Use ReactRootViewTagGenerator for RN-iOS

Summary:
This builds upon  facebook#43882 and re-uses the C++ ReactRootViewTagGenerator for RN-iOS

Changelog: [Internal]

Differential Revision: D55876627

packages/react-native/React/Base/RCTRootView.m → packages/react-native/React/Base/RCTRootView.mm

@@ -10,6 +10,7 @@
 #import "RCTRootViewInternal.h"
 
 #import <objc/runtime.h>
+#import <react/renderer/core/ReactRootViewTagGenerator.h>
 
 #import "RCTAssert.h"
 #import "RCTBridge+Private.h"
@@ -30,16 +31,10 @@
 
 NSString *const RCTContentDidAppearNotification = @"RCTContentDidAppearNotification";
 
-@interface RCTUIManager (RCTRootView)
-
-- (NSNumber *)allocateRootTag;
-
-@end
-
 @implementation RCTRootView {
   RCTBridge *_bridge;
   NSString *_moduleName;
-  RCTRootContentView *_contentView;
+  UIView *_contentView;
   BOOL _passThroughTouches;
   CGSize _intrinsicContentSize;
 }
@@ -125,13 +120,13 @@ - (UIView *)view
 
 - (BOOL)passThroughTouches
 {
-  return _contentView.passThroughTouches;
+  return static_cast<RCTRootContentView *>(_contentView).passThroughTouches;
 }
 
 - (void)setPassThroughTouches:(BOOL)passThroughTouches
 {
   _passThroughTouches = passThroughTouches;
-  _contentView.passThroughTouches = passThroughTouches;
+  static_cast<RCTRootContentView *>(_contentView).passThroughTouches = passThroughTouches;
 }
 
 #pragma mark - Layout
@@ -166,9 +161,9 @@ - (void)setMinimumSize:(CGSize)minimumSize
   }
   _minimumSize = minimumSize;
   __block NSNumber *tag = self.reactTag;
-  __weak typeof(self) weakSelf = self;
+  __weak __typeof(self) weakSelf = self;
   RCTExecuteOnUIManagerQueue(^{
-    __strong typeof(self) strongSelf = weakSelf;
+    __strong __typeof(self) strongSelf = weakSelf;
     if (strongSelf && strongSelf->_bridge.isValid) {
       RCTRootShadowView *shadowView = (RCTRootShadowView *)[strongSelf->_bridge.uiManager shadowViewForReactTag:tag];
       shadowView.minimumSize = minimumSize;
@@ -189,22 +184,22 @@ - (BOOL)canBecomeFirstResponder
 - (void)setLoadingView:(UIView *)loadingView
 {
   _loadingView = loadingView;
-  if (!_contentView.contentHasAppeared) {
+  if (!static_cast<RCTRootContentView *>(_contentView).contentHasAppeared) {
     [self showLoadingView];
   }
 }
 
 - (void)showLoadingView
 {
-  if (_loadingView && !_contentView.contentHasAppeared) {
+  if (_loadingView && !static_cast<RCTRootContentView *>(_contentView).contentHasAppeared) {
     _loadingView.hidden = NO;
     [self addSubview:_loadingView];
   }
 }
 
 - (void)hideLoadingView
 {
-  if (_loadingView.superview == self && _contentView.contentHasAppeared) {
+  if (_loadingView.superview == self && static_cast<RCTRootContentView *>(_contentView).contentHasAppeared) {
     if (_loadingViewFadeDuration > 0) {
       dispatch_after(
           dispatch_time(DISPATCH_TIME_NOW, (int64_t)(_loadingViewFadeDelay * NSEC_PER_SEC)),
@@ -232,13 +227,10 @@ - (NSNumber *)reactTag
   RCTAssertMainQueue();
   if (!super.reactTag) {
     /**
-     * Every root view that is created must have a unique react tag.
-     * Numbering of these tags goes from 1, 11, 21, 31, etc
-     *
      * NOTE: Since the bridge persists, the RootViews might be reused, so the
      * react tag must be re-assigned every time a new UIManager is created.
      */
-    self.reactTag = RCTAllocateRootViewTag();
+    self.reactTag = @(facebook::react::getNextRootViewTag());
   }
   return super.reactTag;
 }
@@ -257,7 +249,7 @@ - (void)javaScriptDidLoad:(NSNotification *)notification
   // Use the (batched) bridge that's sent in the notification payload, so the
   // RCTRootContentView is scoped to the right bridge
   RCTBridge *bridge = notification.userInfo[@"bridge"];
-  if (bridge != _contentView.bridge) {
+  if (bridge != static_cast<RCTRootContentView *>(_contentView).bridge) {
     [self bundleFinishedLoading:bridge];
   }
 }
@@ -276,7 +268,7 @@ - (void)bundleFinishedLoading:(RCTBridge *)bridge
                                            sizeFlexibility:_sizeFlexibility];
   [self runApplication:bridge];
 
-  _contentView.passThroughTouches = _passThroughTouches;
+  static_cast<RCTRootContentView *>(_contentView).passThroughTouches = _passThroughTouches;
   [self insertSubview:_contentView atIndex:0];
 
   if (_sizeFlexibility == RCTRootViewSizeFlexibilityNone) {
@@ -304,7 +296,7 @@ - (void)setSizeFlexibility:(RCTRootViewSizeFlexibility)sizeFlexibility
 
   _sizeFlexibility = sizeFlexibility;
   [self setNeedsLayout];
-  _contentView.sizeFlexibility = _sizeFlexibility;
+  static_cast<RCTRootContentView *>(_contentView).sizeFlexibility = _sizeFlexibility;
 }
 
 - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
@@ -382,7 +374,7 @@ - (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection
 
 - (void)dealloc
 {
-  [_contentView invalidate];
+  [static_cast<RCTRootContentView *>(_contentView) invalidate];
 }
 
 @end
@@ -398,7 +390,7 @@ - (CGSize)intrinsicSize
 - (void)cancelTouches
 {
   RCTLogWarn(@"`-[RCTRootView cancelTouches]` is deprecated and will be deleted soon.");
-  [[_contentView touchHandler] cancel];
+  [[static_cast<RCTRootContentView *>(_contentView) touchHandler] cancel];
 }
 
 @end

packages/react-native/React/Base/Surface/RCTSurface.mm

@@ -8,9 +8,9 @@
 #import "RCTSurface.h"
 #import "RCTSurfaceView+Internal.h"
 
-#import <mutex>
-
+#import <react/renderer/core/ReactRootViewTagGenerator.h>
 #import <stdatomic.h>
+#import <mutex>
 
 #import "RCTAssert.h"
 #import "RCTBridge+Private.h"
@@ -73,7 +73,7 @@ - (instancetype)initWithBridge:(RCTBridge *)bridge
     _batchedBridge = [_bridge batchedBridge] ?: _bridge;
     _moduleName = moduleName;
     _properties = [initialProperties copy];
-    _rootViewTag = RCTAllocateRootViewTag();
+    _rootViewTag = @(facebook::react::getNextRootViewTag());
 
     _rootShadowViewDidStartRenderingSemaphore = dispatch_semaphore_create(0);
     _rootShadowViewDidStartLayingOutSemaphore = dispatch_semaphore_create(0);

packages/react-native/React/Fabric/Surface/RCTFabricSurface.mm

@@ -22,6 +22,7 @@
 #import <React/RCTSurfaceView.h>
 #import <React/RCTUIManagerUtils.h>
 #import <React/RCTUtils.h>
+#import <react/renderer/core/ReactRootViewTagGenerator.h>
 #import <react/renderer/mounting/MountingCoordinator.h>
 
 #import "RCTSurfacePresenter.h"
@@ -56,8 +57,7 @@ - (instancetype)initWithSurfacePresenter:(RCTSurfacePresenter *)surfacePresenter
   if (self = [super init]) {
     _surfacePresenter = surfacePresenter;
 
-    _surfaceHandler =
-        SurfaceHandler{RCTStringFromNSString(moduleName), (SurfaceId)[RCTAllocateRootViewTag() integerValue]};
+    _surfaceHandler = SurfaceHandler{RCTStringFromNSString(moduleName), getNextRootViewTag()};
     _surfaceHandler->setProps(convertIdToFollyDynamic(initialProperties));
 
     [_surfacePresenter registerSurface:self];

packages/react-native/React/Modules/RCTUIManagerUtils.h

@@ -98,8 +98,3 @@ RCT_EXTERN void RCTUnsafeExecuteOnUIManagerQueueSync(dispatch_block_t block);
 #define RCTAssertUIManagerQueue() \
   RCTAssert(                      \
       RCTIsUIManagerQueue() || RCTIsPseudoUIManagerQueue(), @"This function must be called on the UIManager queue")
-
-/**
- * Returns new unique root view tag.
- */
-RCT_EXTERN NSNumber *RCTAllocateRootViewTag(void);

packages/react-native/React/Modules/RCTUIManagerUtils.m

@@ -94,11 +94,3 @@ void RCTUnsafeExecuteOnUIManagerQueueSync(dispatch_block_t block)
     }
   }
 }
-
-NSNumber *RCTAllocateRootViewTag(void)
-{
-  // Keep in sync with ReactRootViewTagGenerator.h - see that file for an explanation on why the
-  // increment here is 10.
-  static _Atomic int64_t rootViewTagCounter = 0;
-  return @(atomic_fetch_add_explicit(&rootViewTagCounter, 1, memory_order_relaxed) * 10 + 1);
-}