UIScrollView Crashing after ReloadData - ios

Question

i have ScrollView in every row of tableView. i am assigning different tag to it.
it works perfectly for the first time. when change data in array and make ReloadData App Crashes.
Error is like
fatal error: unexpectedly found nil while unwrapping an Optional value
Piece of code
cell = tableView.dequeueReusableCell(withIdentifier: "ContentCell", for: indexPath)
let lblName = (cell.viewWithTag(31)! as! UILabel)
let lblSubmited = (cell.viewWithTag(32)! as! UILabel)
let lblFrom = (cell.viewWithTag(33)! as! UILabel)
let lblTo = (cell.viewWithTag(34)! as! UILabel)
let lblTotalHours = (cell.viewWithTag(35)! as! UILabel)
let lblapprove = (cell.viewWithTag(36)! as! UILabel)
lblName.text = dict.object(forKey: "name") as? String
lblSubmited.text = dict.object(forKey: "submitted") as? String
lblFrom.text = dict.object(forKey: "from") as? String
lblTo.text = dict.object(forKey: "to") as? String
lblTotalHours.text = dict.object(forKey: "tot") as? String
lblapprove.text = "Pending"
let scrollView:UIScrollView!
if(flag.object(at: indexPath.row) as! String == "0"){
scrollView = (cell.viewWithTag(3)! as! UIScrollView)
scrollView.tag = ((100 * indexPath.row)+1)
flag.replaceObject(at: indexPath.row, with: "1")
}
else{
scrollView = (cell.viewWithTag(((100 * indexPath.row)+1))! as! UIScrollView)
}
scrollView.delegate = self
scrollView.showsHorizontalScrollIndicator = false
let viewContent = (cell.viewWithTag(1000)!)
let btApprove = UIButton(frame: CGRect(x: 704.0, y: 10.0, width: 40.0, height: 40.0))
let btReject = UIButton(frame: CGRect(x: 788.0, y: 10.0, width: 40.0, height: 40.0))
let btDetail = UIButton(frame: CGRect(x: 860.0, y: 10.0, width: 40.0, height: 40.0))
btApprove.addTarget(self, action: #selector(self.approvePressedAction), for: .touchUpInside)
btReject.addTarget(self, action: #selector(self.rejectPressedAction), for: .touchUpInside)
btDetail.addTarget(self, action: #selector(self.detailPressedAction), for: .touchUpInside)
viewContent.addSubview(btApprove)
viewContent.addSubview(btReject)
viewContent.addSubview(btDetail)
return cell
error comes in
scrollView = (cell.viewWithTag(3)! as! UIScrollView)
line and crashes after reloadData. Any Solution?

Answer 1

Seems like you are forcing a lot of optionals to un-wrap, maybe check them first before trying to use them.
I have no idea what your logic is doing, but to run some checks on the specific line that crashes try something like this.
var scrollView:UIScrollView!
if(flag.object(at: indexPath.row) as! String == "0"){
if let view = cell.viewWithTag(3) {
if let sv = view as? UIScrollView {
scrollView = sv
scrollView.tag = ((100 * indexPath.row)+1)
flag.replaceObject(at: indexPath.row, with: "1")
} else {
print("view found with tag 3 but it's not a scrollview")
}
} else {
print("no view found with tag 3")
}
} else {
scrollView = (cell.viewWithTag(((100 * indexPath.row)+1))! as! UIScrollView)
}