Fix iOS TextInput Dynamic Type audit support

Author: ya-nsh

packages/react-native/Libraries/Text/TextInput/RCTBackedTextInputViewProtocol.h

@@ -24,6 +24,7 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, weak, nullable) id<RCTBackedTextInputDelegate> textInputDelegate;
 @property (nonatomic, readonly) CGSize contentSize;
 @property (nonatomic, strong, nullable) NSDictionary<NSAttributedStringKey, id> *defaultTextAttributes;
+@property (nonatomic, assign) BOOL adjustsFontForContentSizeCategory;
 @property (nonatomic, assign) BOOL contextMenuHidden;
 @property (nonatomic, assign, getter=isEditable) BOOL editable;
 @property (nonatomic, assign) BOOL caretHidden;

packages/react-native/React/Fabric/Mounting/ComponentViews/TextInput/RCTTextInputComponentView.mm

@@ -42,6 +42,11 @@ @interface RCTTextInputComponentView () <
 
 static NSSet<NSNumber *> *returnKeyTypesSet;
 
+static BOOL RCTAdjustsFontForContentSizeCategoryFromTextAttributes(const TextAttributes &textAttributes)
+{
+  return textAttributes.allowFontScaling.value_or(true);
+}
+
 @implementation RCTTextInputComponentView {
   TextInputShadowNode::ConcreteState::Shared _state;
   UIView<RCTBackedTextInputViewProtocol> *_backedTextInputView;
@@ -92,6 +97,8 @@ - (instancetype)initWithFrame:(CGRect)frame
 
     _backedTextInputView = defaultProps->multiline ? [RCTUITextView new] : [RCTUITextField new];
     _backedTextInputView.textInputDelegate = self;
+    _backedTextInputView.adjustsFontForContentSizeCategory =
+        RCTAdjustsFontForContentSizeCategoryFromTextAttributes(defaultProps->textAttributes);
     _ignoreNextTextInputCall = NO;
     _comingFromJS = NO;
     _didMoveToWindow = NO;
@@ -145,6 +152,8 @@ - (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection
     const auto &newTextInputProps = static_cast<const TextInputProps &>(*_props);
     _backedTextInputView.defaultTextAttributes =
         RCTNSTextAttributesFromTextAttributes(newTextInputProps.getEffectiveTextAttributes(RCTFontSizeMultiplier()));
+    _backedTextInputView.adjustsFontForContentSizeCategory =
+        RCTAdjustsFontForContentSizeCategoryFromTextAttributes(newTextInputProps.textAttributes);
   }
 }
 
@@ -298,6 +307,8 @@ - (void)updateProps:(const Props::Shared &)props oldProps:(const Props::Shared &
     defaultAttributes[RCTAttributedStringEventEmitterKey] =
         _backedTextInputView.defaultTextAttributes[RCTAttributedStringEventEmitterKey];
     _backedTextInputView.defaultTextAttributes = defaultAttributes;
+    _backedTextInputView.adjustsFontForContentSizeCategory =
+        RCTAdjustsFontForContentSizeCategoryFromTextAttributes(newTextInputProps.textAttributes);
   }
 
   if (newTextInputProps.selectionColor != oldTextInputProps.selectionColor) {

packages/react-native/React/Fabric/Mounting/ComponentViews/TextInput/RCTTextInputUtils.mm

@@ -30,6 +30,7 @@ void RCTCopyBackedTextInput(
   toTextInput.textInputDelegate = fromTextInput.textInputDelegate;
   toTextInput.placeholderColor = fromTextInput.placeholderColor;
   toTextInput.defaultTextAttributes = fromTextInput.defaultTextAttributes;
+  toTextInput.adjustsFontForContentSizeCategory = fromTextInput.adjustsFontForContentSizeCategory;
   toTextInput.autocapitalizationType = fromTextInput.autocapitalizationType;
   toTextInput.autocorrectionType = fromTextInput.autocorrectionType;
   toTextInput.contextMenuHidden = fromTextInput.contextMenuHidden;

packages/rn-tester/js/examples/TextInput/TextInputExample.ios.js

@@ -762,7 +762,7 @@ const textInputExamples: Array<RNTesterModuleExample> = [
           />
           <ExampleTextInput
             style={{marginTop: 10}}
-            placeholder="allowFontScaling = false"
+            placeholder="allowFontScaling = true"
             allowFontScaling={true}
           />
         </View>