CODEWITHSUNDEEP
iosswiftuitableviewuiscrollviewindexpath
LF-DevJourney
LF-DevJourney

Reputation: 28529

Get all indexPaths in a section

I need to reload the section excluding the header after I do some sort on my tableview data. That's to say I just want to reload all the rows in the section. But I don't find a easy way to make it after I search for a while.

reloadSections(sectionIndex, with: .none) not works here, for it will reload the whole section including the header, footer and all the rows.

So I need to use reloadRows(at: [IndexPath], with: UITableViewRowAnimation) instead. But how to get the whole indexPaths for the all the rows in the section.

Upvotes: 4

Views: 9147

Answers (5)

Ashley Mills
Ashley Mills

Reputation: 53101

You can get the indexPaths for reloading like this…

let indexPaths = tableView.visibleCells
    .compactMap(tableView.indexPath)
    .filter { $0.section == SECTION }

There's no need to reload non-visible cells, as they will be updated when cellForRow(at indexPath:) is called

Upvotes: 7

Daniel Ford
Daniel Ford

Reputation: 59

You can get all the visible index paths directly, and then filter them however you want, i.e.

func reloadRowsIn(section: Int, with animation: UITableView.RowAnimation) {
    if let indexPathsToReload = indexPathsForVisibleRows?.filter({ $0.section == section }) {
        reloadRows(at: indexPathsToReload, with: animation)
    }
}

Upvotes: -1

PPL
PPL

Reputation: 6555

You can use below function get IndexPath array in a given section.

func getAllIndexPathsInSection(section : Int) -> [IndexPath] {
    let count = tblList.numberOfRows(inSection: section);        
    return (0..<count).map { IndexPath(row: $0, section: section) }
}

Or 

func getAllIndexPathsInSection(section : Int) -> [IndexPath] {
    return tblList.visibleCells.map({tblList.indexPath(for: $0)}).filter({($0?.section)! == section}) as! [IndexPath]
}

Upvotes: 12

trungduc
trungduc

Reputation: 12144

In my opinion, you don't need reload whole cells in the section. Simply, reload cells which is visible and inside section you need to reload. Reload invisible cells is useless because they will be fixed when tableView(_:cellForRowAt:) is called.

Try my below code

var indexPathsNeedToReload = [IndexPath]()

for cell in tableView.visibleCells {
  let indexPath: IndexPath = tableView.indexPath(for: cell)!

  if indexPath.section == SECTION_INDEX_NEED_TO_RELOAD {
    indexPathsNeedToReload.append(indexPath)
  }
}

tableView.reloadRows(at: indexPathsNeedToReload, with: .none)

Upvotes: 7

davidethell
davidethell

Reputation: 12018

Iterate over the index paths in a section using the numberOfRows inSection method of UITableView. Then you can build your IndexPath array:

var reloadPaths = [IndexPath]()
(0..<tableView.numberOfRows(inSection: sectionIndex)).indices.forEach { rowIndex in
    let indexPath = IndexPath(row: rowIndex, section: sectionIndex)
    reloadPaths.append(indexPath)
}
tableView.reloadRows(at: reloadPaths, with: UITableViewRowAnimation)

Upvotes: 1

Related Questions