework in Frameworks */,
 				3B80C3941E831B6300D905FE /* App.framework in Frameworks */,
+				C1E6CAF49F4A1271A5C38490 /* libPods-Runner.a in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		563DEEBCB75A795504F004FF /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+				146E5B7D54A1F480CCA2D653 /* libPods-Runner.a */,
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
+		63EC36BF727938D8B21D4E7D /* Pods */ = {
+			isa = PBXGroup;
+			children = (
+			);
+			name = Pods;
+			sourceTree = "<group>";
+		};
 		9740EEB11CF90186004384FC /* Flutter */ = {
 			isa = PBXGroup;
 			children = (
@@ -90,7 +108,8 @@
 				9740EEB11CF90186004384FC /* Flutter */,
 				97C146F01CF9000F007C117D /* Runner */,
 				97C146EF1CF9000F007C117D /* Products */,
-				CF3B75C9A7D2FA2A4C99F110 /* Frameworks */,
+				63EC36BF727938D8B21D4E7D /* Pods */,
+				563DEEBCB75A795504F004FF /* Frameworks */,
 			);
 			sourceTree = "<group>";
 		};
@@ -133,12 +152,14 @@
 			isa = PBXNativeTarget;
 			buildConfigurationList = 97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */;
 			buildPhases = (
+				3E0E965F102EF561521AD1DB /* [CP] Check Pods Manifest.lock */,
 				9740EEB61CF901F6004384FC /* Run Script */,
 				97C146EA1CF9000F007C117D /* Sources */,
 				97C146EB1CF9000F007C117D /* Frameworks */,
 				97C146EC1CF9000F007C117D /* Resources */,
 				9705A1C41CF9048500538489 /* Embed Frameworks */,
 				3B06AD1E1E4923F5004D2608 /* Thin Binary */,
+				92680763791C92D94C8D82BA /* [CP] Embed Pods Frameworks */,
 			);
 			buildRules = (
 			);
@@ -212,6 +233,50 @@
 			shellPath = /bin/sh;
 			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" thin";
 		};
+		3E0E965F102EF561521AD1DB /* [CP] Check Pods Manifest.lock */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+			);
+			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
+			);
+			name = "[CP] Check Pods Manifest.lock";
+			outputFileListPaths = (
+			);
+			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-Runner-checkManifestLockResult.txt",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
+			showEnvVarsInLog = 0;
+		};
+		92680763791C92D94C8D82BA /* [CP] Embed Pods Frameworks */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+			);
+			inputPaths = (
+				"${SRCROOT}/Pods/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh",
+				"${PODS_ROOT}/../.symlinks/flutter/ios/Flutter.framework",
+			);
+			name = "[CP] Embed Pods Frameworks";
+			outputFileListPaths = (
+			);
+			outputPaths = (
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Flutter.framework",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "\"${SRCROOT}/Pods/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh\"\n";
+			showEnvVarsInLog = 0;
+		};
 		9740EEB61CF901F6004384FC /* Run Script */ = {
 			isa = PBXShellScriptBuildPhase;
 			buildActionMask = 2147483647;

packages/webview_flutter/example/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

packages/webview_flutter/example/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>BuildSystemType</key>
+	<string>Original</string>
+</dict>
+</plist>

packages/webview_flutter/example/lib/main.dart

@@ -25,6 +25,7 @@ class WebViewExample extends StatelessWidget {
       ),
       body: WebView(
         initialUrl: 'https://flutter.io',
+        htmlData: "<h1>Dispayed a custom html text here.</h1>",
         javascriptMode: JavascriptMode.unrestricted,
         onWebViewCreated: (WebViewController webViewController) {
           _controller.complete(webViewController);

packages/webview_flutter/ios/Classes/FlutterWebView.m

@@ -51,8 +51,11 @@ - (instancetype)initWithFrame:(CGRect)frame
     NSDictionary<NSString*, id>* settings = args[@"settings"];
     [self applySettings:settings];
     NSString* initialUrl = args[@"initialUrl"];
+    NSString* htmlData = args[@"htmlData"];
     if (initialUrl && ![initialUrl isKindOfClass:[NSNull class]]) {
       [self loadUrl:initialUrl];
+    } else if(htmlData && ![htmlData isKindOfClass:[NSNull class]]){
+      [self loadHTMLString:htmlData];
     }
   }
   return self;
@@ -189,4 +192,9 @@ - (bool)loadUrl:(NSString*)url {
   return true;
 }
 
+- (void)loadHTMLString:(NSString*)htmlData {
+    // We might have to add more parameters on dart side to ask baseURL
+    [_webView loadHTMLString:htmlData baseURL: nil];
+}
+
 @end

packages/webview_flutter/lib/webview_flutter.dart

@@ -31,6 +31,7 @@ class WebView extends StatefulWidget {
     Key key,
     this.onWebViewCreated,
     this.initialUrl,
+    this.htmlData,
     this.javascriptMode = JavascriptMode.disabled,
     this.gestureRecognizers,
   })  : assert(javascriptMode != null),
@@ -53,6 +54,9 @@ class WebView extends StatefulWidget {
   /// The initial URL to load.
   final String initialUrl;
 
+  /// Html data that should be loaded once the web view is created.
+  final String htmlData;
+
   /// Whether Javascript execution is enabled.
   final JavascriptMode javascriptMode;
 
@@ -126,21 +130,24 @@ class _WebViewState extends State<WebView> {
 }
 
 class _CreationParams {
-  _CreationParams({this.initialUrl, this.settings});
+  _CreationParams({this.initialUrl, this.htmlData, this.settings});
 
   static _CreationParams fromWidget(WebView widget) {
     return _CreationParams(
       initialUrl: widget.initialUrl,
+      htmlData: widget.htmlData,
       settings: _WebSettings.fromWidget(widget),
     );
   }
 
   final String initialUrl;
+  final String htmlData;
   final _WebSettings settings;
 
   Map<String, dynamic> toMap() {
     return <String, dynamic>{
       'initialUrl': initialUrl,
+      'htmlData': htmlData,
       'settings': settings.toMap(),
     };
   }

packages/webview_flutter/test/webview_flutter_test.dart

@@ -40,6 +40,20 @@ void main() {
     expect(await controller.currentUrl(), 'https://youtube.com');
   });
 
+  testWidgets('Load HTML Data', (WidgetTester tester) async {
+    WebViewController controller;
+    await tester.pumpWidget(
+      WebView(
+        htmlData: "<h1>Hello</h1>",
+        onWebViewCreated: (WebViewController webViewController) {
+          controller = webViewController;
+        },
+      ),
+    );
+    //todo dont know what to expect here.
+    expect(await controller.currentUrl(), 'https://youtube.com');
+  });
+
   testWidgets('Javascript mode', (WidgetTester tester) async {
     await tester.pumpWidget(const WebView(
       initialUrl: 'https://youtube.com',