| Flutter iOS Embedder |

FlutterScrollableSemanticsObject(CoordinateSpace) Category Reference

## Detailed Description

Scrollable containers interact with the iOS focus engine using the `UIFocusItemScrollableContainer` protocol. The said protocol (and other focus-related protocols) does not provide means to inform the focus system of layout changes. In order for the focus highlight to update properly as the scroll view scrolls, this implementation incorporates a UIScrollView into the focus hierarchy to workaround the highlight update problem.

As a result, in the current implementation only scrollable containers and the root node establish their own `coordinateSpace`s. All other `UIFocusItemContainter`s use the same `coordinateSpace` as the containing UIScrollView, or the root `FlutterView`, whichever is closer.

See also the `frame` method implementation.

Definition at line 181 of file SemanticsObject+UIFocusSystem.mm.

The documentation for this category was generated from the following file:

- shell/platform/darwin/ios/framework/Source/SemanticsObject+UIFocusSystem.mm