Fix iOS 18.2+ back gesture conflict with PagerView

ios/PagerScrollDelegate.swift

@@ -3,10 +3,14 @@ import UIKit
 /**
  Scroll delegate used to control underlying TabView's collection view.
  */
-class PagerScrollDelegate: NSObject, UIScrollViewDelegate, UICollectionViewDelegate {
+class PagerScrollDelegate: NSObject, UIScrollViewDelegate, UICollectionViewDelegate, UIGestureRecognizerDelegate {
   weak var originalDelegate: UICollectionViewDelegate?
   weak var delegate: PagerViewProviderDelegate?
   var orientation: UICollectionView.ScrollDirection = .horizontal
+  weak var collectionView: UICollectionView?
+  var currentPage: Int = 0
+  var layoutDirection: PagerLayoutDirection = .ltr
+  var scrollEnabled: Bool = true
 
   private let handledSelectors: Set<Selector> = [
     #selector(scrollViewDidScroll(_:)),
@@ -46,6 +50,10 @@ class PagerScrollDelegate: NSObject, UIScrollViewDelegate, UICollectionViewDeleg
 
   func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
     delegate?.onPageScrollStateChanged(state: .idle)
+    // Re-enable pan gesture recognizer after decelerating ends
+    if let collectionView = collectionView, !collectionView.panGestureRecognizer.isEnabled {
+      collectionView.panGestureRecognizer.isEnabled = scrollEnabled
+    }
     originalDelegate?.scrollViewDidEndDecelerating?(scrollView)
   }
 
@@ -58,6 +66,10 @@ class PagerScrollDelegate: NSObject, UIScrollViewDelegate, UICollectionViewDeleg
     if !decelerate {
       delegate?.onPageScrollStateChanged(state: .idle)
     }
+    // Re-enable pan gesture recognizer after dragging ends
+    if let collectionView = collectionView, !collectionView.panGestureRecognizer.isEnabled {
+      collectionView.panGestureRecognizer.isEnabled = scrollEnabled
+    }
     originalDelegate?.scrollViewDidEndDragging?(scrollView, willDecelerate: decelerate)
   }
 
@@ -76,5 +88,45 @@ class PagerScrollDelegate: NSObject, UIScrollViewDelegate, UICollectionViewDeleg
   override func forwardingTarget(for aSelector: Selector!) -> Any? {
     handledSelectors.contains(aSelector) ? nil : originalDelegate
   }
+
+  // MARK: - UIGestureRecognizerDelegate
+
+  func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
+    // iOS 26+ full-screen back gesture (interactiveContentPopGestureRecognizer)
+    if #available(iOS 18.2, *) {
+      guard let collectionView = collectionView,
+            let viewController = collectionView.next as? UIViewController,
+            let navigationController = viewController.navigationController else {
+        return false
+      }
+
+      // Check if otherGestureRecognizer is the new iOS 26 interactiveContentPopGestureRecognizer
+      // NOTE: Using KVC to access private API 'interactiveContentPopGestureRecognizer' which is not
+      // yet publicly documented. The responds(to:) check ensures this won't crash if the API changes.
+      if gestureRecognizer == collectionView.panGestureRecognizer,
+         otherGestureRecognizer == navigationController.interactivePopGestureRecognizer ||
+         (navigationController.responds(to: Selector(("interactiveContentPopGestureRecognizer"))) &&
+          otherGestureRecognizer == navigationController.value(forKey: "interactiveContentPopGestureRecognizer") as? UIGestureRecognizer) {
+
+        guard let panGestureRecognizer = gestureRecognizer as? UIPanGestureRecognizer else {
+          return false
+        }
+
+        let velocity = panGestureRecognizer.velocity(in: collectionView)
+        let isLTR = layoutDirection == .ltr
+        let isBackGesture = (isLTR && velocity.x > 0) || (!isLTR && velocity.x < 0)
+
+        if currentPage == 0 && isBackGesture {
+          collectionView.panGestureRecognizer.isEnabled = false
+        } else {
+          collectionView.panGestureRecognizer.isEnabled = scrollEnabled
+        }
+
+        return true
+      }
+    }
+
+    return false
+  }
 }
 

ios/PagerView.swift

@@ -36,6 +36,13 @@ struct PagerView: View {
         scrollDelegate.delegate = delegate
         scrollDelegate.orientation = props.orientation
         collectionView.delegate = scrollDelegate
+
+        // Set up gesture recognizer delegate for iOS 26 back gesture support
+        scrollDelegate.collectionView = collectionView
+        scrollDelegate.currentPage = props.currentPage
+        scrollDelegate.layoutDirection = props.layoutDirection
+        scrollDelegate.scrollEnabled = props.scrollEnabled
+        collectionView.panGestureRecognizer.delegate = scrollDelegate
       }
     }
     .onChange(of: props.children) { newValue in
@@ -45,15 +52,20 @@ struct PagerView: View {
     }
     .onChange(of: props.currentPage) { newValue in
       delegate?.onPageSelected(position: newValue)
+      scrollDelegate.currentPage = newValue
     }
     .onChange(of: props.scrollEnabled) { newValue in
       collectionView?.isScrollEnabled = newValue
+      scrollDelegate.scrollEnabled = newValue
     }
     .onChange(of: props.overdrag) { newValue in
       collectionView?.bounces = newValue
     }
     .onChange(of: props.keyboardDismissMode) { newValue in
       collectionView?.keyboardDismissMode = newValue
     }
+    .onChange(of: props.layoutDirection) { newValue in
+      scrollDelegate.layoutDirection = newValue
+    }
   }
 }