Array: Swift and IOS

Question

All, Can you give me a source code of my below problem?

I have 100 user array and load that array value(username) in tableview.

Scenario:

When I click any tableviewcell, i store that value in new array( userArray) and also i have displayed right side discloser (checkmark). But my problem is when i click again to deselect that user from tablecell my app has been crashed due to index out of bound.

I know problem is out of index, but how can i resolve that issue so if i click again on that tablecell it will remove user from userArray and i get new fresh userArray?

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

let tagValue = 100 + indexPath.row
let cell: UITableViewCell = tableView.viewWithTag(tagValue) as UITableViewCell

if cell.accessoryType == UITableViewCellAccessoryType.None
{
    cell.accessoryType = UITableViewCellAccessoryType.Checkmark 
    userToSendPost.append(self.users2[indexPath.row])
} else {
    cell.accessoryType = UITableViewCellAccessoryType.None
    let tempString = userToSendPost[indexPath.row] //tagvalue
    let objcArray = userToSendPost as NSArray
    let indexOfObject = objcArray.indexOfObject(tempString)
    userToSendPost.removeAtIndex(indexPath.row)
  }
}

sorry for my bad english.

Remember to accept the answer if it solves your problem. If not leave a comment to explain why it isn't working. Thanks — Fogmeister
– Fogmeister, Commented Apr 10, 2015 at 13:03

Fogmeister · Accepted Answer · 2015-04-10 08:27:44Z

2

You are approaching this incorrectly.

On the tableview set the property tableView.allowsMultipleSelection = true.

Then when you want to get the selected users...

let selectedIndexPaths = tableView.indexPathsForSelectedRows()

Then you can use the row property from those index paths to find the users.

var selectedUsers: [User] = []

for indexPath in selectedIndexPaths {
    let user = theUsers[indexPath.row]

    selectedUsers.append(user)
}

The multiple selection and the check mark is handled automatically by the tableview.

answered Apr 10, 2015 at 8:27

Fogmeister

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Comments

Kevin Machado · Accepted Answer · 2015-04-10 08:34:29Z

To follow your approach, I think this could help you ;)

But the approach of @Fogmeister is better !

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

        let tagValue = 100 + indexPath.row
        let cell: UITableViewCell = tableView.viewWithTag(tagValue) as UITableViewCell

        if cell.accessoryType == UITableViewCellAccessoryType.None
        {
            cell.accessoryType = UITableViewCellAccessoryType.Checkmark
            userToSendPost.append(self.users2[indexPath.row])
        } else {
            let tempUserString = self.users2[indexPath.row] // get your user string
            if contains(userToSendPost, tempString) { // check if exist on your array
                userToSendPost.removeObject(tempString) // remove it
            }
            cell.accessoryType = UITableViewCellAccessoryType.None
        }
}


// If you want to use Array, add this method
extension Array {
        mutating func removeObject<U: Equatable>(object: U) {
            var index: Int?
            for (idx, objectToCompare) in enumerate(self) {
                if let to = objectToCompare as? U {
                    if object == to {
                        index = idx
                    }
                }
            }

            if(index != nil) {
                self.removeAtIndex(index!)
            }
        }
}

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