CODEWITHSUNDEEP
iosswiftuitableviewrowindexpath
user7219266
user7219266

Reputation:

Swift - How to do specific action on last row of a UITableView when the last row isn't visible?

I am trying to achieve a custom action on the last row of my UITableView.

I found a nice extension in order to know if I'm on the last row :

extension UITableView {

    func isLast(for indexPath: IndexPath) -> Bool {

        let indexOfLastSection = numberOfSections > 0 ? numberOfSections - 1 : 0
        let indexOfLastRowInLastSection = numberOfRows(inSection: indexOfLastSection) - 1

        return indexPath.section == indexOfLastSection && indexPath.row == indexOfLastRowInLastSection
    }
}

The only issue I'm facing is that if my tableView has many rows, with scrollable content, the last row isn't visible. Thus, in my cellForRow I am doing this :

if tableView.isLast(for: indexPath) {
   print("Last Row - Do Specific action")
} else {
}

It is working, except that imagine my screen can display 6 rows, but the total number of rows of my tableView is 15. It will apply my specific action on the row at indexPath 5 and 15.

I am guessing it is because each time cellForRow is called, it is checking for the last row, and it apply on the last visible row also.

How can I achieve a custom action ONLY on the last row even if it is not visible yet?

EDIT: After more investigation, the issue comes from UITableView not able to prefetch the cell, and cellLoaded and cellVisible is the same.

Upvotes: 1

Views: 8615

Answers (3)

Apogee
Apogee

Reputation: 719

I can't copy paste the code as I don't have xcode right now.

But if you want to perform action before cell gets displayed then do it in

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath)

And to check for the last row:

if indexPath.row == dataSourceArray.count - 1 {
   //Perform action
}

dataSourceArray is the array from which you are fetching the data to show it in the cell.

Basically your code should be something like this

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
       if indexPath.row == dataSourceArray.count - 1 {
            //Perform action
    }
}

You may go through apple docs to know more about tableview delegate methods

Upvotes: 6

Amul4608
Amul4608

Reputation: 1448

try this code in cell for row method

if indexPath.row == yourarray.count - 1{

                // Put your code

        }

Upvotes: 0

Антония Чекръкчиева
Антония Чекръкчиева

Reputation: 55

You can try with tableview delegate method:

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath)

Upvotes: 0

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