[iOS] Replace UnimplementedView with UnimplementedNativeView

packages/react-native/React/Fabric/Mounting/ComponentViews/UnimplementedComponent/RCTUnimplementedNativeComponentView.mm

@@ -11,6 +11,8 @@
 #import <react/renderer/components/rncore/EventEmitters.h>
 #import <react/renderer/components/rncore/Props.h>
 
+#import "RCTFabricComponentsPlugins.h"
+
 using namespace facebook::react;
 
 @implementation RCTUnimplementedNativeComponentView {
@@ -56,4 +58,9 @@ - (void)updateProps:(const Props::Shared &)props oldProps:(const Props::Shared &
   [super updateProps:props oldProps:oldProps];
 }
 
+Class<RCTComponentViewProtocol> RCTUnimplementedNativeViewCls(void)
+{
+  return RCTUnimplementedNativeComponentView.class;
+}
+
 @end

packages/react-native/React/Fabric/Mounting/RCTComponentViewFactory.mm

@@ -36,7 +36,7 @@
 #import <React/RCTParagraphComponentView.h>
 #import <React/RCTRootComponentView.h>
 #import <React/RCTTextInputComponentView.h>
-#import <React/RCTUnimplementedViewComponentView.h>
+#import <React/RCTUnimplementedNativeComponentView.h>
 #import <React/RCTViewComponentView.h>
 
 #import <objc/runtime.h>
@@ -75,6 +75,7 @@ + (RCTComponentViewFactory *)currentComponentViewFactory
     componentViewFactory = [RCTComponentViewFactory new];
     [componentViewFactory registerComponentViewClass:[RCTRootComponentView class]];
     [componentViewFactory registerComponentViewClass:[RCTParagraphComponentView class]];
+    [componentViewFactory registerComponentViewClass:[RCTUnimplementedNativeComponentView class]];
 
     componentViewFactory->_providerRegistry.setComponentDescriptorProviderRequest(
         [](ComponentName requestedComponentName) {
@@ -158,18 +159,6 @@ - (BOOL)registerComponentIfPossible:(const std::string &)name
     return YES;
   }
 
-  // Fallback 4: use <UnimplementedView> if component doesn't exist.
-  auto flavor = std::make_shared<const std::string>(name);
-  auto componentName = ComponentName{flavor->c_str()};
-  auto componentHandle = reinterpret_cast<ComponentHandle>(componentName);
-  auto constructor = [RCTUnimplementedViewComponentView componentDescriptorProvider].constructor;
-
-  [self _addDescriptorToProviderRegistry:ComponentDescriptorProvider{
-                                             componentHandle, componentName, flavor, constructor}];
-
-  _componentViewClasses[componentHandle] =
-      [self _componentViewClassDescriptorFromClass:[RCTUnimplementedViewComponentView class]];
-
   // No matching class exists for `name`.
   return NO;
 }

packages/react-native/React/Fabric/RCTSurfacePresenter.mm

@@ -29,6 +29,7 @@
 #import <react/config/ReactNativeConfig.h>
 #import <react/featureflags/ReactNativeFeatureFlags.h>
 #import <react/renderer/componentregistry/ComponentDescriptorFactory.h>
+#import <react/renderer/components/rncore/ComponentDescriptors.h>
 #import <react/renderer/components/text/BaseTextProps.h>
 #import <react/renderer/runtimescheduler/RuntimeScheduler.h>
 #import <react/renderer/scheduler/AsynchronousEventBeat.h>
@@ -240,8 +241,13 @@ - (RCTScheduler *)_createScheduler
   auto componentRegistryFactory =
       [factory = wrapManagedObject(_mountingManager.componentViewRegistry.componentViewFactory)](
           const EventDispatcher::Weak &eventDispatcher, const ContextContainer::Shared &contextContainer) {
-        return [(RCTComponentViewFactory *)unwrapManagedObject(factory)
+        auto registry = [(RCTComponentViewFactory *)unwrapManagedObject(factory)
             createComponentDescriptorRegistryWithParameters:{eventDispatcher, contextContainer}];
+        auto &mutableRegistry = const_cast<ComponentDescriptorRegistry &>(*registry);
+        const ComponentDescriptorParameters &parametors = {eventDispatcher, contextContainer};
+        mutableRegistry.setFallbackComponentDescriptor(
+            std::make_shared<UnimplementedNativeViewComponentDescriptor>(parametors));
+        return registry;
       };
 
   auto runtimeExecutor = _runtimeExecutor;