Multiple Timers in a UITableViewCell (Swift)

Question

I have ones UITableViewcellsthat are created at different points in time, and I would like each of them to have an independent timer that starts when an object is added usingreloadData()

This is what I have done so far.

import UIKit

var timer = Timer()
var blinkStatus:Bool! = false
var time = 300


class LiveViewCell: UITableViewCell {

    let str = String(format:"%02d:%02d", (time / 60), (time % 100))
    func processTimer() {

        if time > 0 {
            time -= 1
            timeRemainingLbl.text = String(time)
        } else if time == 0 {
            timer.invalidate()
            timeRemainingLbl.text = "Due!"
            timer = Timer.scheduledTimer(timeInterval: 0.5, target: self, selector: #selector(LiveViewCell.blinkTimer), userInfo: nil, repeats: true)

        }

    }

    func blinkTimer() {
        if blinkStatus == false {
            timeRemainingLbl.textColor = UIColor(red:1.00, green:0.00, blue:0.00, alpha:1.0)
            blinkStatus = true
        } else if blinkStatus == true {
            timeRemainingLbl.textColor = UIColor.clear
            blinkStatus = false
        }

    }


    @IBOutlet weak var tableNumberLeftLabel: UILabel!
    @IBOutlet weak var guestNumbersLabel: UILabel!

    @IBOutlet weak var timeInTableLabel: UILabel!
    @IBOutlet weak var tableNumberLbl: UILabel!
    @IBOutlet weak var timeRemainingLbl: UILabel!


    var table: Table!


    func configureLiveCell(_ NT: Table) {

        layer.cornerRadius = 20
        timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(LiveViewCell.processTimer), userInfo: nil, repeats: true)
        tableNumberLbl.text = "T" + String(NT.number)
        timeRemainingLbl.text = String(time)

    }
}

The problem occurs when it configureLiveCellis called whenever I create a new cell. It seems that the timer is speeding up, and I would like each timer to be independent.

Answer 1

Override the method prepareForReuse.

override func prepareForReuse() {
    super.prepareForReuse()

    timer.invalidate()
}

. , configureLiveCell .

BTW - deinit .

timer nil . , , , .

, , timer, time blinkStatus, , .