Merge pull request marcuswestin#97 from ruslanskorb/patch-1

[Fix] Import <UIKit/UIWebView.h> for iOS + App crash when no handler for message from JS.

Author: marcuswestin

WebViewJavascriptBridge/WebViewJavascriptBridge.h

@@ -17,6 +17,7 @@
     #define WVJB_WEBVIEW_TYPE WebView
     #define WVJB_WEBVIEW_DELEGATE_TYPE NSObject
 #elif defined __IPHONE_OS_VERSION_MAX_ALLOWED
+    #import <UIKit/UIWebView.h>
     #define WVJB_PLATFORM_IOS
     #define WVJB_WEBVIEW_TYPE UIWebView
     #define WVJB_WEBVIEW_DELEGATE_TYPE NSObject<UIWebViewDelegate>

WebViewJavascriptBridge/WebViewJavascriptBridge.m

@@ -196,6 +196,10 @@ - (void)_flushMessageQueue {
                 }
             } else {
                 handler = _messageHandler;
+                if (!handler) {
+                    NSLog(@"WVJB Warning: No handler for message from JS: %@", message);
+                    return responseCallback(@{});
+                }
             }
 
             @try {