How to get a UITableView's visible sections?

Question

UITableView provides the methods indexPathsForVisibleRows and visibleCells, but how can I get the visible sections?

Answer 1

Or the really easy way would be to take advantage of valueForKeyPath and the NSSet class:

NSSet *visibleSections = [NSSet setWithArray:[[self.tableView indexPathsForVisibleRows] valueForKey:@"section"]];

Basically you get an array of the section values in the visible rows and then populate a set with this to remove duplicates.

Answer 2

Swift version

if let visibleRows = tableView.indexPathsForVisibleRows {
    let visibleSections = visibleRows.map({$0.section})
}