How to Use Table View Cell Outside Table View Function - swift

Question

i need to change my image in cell using view will appear. But i can't use my cell in view will appear here what i've done
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(true)
let cell: HomeCellTableViewCell = self.tableCity.dequeueReusableCell(withIdentifier: "Cell") as! HomeCellTableViewCell
if session == nil {
print("first")
cell.iconForDownload.setImage(UIImage(named: "ic_download"), for: .normal)
} else {
print("second")
cell.iconForDownload.setImage(UIImage(named: "ic_next_green"), for: .normal)
}
}
it print "first" but the image still didn't change
in my cellForRowAt :
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: HomeCellTableViewCell = self.tableCity.dequeueReusableCell(withIdentifier: "Cell") as! HomeCellTableViewCell
let city = listData[indexPath.row]
cell.labelNameCity.text = city.region
cell.labelNameCityJpn.text = city.regionJpn
let stringImage = config.BASE_URL+city.imgArea
let url = URL(string: stringImage.replacingOccurrences(of: " ", with: "%20"))
urlDownload = config.BASE_URL+kota.urlDownload
urlDownloadFinal = URL(string: urlDownload.replacingOccurrences(of: " ", with: "%20"))
if session == nil {
cell.imageCity.kf.setImage(with: url)
cell.iconForDownload.setImage(UIImage(named: "ic_download"), for: .normal)
} else {
cell.imageCity.kf.setImage(with: url)
cell.iconForDownload.setImage(UIImage(named: "ic_next_green"), for: .normal)
}
return cell
}

Answer 1

You need to use cellForRow(at:) to get the cell it will return optional UITableViewCell so use if let or guard let to wrapped the optional.
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(true)
let indexPath = IndexPath(row: 0, section: 0) //Set your row and section
if let cell = tableView.cellForRow(at: indexPath) as? HomeCellTableViewCell {
//access cell
}
}
Note: The batter approach is to set your datasource array and simply reload the affected table rows using reloadRows(at:with:).
let indexPath = IndexPath(row: 0, section: 0) //Set your row and section
self.tableView.reloadRows(at: [indexPath], with: .automatic)