feat(iOS/Android): Add `cacheEnabled` prop (#152)

Added a new cacheEnabled prop to toggle Android & iOS webview caching behavior.

BREAKING CHANGE:  This change makes caching enabled by default when previously there was no caching behavior which may cause unexpected behaviour changes in your existing implementations.

android/src/main/java/com/reactnativecommunity/webview/RNCWebViewManager.java

 package com.reactnativecommunity.webview;
 
+import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.DownloadManager;
 import android.content.Context;
+
 import com.facebook.react.uimanager.UIManagerModule;
 
 import java.net.MalformedURLException;
       return new RNCWebViewBridge(webView);
     }
 
+    @SuppressLint("AddJavascriptInterface")
     public void setMessagingEnabled(boolean enabled) {
       if (messagingEnabled == enabled) {
         return;
     view.getSettings().setJavaScriptEnabled(enabled);
   }
 
+  @ReactProp(name = "cacheEnabled")
+  public void setCacheEnabled(WebView view, boolean enabled) {
+    if (enabled) {
+      Context ctx = view.getContext();
+      if (ctx != null) {
+        view.getSettings().setAppCachePath(ctx.getCacheDir().getAbsolutePath());
+        view.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
+        view.getSettings().setAppCacheEnabled(true);
+      }
+    } else {
+      view.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
+      view.getSettings().setAppCacheEnabled(false);
+    }
+  }
+
   @ReactProp(name = "androidHardwareAccelerationDisabled")
   public void setHardwareAccelerationDisabled(WebView view, boolean disabled) {
     if (disabled) {

docs/Reference.md

 - [`incognito`](Reference.md#incognito)
 - [`allowFileAccess`](Reference.md#allowFileAccess)
 - [`saveFormDataDisabled`](Reference.md#saveFormDataDisabled)
+- [`cacheEnabled`](Reference.md#cacheEnabled)
 - [`pagingEnabled`](Reference.md#pagingEnabled)
 - [`allowsLinkPreview`](Reference.md#allowsLinkPreview)
 
 
 Sets the user-agent for the `WebView`. This will only work for iOS if you are using WKWebView, not UIWebView (see https://developer.apple.com/documentation/webkit/wkwebview/1414950-customuseragent).
 
-| Type   | Required | Platform |
-| ------ | -------- | -------- |
-| string | No       | Android, iOS WKWebView  |
+| Type   | Required | Platform               |
+| ------ | -------- | ---------------------- |
+| string | No       | Android, iOS WKWebView |
 
 ---
 
 
 ---
 
+### `cacheEnabled`
+
+Sets whether WebView & WKWebView should use browser caching.
+
+| Type    | Required | Default |
+| ------- | -------- | ------- |
+| boolean | No       | true    |
+
+---
+
 ### `pagingEnabled`
 
 If the value of this property is true, the scroll view stops on multiples of the scroll view’s bounds when the user scrolls. The default value is false.

ios/RNCWKWebView.h

 @property (nonatomic, assign) BOOL incognito;
 @property (nonatomic, assign) BOOL useSharedProcessPool;
 @property (nonatomic, copy) NSString *userAgent;
+@property (nonatomic, assign) BOOL cacheEnabled;
 @property (nonatomic, assign) BOOL allowsLinkPreview;
 
 - (void)postMessage:(NSString *)message;

ios/RNCWKWebView.m

     WKWebViewConfiguration *wkWebViewConfig = [WKWebViewConfiguration new];
     if (_incognito) {
       wkWebViewConfig.websiteDataStore = [WKWebsiteDataStore nonPersistentDataStore];
+    } else if (_cacheEnabled) {
+      wkWebViewConfig.websiteDataStore = [WKWebsiteDataStore defaultDataStore];
     }
     if(self.useSharedProcessPool) {
-        wkWebViewConfig.processPool = [[RNCWKProcessPoolManager sharedManager] sharedProcessPool];
+      wkWebViewConfig.processPool = [[RNCWKProcessPoolManager sharedManager] sharedProcessPool];
     }
     wkWebViewConfig.userContentController = [WKUserContentController new];
     [wkWebViewConfig.userContentController addScriptMessageHandler: self name: MessageHanderName];

ios/RNCWKWebViewManager.m

 RCT_EXPORT_VIEW_PROPERTY(incognito, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(pagingEnabled, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(userAgent, NSString)
+RCT_EXPORT_VIEW_PROPERTY(cacheEnabled, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(allowsLinkPreview, BOOL)
 
 /**

js/WebView.android.js

   StyleSheet,
   UIManager,
   View,
-  NativeModules
+  NativeModules,
 } from 'react-native';
 
 import invariant from 'fbjs/lib/invariant';
     scalesPageToFit: true,
     allowFileAccess: false,
     saveFormDataDisabled: false,
+    cacheEnabled: true,
     androidHardwareAccelerationDisabled: false,
     originWhitelist: defaultOriginWhitelist,
   };
   static isFileUploadSupported = async () => {
     // native implementation should return "true" only for Android 5+
     return NativeModules.RNCWebView.isFileUploadSupported();
-  }
+  };
 
   state = {
     viewState: this.props.startInLoadingState
         injectedJavaScript={this.props.injectedJavaScript}
         userAgent={this.props.userAgent}
         javaScriptEnabled={this.props.javaScriptEnabled}
-        androidHardwareAccelerationDisabled={this.props.androidHardwareAccelerationDisabled}
+        androidHardwareAccelerationDisabled={
+          this.props.androidHardwareAccelerationDisabled
+        }
         thirdPartyCookiesEnabled={this.props.thirdPartyCookiesEnabled}
         domStorageEnabled={this.props.domStorageEnabled}
         messagingEnabled={typeof this.props.onMessage === 'function'}
+        cacheEnabled={this.props.cacheEnabled}
         onMessage={this.onMessage}
         overScrollMode={this.props.overScrollMode}
         contentInset={this.props.contentInset}

js/WebView.ios.js

 
   static defaultProps = {
     useWebKit: true,
+    cacheEnabled: true,
     originWhitelist: defaultOriginWhitelist,
     useSharedProcessPool: true,
   };
   static isFileUploadSupported = async () => {
     // no native implementation for iOS, depends only on permissions
     return true;
-  }
+  };
 
   state = {
     viewState: this.props.startInLoadingState
       );
     }
 
-    if (
-      !this.props.useWebKit &&
-      this.props.incognito
-    ) {
+    if (!this.props.useWebKit && this.props.incognito) {
       console.warn(
         'The incognito property is not supported when useWebKit = false',
       );
         bounces={this.props.bounces}
         scrollEnabled={this.props.scrollEnabled}
         pagingEnabled={this.props.pagingEnabled}
+        cacheEnabled={this.props.cacheEnabled}
         decelerationRate={decelerationRate}
         contentInset={this.props.contentInset}
         automaticallyAdjustContentInsets={
           this.props.automaticallyAdjustContentInsets
         }
         hideKeyboardAccessoryView={this.props.hideKeyboardAccessoryView}
-        allowsBackForwardNavigationGestures={this.props.allowsBackForwardNavigationGestures}
+        allowsBackForwardNavigationGestures={
+          this.props.allowsBackForwardNavigationGestures
+        }
         incognito={this.props.incognito}
         userAgent={this.props.userAgent}
         onLoadingStart={this._onLoadingStart}

js/WebViewTypes.js

    */
   nativeConfig?: ?WebViewNativeConfig,
 
+  /**
+   * Should caching be enabled. Default is true.
+   */
+  cacheEnabled?: ?boolean,
+
   style?: ViewStyleProp,
   children: Node,
 |}>;