feat(toggle scroll bar): added new props showsVerticalScrollIndicator / showsHorizontalScrollIndicator (#250)

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

     view.getSettings().setJavaScriptEnabled(enabled);
   }
 
+  @ReactProp(name = "showsHorizontalScrollIndicator")
+  public void setShowsHorizontalScrollIndicator(WebView view, boolean enabled) {
+    view.setHorizontalScrollBarEnabled(enabled);
+  }
+
+  @ReactProp(name = "showsVerticalScrollIndicator")
+  public void setShowsVerticalScrollIndicator(WebView view, boolean enabled) {
+    view.setVerticalScrollBarEnabled(enabled);
+  }
+  
   @ReactProp(name = "cacheEnabled")
   public void setCacheEnabled(WebView view, boolean enabled) {
     if (enabled) {

docs/Reference.md

 
 ---
 
+### `showsHorizontalScrollIndicator`
+
+Boolean value that determines whether a horizontal scroll indicator is shown in the `WebView`. The default value is `true`.
+
+| Type | Required |
+| ---- | -------- |
+| bool | No       |
+
+---
+
+### `showsVerticalScrollIndicator`
+
+Boolean value that determines whether a vertical scroll indicator is shown in the `WebView`. The default value is `true`.
+
+| Type | Required |
+| ---- | -------- |
+| bool | No       |
+
+---
+
 ### `geolocationEnabled`
 
 Set whether Geolocation is enabled in the `WebView`. The default value is `false`. Used only in Android.

ios/RNCUIWebViewManager.m

 RCT_REMAP_VIEW_PROPERTY(allowsInlineMediaPlayback, _webView.allowsInlineMediaPlayback, BOOL)
 RCT_REMAP_VIEW_PROPERTY(mediaPlaybackRequiresUserAction, _webView.mediaPlaybackRequiresUserAction, BOOL)
 RCT_REMAP_VIEW_PROPERTY(dataDetectorTypes, _webView.dataDetectorTypes, UIDataDetectorTypes)
+RCT_REMAP_VIEW_PROPERTY(showsHorizontalScrollIndicator, _webView.scrollView.showsHorizontalScrollIndicator, BOOL)
+RCT_REMAP_VIEW_PROPERTY(showsVerticalScrollIndicator, _webView.scrollView.showsVerticalScrollIndicator, BOOL)
 
 RCT_EXPORT_METHOD(goBack:(nonnull NSNumber *)reactTag)
 {

ios/RNCWKWebView.h

 @property (nonatomic, copy) NSString *userAgent;
 @property (nonatomic, assign) BOOL cacheEnabled;
 @property (nonatomic, assign) BOOL allowsLinkPreview;
+@property (nonatomic, assign) BOOL showsHorizontalScrollIndicator;
+@property (nonatomic, assign) BOOL showsVerticalScrollIndicator;
 
 + (void)setClientAuthenticationCredential:(nullable NSURLCredential*)credential;
 - (void)postMessage:(NSString *)message;

ios/RNCWKWebView.m

     super.backgroundColor = [UIColor clearColor];
     _bounces = YES;
     _scrollEnabled = YES;
+    _showsHorizontalScrollIndicator = YES;
+    _showsVerticalScrollIndicator = YES;
     _automaticallyAdjustContentInsets = YES;
     _contentInset = UIEdgeInsetsZero;
   }
     _webView.scrollView.scrollEnabled = _scrollEnabled;
     _webView.scrollView.pagingEnabled = _pagingEnabled;
     _webView.scrollView.bounces = _bounces;
+    _webView.scrollView.showsHorizontalScrollIndicator = _showsHorizontalScrollIndicator;
+    _webView.scrollView.showsVerticalScrollIndicator = _showsVerticalScrollIndicator;
     _webView.allowsLinkPreview = _allowsLinkPreview;
     [_webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionOld | NSKeyValueObservingOptionNew context:nil];
     _webView.allowsBackForwardNavigationGestures = _allowsBackForwardNavigationGestures;
   _webView.scrollView.scrollEnabled = scrollEnabled;
 }
 
+- (void)setShowsHorizontalScrollIndicator:(BOOL)showsHorizontalScrollIndicator
+{
+    _showsHorizontalScrollIndicator = showsHorizontalScrollIndicator;
+    _webView.scrollView.showsHorizontalScrollIndicator = showsHorizontalScrollIndicator;
+}
+
+- (void)setShowsVerticalScrollIndicator:(BOOL)showsVerticalScrollIndicator
+{
+    _showsVerticalScrollIndicator = showsVerticalScrollIndicator;
+    _webView.scrollView.showsVerticalScrollIndicator = showsVerticalScrollIndicator;
+}
+
 - (void)postMessage:(NSString *)message
 {
   NSDictionary *eventInitDict = @{@"data": message};

ios/RNCWKWebViewManager.m

   view.decelerationRate = json == nil ? UIScrollViewDecelerationRateNormal : [RCTConvert CGFloat: json];
 }
 
+RCT_CUSTOM_VIEW_PROPERTY(showsHorizontalScrollIndicator, BOOL, RNCWKWebView) {
+  view.showsHorizontalScrollIndicator = json == nil ? true : [RCTConvert BOOL: json];
+}
+
+RCT_CUSTOM_VIEW_PROPERTY(showsVerticalScrollIndicator, BOOL, RNCWKWebView) {
+  view.showsVerticalScrollIndicator = json == nil ? true : [RCTConvert BOOL: json];
+}
+
 RCT_EXPORT_METHOD(injectJavaScript:(nonnull NSNumber *)reactTag script:(NSString *)script)
 {
   [self.bridge.uiManager addUIBlock:^(__unused RCTUIManager *uiManager, NSDictionary<NSNumber *, RNCWKWebView *> *viewRegistry) {

js/WebView.android.js

         mixedContentMode={this.props.mixedContentMode}
         saveFormDataDisabled={this.props.saveFormDataDisabled}
         urlPrefixesForDefaultIntent={this.props.urlPrefixesForDefaultIntent}
+        showsHorizontalScrollIndicator={this.props.showsHorizontalScrollIndicator}
+        showsVerticalScrollIndicator={this.props.showsVerticalScrollIndicator}
         {...nativeConfig.props}
       />
     );

js/WebView.ios.js

         dataDetectorTypes={this.props.dataDetectorTypes}
         useSharedProcessPool={this.props.useSharedProcessPool}
         allowsLinkPreview={this.props.allowsLinkPreview}
+        showsHorizontalScrollIndicator={this.props.showsHorizontalScrollIndicator}
+        showsVerticalScrollIndicator={this.props.showsVerticalScrollIndicator}
         {...nativeConfig.props}
       />
     );

js/WebViewTypes.js

    */
   injectedJavaScript?: ?string,
 
+  /**
+   * Boolean value that determines whether a horizontal scroll indicator is
+   * shown in the `WebView`. The default value is `true`.
+   */
+  showsHorizontalScrollIndicator?: ?boolean,
+
+  /**
+   * Boolean value that determines whether a vertical scroll indicator is
+   * shown in the `WebView`. The default value is `true`.
+   */
+  showsVerticalScrollIndicator?: ?boolean,
+
   /**
    * Boolean that controls whether the web content is scaled to fit
    * the view and enables the user to change the scale. The default value