Timer

Sometimes we need to manage multiple timers in UIView so if we recreate multiple timers then it will show wrong value so for this we need to create a single Timer class for every single UIView, for doing this we need to follow some steps:

1: Create an array of timers:

var timer = [Timer]()

2: Now in for loop where you creating multiple views here you have to append the timer and also the UILabel on which the value will show :

if ((data.object(forKey: "mainDeal") as? NSArray)?.count)! > 0{

let dealofDayTime = UILabel(frame: CGRect(x: 10, y: Y, width: categoryBlock.frame.size.width - 20, height: 30))
                    dealofDayTime.textColor = UIColor.white
                    dealofDayTime.tag = i
                    dealofDayTime.textAlignment = .left
                    dealofDayTime.font = UIFont(name: BOLDFONT, size: 14)
                    dealofDayTime.text = formattedString
                    categoryBlock.addSubview(dealofDayTime);



var details = [String:AnyObject]();
                    details = ["label":dealofDayTime];
                    
                    self.timer.append(Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(self.runScheduledTask), userInfo: details, repeats: true))

}

if ((data.object(forKey: "mainDeal") as? NSArray)?.count)! > 0{

let dealofDayTime = UILabel(frame: CGRect(x: 10, y: Y, width: categoryBlock.frame.size.width - 20, height: 30))

dealofDayTime.textColor = UIColor.white

dealofDayTime.tag = i

dealofDayTime.textAlignment = .left

dealofDayTime.font = UIFont(name: BOLDFONT, size: 14)

dealofDayTime.text = formattedString

categoryBlock.addSubview(dealofDayTime);

var details = [String:AnyObject]();

details = ["label":dealofDayTime];

self.timer.append(Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(self.runScheduledTask), userInfo: details, repeats: true))

}

3: Now define the function:

func runScheduledTask(_ runningTimer: Timer) {
        
        var dict = runningTimer.userInfo as! [String:AnyObject];
        let label:UILabel = dict["label"] as! UILabel
    
        var remainingSeconds = dealOfTheDay.object(at: label.tag) as! Double;
        remainingSeconds -= 1
       
        
        if remainingSeconds == 0  || remainingSeconds < 0{
            runningTimer.invalidate()
            label.text = ""
        }
        else{
            let formatter = DateComponentsFormatter()
            formatter.allowedUnits = [.day,.hour, .minute, .second]
            formatter.unitsStyle = .positional
            let formattedString = formatter.string(from: TimeInterval(remainingSeconds))!
            label.text = formattedString.uppercased()
            dealOfTheDay.replaceObject(at: label.tag, with: remainingSeconds)
            
        }
   
    }

func runScheduledTask(_ runningTimer: Timer) {

var dict = runningTimer.userInfo as! [String:AnyObject];

let label:UILabel = dict["label"] as! UILabel

var remainingSeconds = dealOfTheDay.object(at: label.tag) as! Double;

remainingSeconds -= 1

if remainingSeconds == 0 || remainingSeconds < 0{

runningTimer.invalidate()

label.text = ""

}

else{

let formatter = DateComponentsFormatter()

formatter.allowedUnits = [.day,.hour, .minute, .second]

formatter.unitsStyle = .positional

let formattedString = formatter.string(from: TimeInterval(remainingSeconds))!

label.text = formattedString.uppercased()

dealOfTheDay.replaceObject(at: label.tag, with: remainingSeconds)

}

Note:

here “dealOfTheDay” is an array of interval time:

“dealOfTheDay” = [100,200,145….] so on

4: for reinitializing you need to do like that

for i in 0..<self.timer.count{
            let t:Timer = timer[i];
            t.invalidate()
        }
        self.timer = [Timer]()

for i in 0..<self.timer.count{

let t:Timer = timer[i];

t.invalidate()

}

self.timer = [Timer]()

That’s All
For any queries, feel free to ask.

kunal prasad

17 Nov, 2023
Updated by - anchit
26 Oct, 2021
Updated by - Kushal Varshney

. . .

Manage Multiple Timer in Swift using UIView

Timer

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Manage Multiple Timer in Swift using UIView

Timer

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