fix(ios): preserve scroll position when nested sheet is dismissed (#468)

Author: lucasklaassen

CHANGELOG.md

@@ -9,6 +9,7 @@
 
 ### 🐛 Bug fixes
 
+- **iOS**: Fixed scroll position jumping when nested sheet is dismissed with inverted FlatList. ([#468](https://github.com/lodev09/react-native-true-sheet/pull/468) by [@lucasklaassen](https://github.com/lucasklaassen))
 - **Android**: Fixed present promise not resolving on resize. ([c3495500](https://github.com/lodev09/react-native-true-sheet/commit/c3495500) by [@lodev09](https://github.com/lodev09))
 - **iOS**: Fixed scroll view pinning to respect content view padding/margin. ([#429](https://github.com/lodev09/react-native-true-sheet/pull/429), [#446](https://github.com/lodev09/react-native-true-sheet/pull/446) by [@lodev09](https://github.com/lodev09))
 - **iOS**: Fixed footer not translating back when keyboard hides via ScrollView. ([#424](https://github.com/lodev09/react-native-true-sheet/pull/424) by [@lodev09](https://github.com/lodev09))

ios/TrueSheetContentView.mm

@@ -138,9 +138,15 @@ - (void)updateScrollViewHeight {
   CGFloat newHeight = containerView.bounds.size.height - scrollViewFrameInContainer.origin.y;
 
   if (newHeight > 0) {
+    // Preserve contentOffset before changing frame to prevent scroll jump
+    CGPoint savedContentOffset = _pinnedScrollView.scrollView.contentOffset;
+
     CGRect frame = _pinnedScrollView.frame;
     frame.size.height = newHeight;
     _pinnedScrollView.frame = frame;
+
+    // Restore contentOffset after frame change
+    _pinnedScrollView.scrollView.contentOffset = savedContentOffset;
   }
 }