UILabel Text label and timer function issue on table view refresh - ios

Question

I have created a timer function in a subclass of UITableViewCell, which updates the label of itself (the label text) using a timer:
func handleCountdown(){
if timerIsRunning == false { //check if timer is NOT running, otherwise update timer
timerIsRunning = true
startTime = activity.countdownValue
runTimer()
}
}
func runTimer() {
timer = Timer.scheduledTimer(timeInterval: 0.01, target: self, selector: (#selector(self.updateTimer)), userInfo: nil, repeats: true)
}
#objc func updateTimer(){
let hours = Int(startTime) / 3600
let minutes = Int(startTime) / 60 % 60
if startTime > 0 {
startTime -= 1
print("The start time for " + String(activity.name) + "is " + String(startTime))
switch startTime {
case 0:
activity.isActive = false
activity.timerIsRunning = false
activity.countdownValue = 0
timer.invalidate()
activitiesRef = Database.database().reference().child("Users/\(userID)/Activities")
activitiesRef.child(self.activity.id).setValue([ "id": self.activity.id,
"name": self.activity.name,
"isActive": self.activity.isActive,
"locString": self.activity.locationString,
"locLat": self.activity.locLat,
"locLong": self.activity.locLong,
"privacySetting": self.activity.privacySetting,
"timerIsRunning": self.activity.timerIsRunning,
"countdownValue": self.activity.countdownValue])
returnToInactiveDelegate?.activeToInactive(data: activity)
case 1..<60: //display seconds
let count = String(Int(startTime))
countdownTimer.text = count
print("The start time for " + String(activity.name) + "is " + String(startTime))
//countdownTimer.text = String(Int(startTime)) + "s"
case 60..<3600: //display minutes
print("The start time for " + String(activity.name) + "is " + String(startTime))
countdownTimer.text = String(Int(minutes)) + "m"
case 3600..<86400: // display hours and minutes
print("The start time for " + String(activity.name) + "is " + String(startTime))
countdownTimer.text = String(Int(hours)) + "h \(minutes)m"
default:
timer.invalidate()
activity.countdownValue = 0
}
}
When the timer reaches zero, a delegate function deletes the appropriate cell and moves it to a different section in the table view, as follows:
func activeToInactive(data: Activity) {
if let i = activeActivities.index(where: { $0.isActive == false }) {
print("array index to remove: should be where it is NOT active = \(i)")
activeActivities.remove(at: i)
}
inactiveActivities.insert(data, at: 0)
self.tableView.reloadData()
}
Finally, upon table view reload, it does one last check to see if the timer is still running or not (to see if it should start the timer from the initial start time, or not do anything and let it handle the countdown) as follows:
let inactiveCell = tableView.dequeueReusableCell(withIdentifier: inactiveIdentifer , for: indexPath) as! InactiveCell
let activeCell = tableView.dequeueReusableCell(withIdentifier: activeIdentifier, for: indexPath) as! ActiveCell
if indexPath.section == 0 && self.activeActivities.count != 0 {
activeCell.name.text = self.activeActivities[indexPath.row].name
activeCell.location.text = self.activeActivities[indexPath.row].locationString
activeCell.activity = self.activeActivities[indexPath.row]
activeCell.returnToInactiveDelegate = self
if activeCell.activity.isActive == true && activeCell.timerIsRunning == false {
activeCell.activity.countdownValue = self.activeActivities[indexPath.row].countdownValue
print(String(self.activeActivities[indexPath.row].countdownValue))
activeCell.handleCountdown()
}
activeCell.countdownTimer.text = String(self.activeActivities[indexPath.row].countdownValue)
//activeCell.countdownTimer.text = self.activeActivities[indexPath.row].
return activeCell
The issue I am having is that the countdown label text is not updating, despite it showing the correct output in terminal console. My error is repeatable via this example: there are two active activities, with countdowns functioning independently of each other.
activeActivity[0] runs to zero, then is handled by case 0 in the ojbc func updateTimer, and passed through the delegate that then deletes it from active and moves it to inactive. The remaining one (what used to be activeActivity[1], is now activeActivity[0]) moves "up" in the queue and the timer continues running according to the terminal log, but the countdownLabel.text is stuck at 1s, despite the terminal showing the execution of updateTimer, with it printing the correct start time that SHOULD be displayed in the table view cell.