UI table view cell check marks repeating swift - uitableview

Question

My when a table cell is checked and you scroll down a check mark is repeated.
I know this is due to cell reuse, but don't know how to fix it.
function to populate table
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let item = self.myEvents[indexPath.row]
let cell = tableView.dequeueReusableCellWithIdentifier("row", forIndexPath: indexPath) as! UITableViewCell
cell.textLabel!.text = self.myEvents[indexPath.row]
return cell
}
//function to make the table checkable
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
println("indexpath: \(indexPath)")
let cell: UITableViewCell = tableView.cellForRowAtIndexPath(indexPath)!
let text = cell.textLabel!.text
if cell.accessoryType == UITableViewCellAccessoryType.None {
cell.accessoryType = UITableViewCellAccessoryType.Checkmark
//let text = cell.textLabel!.text
if(checkedEvents[0] == ""){
checkedEvents[0] = text!
}else{
checkedEvents.append(text!)
}
} else {
cell.accessoryType = UITableViewCellAccessoryType.None
var index = 0
for event in checkedEvents{
if event == text{
self.checkedEvents.removeAtIndex(index)
index++
}
}
}
tableView.deselectRowAtIndexPath(indexPath, animated: true)
}

Answer 1

First, you need to store the number of the selected row somewhere. How about self.selectedRowNumber?
var selectedRowNumber: Int? = nil
Set this when the user selects a row (short version):
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let cell: UITableViewCell = tableView.cellForRowAtIndexPath(indexPath)!
cell.accessoryType = .Checkmark
self.selectedRowNumber = indexPath.row
// You'll also need some code here to loop through all the other visible cells and remove the checkmark from any cells that aren't this one.
}
Now modify your -tableView:cellForRowAtIndexPath: method to clear the accessory if it's not the selected row, or add it if it is:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("row", forIndexPath: indexPath) as! UITableViewCell
cell.textLabel!.text = self.myEvents[indexPath.row]
cell.accessoryType = .None
if let selectedRowNumber = self.selectedRowNumber {
if indexPath.row == selectedRowNumber {
cell.accessoryType = .Checkmark
}
}
return cell
}
This code was written here in the browser, and may need some fixes to compile.

Answer 2

If you want only one selection, put tableView.reloadData() in your didSelectRowAtIndexPath function