Tap on section does nothing at all

[kamenr]

Hi, I have successfully display the sections and child cells correctly based on your example. But when I tap on the section header the cell is not expand or collapse, I follow all the guide on the example but I still failed, any idea what I miss out or what? Thanks

[iofluxdev1]

Same issue. Tried iOS 12 and 13 simulators.

Edit: After a few days of battling with this and almost giving up, I deleted the view controller in the storyboard and created it again, which seems to have resolved the issue. It is now working as intended.