Downcast from Any to Specific type - ios

Question

I have firestore DB "sales", which has one column called saleapproveddate. There are 2 levels of people, one who logs sale and other approves the sale logs. While logging sale, I save the saleapproveddate as NSNull() (which saves as nil in firestore DB field). Approver can update the saleapproveddate as TimeStamp, but if the approver never approves the sale log, it remains as nil in firestore DB field. So it can have either nil or TimeStamp type.
I have model Sales
class Sale {
var saleapprovedate : Any?
}
When I load the data from firestore, I tried to downcast the saleapprovedate as Any
let approvedDate = document[SaleProperties.paidDate.rawValue] as Any
But the real challenge is, saleapprovedate can have either nil or Timestamp. How do I check for type condition, convert to specific type and display in label?
Below is what I tried:
While loading data:
sale.saleapprovedate = document[SaleProperties.saleapprovedate.rawValue] as Any
while displaying data:
let saleItem = sales[indexPath.row]
let paidDate = saleItem.saleapprovedate
if paidDate == nil {
cell.paidDateLabelContainer.text = "Yet to pay"
cell.paidStatusImageView.isHidden = true
}
else {
let paidDateTimeStamp = saleItem.saleapprovedate as! Timestamp
let convertedPaidDate = self.convertTimestampToDate(timeStamp: paidDateTimeStamp)
cell.paidDateLabelContainer.text = convertDateToString(date: convertedPaidDate)
cell.paidStatusImageView.isHidden = false
}
But the above code is not updating the cell label properly. I have two data, one has saleapprovedate as Timestamp and other as nil. Both the cell label is displaying as "Yet to pay". What is wrong?

Answer 1

Modal :
var incentivepaiddate : Any?
Array :
var sales : [Sale] = [Sale]()
Loading data from firestore :
for document in querySnapshot!.documents {
let sale = Sale()
sale.incentivepaiddate = document[SaleProperties.incentivepaiddate.rawValue]
self.sales.append(sale)
}
Checking for nil, downcasting to a specific type and display data in cell
let saleItem = sales[indexPath.row]
let paidDate = saleItem.incentivepaiddate
if let paid = paidDate {
let paidDateTimeStamp = paid as? Timestamp
let convertedPaidDate = self.convertTimestampToDate(timeStamp: paidDateTimeStamp!)
cell.paidDateLabelContainer.text = convertDateToString(date: convertedPaidDate)
}
else {
cell.paidDateLabelContainer.text = "Yet to pay"
cell.paidStatusImageView.isHidden = true
}
Hope this helps someone!