Fabric: Temporary workaround to enable commands in Fabric

Summary: This is a temporary workaround that we need only temporary and will get rid of soon.

Reviewed By: mdvacca

Differential Revision: D15501203

fbshipit-source-id: cec4891b6a185ea9e39f50bfedf9e1dae8993b66

React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.h

@@ -79,6 +79,11 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)finalizeUpdates:(RNComponentViewUpdateMask)updateMask NS_REQUIRES_SUPER;
 - (void)prepareForRecycle NS_REQUIRES_SUPER;
 
+/*
+ * This is a fragment of temporary workaround that we need only temporary and will get rid of soon.
+ */
+- (NSString *)componentViewName_DO_NOT_USE_THIS_IS_BROKEN;
+
 @end
 
 NS_ASSUME_NONNULL_END

React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.mm

@@ -564,4 +564,9 @@ static NSString *RCTRecursiveAccessibilityLabel(UIView *view)
   return _eventEmitter;
 }
 
+- (NSString *)componentViewName_DO_NOT_USE_THIS_IS_BROKEN
+{
+  return RCTNSStringFromString([[self class] componentDescriptorProvider].name);
+}
+
 @end

React/Modules/RCTUIManager.m

@@ -1065,6 +1065,25 @@ RCT_EXPORT_METHOD(dispatchViewManagerCommand:(nonnull NSNumber *)reactTag
 {
   RCTShadowView *shadowView = _shadowViewRegistry[reactTag];
   RCTComponentData *componentData = _componentDataByName[shadowView.viewName];
+
+  // Achtung! Achtung!
+  // This is a remarkably hacky and ugly workaround.
+  // We need this only temporary for some testing. We need this hack until Fabric fully implements command-execution pipeline.
+  // This does not affect non-Fabric apps.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wundeclared-selector"
+  if (!componentData) {
+    __block UIView *view;
+    RCTUnsafeExecuteOnMainQueueSync(^{
+      view = self->_viewRegistry[reactTag];
+    });
+    if ([view respondsToSelector:@selector(componentViewName_DO_NOT_USE_THIS_IS_BROKEN)]) {
+      NSString *name = [view performSelector:@selector(componentViewName_DO_NOT_USE_THIS_IS_BROKEN)];
+      componentData = _componentDataByName[[NSString stringWithFormat:@"RCT%@", name]];
+    }
+  }
+#pragma clang diagnostic pop
+
   Class managerClass = componentData.managerClass;
   RCTModuleData *moduleData = [_bridge moduleDataForName:RCTBridgeModuleNameForClass(managerClass)];
   id<RCTBridgeMethod> method = moduleData.methods[commandID];