Attempting to add multiple message handlers.

ios/RNCWebView.h

 @property (nonatomic, weak) id<RNCWebViewDelegate> _Nullable delegate;
 @property (nonatomic, copy) NSDictionary * _Nullable source;
 @property (nonatomic, assign) BOOL messagingEnabled;
+@property (nonatomic, copy) NSArray  * _Nullable messageHandlers;
 @property (nonatomic, copy) NSString * _Nullable injectedJavaScript;
 @property (nonatomic, copy) NSString * _Nullable injectedJavaScriptBeforeContentLoaded;
 @property (nonatomic, assign) BOOL scrollEnabled;

ios/RNCWebView.m

     [wkWebViewConfig.userContentController addUserScript:script];
 
     if (_messagingEnabled) {
+        for (NSString *handler in _messageHandlers)
+        {
+            [wkWebViewConfig.userContentController addScriptMessageHandler:[[RNCWeakScriptMessageDelegate alloc] initWithDelegate:self]
+            name:handler];
+        }
+        
       [wkWebViewConfig.userContentController addScriptMessageHandler:[[RNCWeakScriptMessageDelegate alloc] initWithDelegate:self]
                                                                 name:MessageHandlerName];
 
         _onHttpError(event);
       }
     }
-  }  
+  }
 
   decisionHandler(WKNavigationResponsePolicyAllow);
 }

ios/RNCWebViewManager.m

  * Expose methods to enable messaging the webview.
  */
 RCT_EXPORT_VIEW_PROPERTY(messagingEnabled, BOOL)
+RCT_EXPORT_VIEW_PROPERTY(messageHandlers, NSArray)
 RCT_EXPORT_VIEW_PROPERTY(onMessage, RCTDirectEventBlock)
 RCT_EXPORT_VIEW_PROPERTY(onScroll, RCTDirectEventBlock)