在tableview重新加载时未调用viewForHeaderInSection

Question

I have 2 view controllers A and B, view for viewForHeaderInSection is loading properly first time, I have a segue to connect to View B, when I click Back button on navigation bar from view B, View A loads, but if I click on section header its crashing. upon debugging I noticed, viewForHeaderInSection is not called on reload.

I added self.tableView.delegate = self to onViewDidLoad() function, it doesn't seem to work, I have heightForHeaderInSection properly defined.

Why it is not being called on reload only? help please.

Answer 1

This method only works correctly when tableView(_:heightForHeaderInSection:) is also implemented. (From documentation)

Answer 2

Use viewDidAppear to reload what's necessary instead, cause if you hit back, the view is presented from heap memory.

Hope it helps