UIButton in CollectionViewCell "IndexPath doesn't work" - swift

Question

I made a simple app add uibutton to collectionviewcell but when i give action an error occurs. Here is a screenshoot.
Error 1
Error 2
and my code of class: UIbuton {}
import Foundation
import UIKit
class KeypadUIButton: UIButton {
var qIndex : NSIndexPath?
}
and my cell class is :
import UIKit
class ConverterCollectionViewCell: UICollectionViewCell {
#IBOutlet weak var keypadButton: KeypadUIButton!
}
and error in :
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = padCollectionView.dequeueReusableCell(withReuseIdentifier: identifier, for: indexPath) as! ConverterCollectionViewCell
let index = indexPath.row
// -> cell.keypadButton.qIndex = indexPath as NSIndexPath
return cell
}
Where is my mistake. can you help me ?

Answer 1

Oh! I've got your error, it seems you missed this:
Type in your class name: KeypadUIButton
Also you don't need to use NSIndexPath in swift. Just use IndexPath instead. So you won't need to down cast it.

Answer 2

I have try with your code its work fine , please check that you give action to your button as well as custom class name to your button
class KeypadUIButton: UIButton {
var qIndex : NSIndexPath?
}
class ConverterCollectionViewCell: UICollectionViewCell {
#IBOutlet weak var keypadButton: KeypadUIButton!
}
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from
a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
extension ViewController : UICollectionViewDataSource{
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 16
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let identifier : String = "test"
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: identifier, for: indexPath) as! ConverterCollectionViewCell
cell.keypadButton.qIndex = indexPath as NSIndexPath?
cell.keypadButton.setTitle("\(indexPath.row + 1)", for: .normal)
return cell
}
}

Answer 3

You had taken
qIndex as? NSIndexPath
you can take as
qIndex as? Indexpath
It avoid unnecessary downcasting in cellforitem.