Get [NSIndexPath] array for rows in section of UITableView in Swift

Question

I've got a section of rows in a tableView (section 1) and I need to initialize an [NSIndexPath] array for all rows in that section.

I know I can count the number of rows in the section easily enough:

let rowsInSection = tableView.numberOfRowsInSection(1)

But that only gets me the row count, not the index paths.

What's the cleanest, most "Swift-like" way of retrieving the index paths?

An example of what I'm looking for:

func indexPathsForRowsInSection(section: Int) -> [NSIndexPath] {
    // magic happens here
    return indexPathsForRowsInSection
}

you can use for to loop the count of row, then declare indexPath directly like let index = NSIndexPath(forItem: i, inSection: 0). i will be your item row — Lee
– Lee, Commented Mar 4, 2016 at 3:43

matt · Accepted Answer · 2017-01-17 22:49:33Z

11

Like this in Swift 3:

func indexPathsForRowsInSection(_ section: Int, numberOfRows: Int) -> [NSIndexPath] {
    return (0..<numberOfRows).map{NSIndexPath(row: $0, section: section)}
}

edited Jan 17, 2017 at 22:49

answered Mar 4, 2016 at 3:58

matt

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4 Comments

smat88dd Over a year ago

Great, nice solution!

brandonscript Over a year ago

Updated for Swift 3

matt Over a year ago

@brandonscript Note my modification of your update: I'd remove the section label from the first parameter so as not have to call this by saying ...Section(section....

brandonscript Over a year ago

Ah yes absolutely.

Vincent Bernier · Accepted Answer · 2016-03-04 03:57:27Z

4

I don't know why you want this, but you could do as follow:

let paths = (0..<tableView.numberOfRowsInSection(section)).map { NSIndexPath(forRow: $0, inSection: section) }
return paths

answered Mar 4, 2016 at 3:57

Vincent Bernier

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Comments

brandonscript · Accepted Answer · 2017-01-17 23:26:35Z

0

Here's a concise Swift 3 extension for UITableView based on Vincent and Matt's answers:

extension UITableView {
    func indexPathsForRowsInSection(_ section: Int) -> [NSIndexPath] {
        return (0..<self.numberOfRows(inSection: section)).map { NSIndexPath(row: $0, section: section) }
    }
}

// usage
tableView.indexPathsForRowsInSection(aNumber)

answered Jan 17, 2017 at 23:26

brandonscript

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Comments

Pavan Sisode · Accepted Answer · 2017-04-15 08:31:04Z

0

 let section = 1
 let numberOfRows = 15

 let indexPaths = (0..<numberOfRows).map { i in return 
                                          IndexPath(item:i, section: section)  
                                         }

answered Apr 15, 2017 at 8:31

Pavan Sisode

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