UIViews accessed on background thread for hit testing when SDLTouchManager calls SDLTouchManagerDelegate methods

[Lievesley]

Bug Report

UIViews are accessed on a background thread while hit testing when SDLTouchManager calls SDLTouchManagerDelegate methods.

Reproduction Steps

1. Enable main thread checker.
2. Run build in debugger and use touch events with hit testing.
3. SDLTouchManager calls [SDLFocusableItemLocator viewForPoint] which accesses UIViews on background thread.

Expected Behavior

UIViews should only be accessed on main thread.
The SDLTouchManager should also not call SDLTouchManagerDelegate methods on a background thread since it sends UIViews which may lead the callee to try to use the UIView on the background thread.

Observed Behavior

UIViews accessed on background thread.

OS & Version Information

• iOS Version: 11.0.3
• SDL iOS Version: 5.1.1

[NicoleYarroch]

Pull Request #833 was created to fix this bug