[iOS] Fabric: Add TextInput showSoftInputOnFocus support

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

@@ -191,6 +191,10 @@ - (void)updateProps:(const Props::Shared &)props oldProps:(const Props::Shared &
         RCTUITextSmartInsertDeleteTypeFromOptionalBool(newTextInputProps.traits.smartInsertDelete);
   }
 
+  if (newTextInputProps.traits.showSoftInputOnFocus != oldTextInputProps.traits.showSoftInputOnFocus) {
+    [self _setShowSoftInputOnFocus:newTextInputProps.traits.showSoftInputOnFocus];
+  }
+
   // Traits `blurOnSubmit`, `clearTextOnFocus`, and `selectTextOnFocus` were omitted intentionally here
   // because they are being checked on-demand.
 
@@ -692,6 +696,23 @@ - (BOOL)_textOf:(NSAttributedString *)newText equals:(NSAttributedString *)oldTe
   }
 }
 
+- (void)_setShowSoftInputOnFocus:(BOOL)showSoftInputOnFocus
+{
+  if (showSoftInputOnFocus) {
+    // Resets to default keyboard.
+    _backedTextInputView.inputView = nil;
+
+    // Without the call to reloadInputViews, the keyboard will not change until the textInput field (the first
+    // responder) loses and regains focus.
+    if (_backedTextInputView.isFirstResponder) {
+      [_backedTextInputView reloadInputViews];
+    }
+  } else {
+    // Hides keyboard, but keeps blinking cursor.
+    _backedTextInputView.inputView = [UIView new];
+  }
+}
+
 - (SubmitBehavior)getSubmitBehavior
 {
   const auto &props = static_cast<const TextInputProps &>(*_props);