How to get the indexpath.row when an element is activated?

Question

I have a tableview with buttons and I want to use the indexpath.row when one of them is tapped. This is what I currently have, but it always is 0

var point =         


        

Answer 1

USING A SINGLE TAG FOR ROWS AND SECTIONS

There is a simple way to use tags for transmitting the row/item AND the section of a TableView/CollectionView at the same time.

Encode the IndexPath for your UIView.tag in cellForRowAtIndexPath :

buttonForCell.tag = convertIndexPathToTag(with: indexPath)

Decode the IndexPath from your sender in your target selector:

    @IBAction func touchUpInsideButton(sender: UIButton, forEvent event: UIEvent) {

        var indexPathForButton = convertTagToIndexPath(from: sender)

    }

Encoder and Decoder:

func convertIndexPathToTag(indexPath: IndexPath) -> Int {
    var tag: Int = indexPath.row + (1_000_000 * indexPath.section)
    
    return tag
}

func convertTagToIndexPath(from sender: UIButton) -> IndexPath {
    var section: Int = Int((Float(sender.tag) / 1_000_000).rounded(.down))
    var row: Int = sender.tag - (1_000_000 * section)

    return IndexPath(row: row, section: section)
}

Provided that you don’t need more than 4294967296 rows/items on a 32bit device ;-) e.g.

• 42949 sections with 100_000 items/rows
• 4294 sections with 1_000_000 items/rows - (like in the example above)
• 429 sections with 10_000_000 items/rows

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WARNING: Keep in mind that when deleting or inserting rows/items in your TableView/CollectionView you have to reload all rows/items after your insertion/deletion point in order to keep the tag numbers of your buttons in sync with your model.

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