Fix handling hash change on iOS

See react-native-webview#24 andhttps://github.com/react-native-webview/pull/1082/files

ios/RNCWebView.m

@@ -15,6 +15,7 @@
 
 static NSTimer *keyboardTimer;
 static NSString *const MessageHandlerName = @"ReactNativeWebView";
+static NSString *const HistoryShimName = @"ReactNativeHistoryShim";
 static NSURLCredential* clientAuthenticationCredential;
 
 // runtime trick to remove WKWebView keyboard default toolbar
@@ -130,6 +131,32 @@ - (void)didMoveToWindow
     }
     wkWebViewConfig.userContentController = [WKUserContentController new];
 
+	    // Shim the HTML5 history API:
+    [wkWebViewConfig.userContentController addScriptMessageHandler:self name:HistoryShimName];
+    NSString *source = [NSString stringWithFormat:
+      @"(function(history) {\n"
+      "  function notify(type) {\n"
+      "    setTimeout(function() {\n"
+      "      window.webkit.messageHandlers.%@.postMessage(type)\n"
+      "    }, 0)\n"
+      "  }\n"
+      "  function shim(f) {\n"
+      "    return function pushState() {\n"
+      "      notify('other')\n"
+      "      return f.apply(history, arguments)\n"
+      "    }\n"
+      "  }\n"
+      "  history.pushState = shim(history.pushState)\n"
+      "  history.replaceState = shim(history.replaceState)\n"
+      "  window.addEventListener('popstate', function() {\n"
+      "    notify('backforward')\n"
+      "  })\n"
+      "})(window.history)\n", HistoryShimName
+    ];
+    WKUserScript *script = [[WKUserScript alloc] initWithSource:source injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:YES];
+    [wkWebViewConfig.userContentController addUserScript:script];
+
+
     if (_messagingEnabled) {
       [wkWebViewConfig.userContentController addScriptMessageHandler:self name:MessageHandlerName];
 
@@ -372,10 +399,21 @@ - (void)setContentInsetAdjustmentBehavior:(UIScrollViewContentInsetAdjustmentBeh
 - (void)userContentController:(WKUserContentController *)userContentController
        didReceiveScriptMessage:(WKScriptMessage *)message
 {
-  if (_onMessage != nil) {
+  if ([message.name isEqualToString:HistoryShimName]) {
     NSMutableDictionary<NSString *, id> *event = [self baseEvent];
-    [event addEntriesFromDictionary: @{@"data": message.body}];
-    _onMessage(event);
+    if (_onLoadingFinish) {
+      [event addEntriesFromDictionary: @{@"data": message.body}];
+	  NSMutableDictionary<NSString *, id> *event = [self baseEvent];
+      _onMessage(event);
+	  [event addEntriesFromDictionary: @{@"navigationType": message.body}];
+      _onLoadingFinish(event);
+    }
+  } else if ([message.name isEqualToString:MessageHandlerName]) {
+    if (_onMessage) {
+      NSMutableDictionary<NSString *, id> *event = [self baseEvent];
+      [event addEntriesFromDictionary: @{@"data": message.body}];
+      _onMessage(event);
+    }
   }
 }