How to store an Array of selected rows?

Question

In my code I have a table view that loads the name of users using my app. When a user selects a row it will appear a checkmark. What I want to do is save an array that contains all the selected rows (the array will contain the names). I found some information, but I still learning iOS programming and I dont know Obj-c.

This is what I have done so far:

var selectedMembers = [String]?
 func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.names?.count ?? 0
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("UserCell") as! UITableViewCell

        cell.textLabel!.text = names![indexPath.row]

        return cell
    }


func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
{
    selectedMembers = Array()
    if let cell = tableView.cellForRowAtIndexPath(indexPath) {

        if cell.accessoryType == .Checkmark
        {
            cell.accessoryType = .None

            self.selectedMembers?.remove(indexPath)

        }
        else
    {
        cell.accessoryType = .Checkmark
        self.selectedMembers?.append(indexPath)
        }
    }
}

possible duplicate of [Swift - Write an Array to a Text File](http://stackoverflow.com/questions/24977139/swift-write-an-array-to-a-text-file) — Dennis Weidmann, Aug 25 '15 at 19:14
Just check this Question, is about how to save an Swift Array to a file http://stackoverflow.com/questions/24977139/swift-write-an-array-to-a-text-file — Dennis Weidmann, Aug 25 '15 at 19:14
Is your question how to save the array for later use or how to get the names of the selected members (The string from the row) — milo526, Aug 25 '15 at 19:14
@milo526 I will use these names (saved in the array) to create a group. — Fernando Resende, Aug 25 '15 at 19:18

score 2 · Answer 1 · answered Aug 25 '15 at 19:20

2

To get the names you will need to use the selected row and get the entry of that row into your array with names.

To get the row of a indexpath you can use

indexPath.row

To get the name of your member you would use

names![indexPath.row-1]

Ofcourse you would save this to your array using

self.selectedMembers?.append(names![indexPath.row-1])

to remove the item you will need to add an extra step

self.selectedMembers?.removeAtIndex(selectedMembers.indexOf(names![indexPath.row-1]))

answered Aug 25 '15 at 19:20

milo526

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Using this solution I got the message: "fatal error: Array index out of range." I deleted the "-1" and I got in my array just the name of the last member selected. – Fernando Resende Aug 25 '15 at 19:37
Could you please specify as to what line returned the error? – milo526 Aug 25 '15 at 19:38
This line: self.selectedMembers?.append(names![indexPath.row-1]). The app crashes when I select the row. – Fernando Resende Aug 25 '15 at 19:44
In your interface builder did you enable the possibility to select multiple rows (Do you see multiple checkmarks) – milo526 Aug 25 '15 at 19:46
Yes, the checkmaks appears in all selected users. – Fernando Resende Aug 25 '15 at 20:09
But at any given moment there is only 1 entry in your selectedMembers array? – milo526 Aug 25 '15 at 20:09
When I deleted the "-1" I could select the names without crash the app. I did a print of selectedMembers and shows only the last name(row) that I selected on my table. – Fernando Resende Aug 25 '15 at 20:26

jherg · Answer 2 · 2015-08-25T19:47:19.343

0

You can use the didSelectRowAtIndexPath and didDeselectRowAtIndexPath delegate methods like so to keep track of the index paths in the table.

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    selectedIndexPaths.append(indexPath)

}

func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) {

    if let index = find(selectedIndexPaths, indexPath) {
        selectedIndexPaths.removeAtIndex(index)
    }

}

Then you can backtrack and get the selected objects using the index paths.

edited Aug 25 '15 at 19:47

answered Aug 25 '15 at 19:26

jherg

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It gives me the message: "Cannot Invoke "append" with an argument list of type '(NSIndexPath)'." at the line selectedMembers.append(indexPath) – Fernando Resende Aug 25 '15 at 19:52
Make sure you intialize it like this `var selectedIndexPaths = [NSIndexPath]()` – jherg Aug 25 '15 at 19:59
hey what's find(selectedIndexPaths,indexPath)? m getting error use of unresolve identifier 'find'. – deltami Sep 09 '17 at 05:55

How to store an Array of selected rows?

2 Answers2