How to create indexpaths for all rows and all sections for uitableview?

Question

I have a table with n sections. Each section contains one row. How to create the index path for the table? There is a method that allows to create index path for all visible rows [self.tableView indexPathsForVisibleRows] I need something similar like indexPathsForAllRows

I need all this to update only the data in the table, because method [self.tableView reloadData]; updates all the table with headers and footers. That's why i have to use reloadRowsAtIndexPaths

Answer 1

This code will give you complete indices:

extension UITableView {
    func allIndexes() -> [IndexPath] {
        var allIndexes: [IndexPath] = [IndexPath]()

        let sections = self.sectionCount() ?? 0
        if sections > 1 {
            for section in 0...sections-1 {
                let rows = self.rowCount(section: section) ?? 0
                if rows > 1 {
                    for row in 0...rows-1 {
                        let index = IndexPath(row: row, section: section)
                        allIndexes.append(index)
                    }
                } else if rows == 1 {
                    let index = IndexPath(row: 0, section: section)
                    allIndexes.append(index)
                }
            }
        } else if sections == 1 {
            let rows = self.rowCount(section: 0) ?? 0
            if rows > 1 {
                for row in 0...rows-1 {
                    let index = IndexPath(row: row, section: 0)
                    allIndexes.append(index)
                }
            } else if rows == 1 {
                let index = IndexPath(row: 0, section: 0)
                allIndexes.append(index)
            }
        }
        return allIndexes
    }
}

Answer 2

Here is the solution in Swift 3

func getAllIndexPaths() -> [IndexPath] {
    var indexPaths: [IndexPath] = []

    // Assuming that tableView is your self.tableView defined somewhere
    for i in 0..<tableView.numberOfSections {
        for j in 0..<tableView.numberOfRows(inSection: i) {
            indexPaths.append(IndexPath(row: j, section: i))
        }
    }
    return indexPaths
}

Answer 3

I made a UITableView extension based on @Vakas answer. Also the sections and rows have to be checked for > 0 to prevent crashes for empty UITableViews:

extension UITableView{
    func getAllIndexes() -> [NSIndexPath] {
        var indices = [NSIndexPath]()
        let sections = self.numberOfSections
        if sections > 0{
            for s in 0...sections - 1 {
                let rows = self.numberOfRowsInSection(s)
                if rows > 0{
                    for r in 0...rows - 1{
                        let index = NSIndexPath(forRow: r, inSection: s)
                        indices.append(index)
                    }
                }
            }
        }
        return indices
    }
}

Answer 4

You don't need reload all the rows. You only need to reload the visible cells (that is why indexPathsForVisibleRows exists).

The cells that are off-screen will get their new data in cellForRowAtIndexPath: once they become visible.