UITableview with custom cells - swift

Question

Hi I am having a problem in my app
I am using UITableView with the custom cell. In each cell, I have a
checkbox, when I check it, it is getting the cell’s element into a
set. Everything is working correctly except a small problem.
The Problem:
2
As in the image when I click on the first row, the 10th row is seeming
like checked. The image changed to checked but in practice, it did
not occur in my set.
Here is the related part of the code
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell: TblCell = self.tableView.dequeueReusableCellWithIdentifier("cell") as! TblCell
cell.labelInCell.text = tableData[indexPath.row]//data.myFunc().myset[indexPath.row]
cell.checkBoxInCell.tag = indexPath.row
cell.checkBoxInCell.addTarget(self, action: Selector("yourCheckBoxClicked:"), forControlEvents: .TouchUpInside)
// cell.images.image = UIImage(named: tableData[indexPath.row])
// if images name is same as in tableData put it in front of label
return cell
}
func yourCheckBoxClicked(cbx:UIButton){
let picked = self.tableData[cbx.tag]
if choosenSet.contains(picked) {
choosenSet.remove(picked) // uncheck
} else {
choosenSet.insert(picked) // check
}
print(choosenSet)
}
Number of rows in section ->
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return tableData.count
}
Checkboxes class ->
class checkBox: UIButton {
//images
let checkedImage = UIImage(named: "button_checkboxFilled")
let uncheckedImage = UIImage(named: "button_checkboxEmpty")
// Bool Property
var isChecked : Bool = false {
didSet{
if isChecked == true{
self.setImage(checkedImage, forState: .Normal)
}else {
self.setImage(uncheckedImage, forState: .Normal)
}
}
}
override func awakeFromNib() {
self.addTarget(self, action: "buttonClicked:" , forControlEvents: UIControlEvents.TouchUpInside)
self.isChecked = false
}
func buttonClicked (sender:UIButton) {
if (sender == self) {
if isChecked == true {
isChecked = false
}else {
isChecked = true
}
}
}
}

Answer 1

This is because of cells reusage. You should just add this line to your func tableView(tableView:cellForRowAtIndexPath:) method:
cell.checkBoxInCell.isChecked = choosenSet.contains(tableData[indexPath.row])

Answer 2

Your cells are reused, quick solution which will work fine as your table view doesn't have a lot of cells:
let cell: TblCell = self.tableView.dequeueReusableCellWithIdentifier("cell" + String(indexPath.row)) as! TblCell
If your tableView has many rows than you should have "cell" identifier and update the selection style on each cellForRowAtIndexPath call