fix(iOS, Stack): Fix calculating insets for header title

ios/RNSScreenStackHeaderConfig.mm

@@ -264,7 +264,13 @@ - (void)updateHeaderStateInShadowTreeInContextOfNavigationBar:(nullable UINaviga
 - (NSDirectionalEdgeInsets)computeEdgeInsetsOfNavigationBar:(nonnull UINavigationBar *)navigationBar
 {
   NSDirectionalEdgeInsets navBarMargins = [navigationBar directionalLayoutMargins];
-  NSDirectionalEdgeInsets navBarContentMargins = [navigationBar.rnscreens_findContentView directionalLayoutMargins];
+  NSDirectionalEdgeInsets navBarContentMargins;
+  if (@available(iOS 26.0, *)) {
+    UIView *titleControl = [UINavigationBar findTitleControlInView:navigationBar];
+    navBarContentMargins = [navigationBar rnscreens_computeTotalEdgeInsetsForView:titleControl];
+  } else {
+    navBarContentMargins = [navigationBar.rnscreens_findContentView directionalLayoutMargins];
+  }
 
   BOOL isDisplayingBackButton = [self shouldBackButtonBeVisibleInNavigationBar:navigationBar];
 

ios/utils/UINavigationBar+RNSUtility.h

@@ -13,7 +13,7 @@ NS_ASSUME_NONNULL_BEGIN
  *
  * Tested to work reliably on iOS 18.0, 17.5, 15.5.
  *
- * @returns `_UINavigationBarContentView` view mounted directly under the navigation bar itself
+ * @return `_UINavigationBarContentView` view mounted directly under the navigation bar itself
  */
 - (nullable UIView *)rnscreens_findContentView;
 
@@ -27,11 +27,47 @@ NS_ASSUME_NONNULL_BEGIN
  *
  * Tested to work reliably on iOS 18.0, 17.5, 15.5.
  *
- * @returns `_UIButtonBarButton` view, if present and mounted in anticipated place;
+ * @return `_UIButtonBarButton` view, if present and mounted in anticipated place;
  *                      if the back button is not present, this method returns `nil`.
  */
 - (nullable UIView *)rnscreens_findBackButtonWrapperView;
 
+/**
+ * @brief Responsible for calculating the cumulative directional layout margins the will be applied to the title in the
+ * header.
+ *
+ * This method traverses the superview hierarchy, starting from the parent of the specified source view,
+ * and accumulates all `directionalLayoutMargins` until it reaches the `UINavigationBar`.
+ * The resulting insets represent the total margin space between the source view and its navigation container.
+ *
+ * Tested to work reliably on iOS 26.0, 18.5.
+ *
+ * @param sourceView The UIView from which to begin traversing up towards the navigation bar.
+ * @return `NSDirectionalEdgeInsets` containing the combined layout margins from the title control
+ * up to its ancestor navigation bar. Excluding the layout margins of both the:
+ * - source view - because we're positioning relatively to this view
+ * - `UINavigationBar` - because we're calculating it inside computeEdgeInsetsOfNavigationBar explicitly
+ */
+- (NSDirectionalEdgeInsets)rnscreens_computeTotalEdgeInsetsForView:(nullable UIView *)sourceView;
+
+/**
+ * @brief Responsible for searching the view hierarchy to locate the `_UINavigationBarTitleControl` view.
+ *
+ * This method traverses a subtree from given view, to find  `_UINavigationBarTitleControl`.
+ * `_UINavigationBarTitleControl` is a private API. Therefore, this method relies on the
+ * hardcoded class name which may change at any time.
+ *
+ * The method performs a DFS starting from the provided view.
+ * Once a matching title control is found, it is returned immediately. If not found,
+ * the method returns nil.
+ *
+ * Tested to work reliably on iOS 26.0, 18.5.
+ *
+ * @param view The root UIView from which to begin searching the view hierarchy.
+ * @return `UIView` instance representing the `_UINavigationBarTitleControl` or `nil`.
+ */
++ (UIView *)findTitleControlInView:(UIView *)view;
+
 @end
 
 NS_ASSUME_NONNULL_END

ios/utils/UINavigationBar+RNSUtility.mm

@@ -1,5 +1,7 @@
 #import "UINavigationBar+RNSUtility.h"
 
+#import <React/RCTLog.h>
+
 @implementation UINavigationBar (RNSUtility)
 
 - (nullable UIView *)rnscreens_findContentView
@@ -83,4 +85,43 @@ + (Class)rnscreens_getContentViewRuntimeClass
   return NSClassFromString(@"_UINavigationBarContentView"); // Sampled from iOS 17.5 (iPhone 15 Pro)
 }
 
+- (NSDirectionalEdgeInsets)rnscreens_computeTotalEdgeInsetsForView:(nullable UIView *)sourceView
+{
+  NSDirectionalEdgeInsets totalMargins = NSDirectionalEdgeInsetsMake(0, 0, 0, 0);
+
+  if (sourceView == nil) {
+    RCTLogWarn(@"[RNScreens] _UINavigationBarTitleControl not found under the UINavigationBar hierarchy");
+    return totalMargins;
+  }
+
+  UIView *currentView = sourceView.superview;
+  while (currentView != nil && currentView != self) {
+    NSDirectionalEdgeInsets margins = currentView.directionalLayoutMargins;
+    totalMargins.top += margins.top;
+    totalMargins.leading += margins.leading;
+    totalMargins.bottom += margins.bottom;
+    totalMargins.trailing += margins.trailing;
+    currentView = currentView.superview;
+  }
+  return totalMargins;
+}
+
++ (UIView *)findTitleControlInView:(UIView *)view
+{
+  static Class UINavBarTitleControlClass = NSClassFromString(@"_UINavigationBarTitleControl");
+
+  if ([view isKindOfClass:UINavBarTitleControlClass]) {
+    return view;
+  }
+
+  for (UIView *subview in view.subviews) {
+    UIView *result = [UINavigationBar findTitleControlInView:subview];
+    if (result) {
+      return result;
+    }
+  }
+
+  return nil;
+}
+
 @end