Timer

Sometimes we need to manage multiple timers in UICollectionView 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 Cell, and also manage every refresh cell in UICollectionView.

for manage recreating or refreshing cell we need to follow some steps:

1: Create a dictionary of timers:

var timerLatestProduct = [Int:Timer]()

var timerCount:NSMutableArray = [100,100,100,100,100,100,100,100,100]

2: Now its time to add the timer in cell’s label.

here I have taken an array of value which contains a value.

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
// register your cell and set
cell.textLabel.text = "some value"
cell.textlabel.tag = indexpath.row
if timer[indexPath.row] == nil{
print("fisrt")
timer[indexPath.row] = (Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(self.runScheduledTask), userInfo: details, repeats: true))
}else{
print("second")
let t:Timer = timer[indexPath.row]!
t.invalidate()
timer[indexPath.row] = (Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(self.runScheduledTask), userInfo: details, repeats: true))
}
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

// register your cell and set

cell.textLabel.text = "some value"

cell.textlabel.tag = indexpath.row

if timer[indexPath.row] == nil{

print("fisrt")

timer[indexPath.row] = (Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(self.runScheduledTask), userInfo: details, repeats: true))

}else{

print("second")

let t:Timer = timer[indexPath.row]!

t.invalidate()

timer[indexPath.row] = (Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(self.runScheduledTask), userInfo: details, repeats: true))

}

Here we are checking whether the timer is created or not and if we scroll the cell then “cellForItemAt” is called then we are re-creating the timer object by invalidating the previous one .

Note:

Here userinfo: we are sending the cell label or you can send cell also

Now its time to define the timer class:

func runScheduledTask(_ runningTimer: Timer) {
var dict = runningTimer.userInfo as! [String:UILabel];
if let label:UILabel = (dict["cell"]) {
label.text = ""
var remainingSeconds:Double = timerCount.getTimer[label.tag].time
remainingSeconds -= 1
if remainingSeconds == 0 || remainingSeconds < 0{
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()
timerCount[label.tag] =remainingSeconds

}
}
}

func runScheduledTask(_ runningTimer: Timer) {

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

if let label:UILabel = (dict["cell"]) {

label.text = ""

var remainingSeconds:Double = timerCount.getTimer[label.tag].time

remainingSeconds -= 1

if remainingSeconds == 0 || remainingSeconds < 0{

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()

timerCount[label.tag] =remainingSeconds

}

Now we are handling the array of timer separately for every timer object.

kunal prasad 26 October 2021

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Manage Multiple Timer in Swift using in CollectionView

Timer

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Manage Multiple Timer in Swift using in CollectionView

Timer

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