How to update a dictionary value in an array of dictionaries - arrays

Question

I hate to ask this, as I feel I'm missing something super simple, but I've been banging my head on this issue, way too long.
When a user taps on a cell in my collectionView I store the indexPath.row and a value called timeOnIce in an array called tappedArray
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath) as! BenchCollectionViewCell
if cell.cellBackgroundImageView.image == UIImage(named: "collectionviewcell_60x60_white") {
cell.cellBackgroundImageView.image = UIImage(named: "collectionviewcell_60x60_blue")
let currentPlayerSelected = ["indexPath": indexPath.row, "timeOnIce": 0]
tappedArray.append(currentPlayerSelected)
} else {
cell.cellBackgroundImageView.image = UIImage(named: "collectionviewcell_60x60_white")
tappedArray = tappedArray.filter { $0["indexPath"] != indexPath.row }
}
}
A button to start a timer is pressed
func startTimer() {
//start the timer
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateCounters), userInfo: nil, repeats: true)
} //startTimer
If two players are tapped (added to tappedArray) the array looks like the following:
tappedArray [["timeOnIce": 0, "indexPath": 1], ["timeOnIce": 0, "indexPath": 0]]
I'm having the hardest time trying to figure out how to update the timeOnIce in the dictionary to include the timerCounter
#objc func updateCounters() {
timerCounter += 1
for row in tappedArray {
print("row \(row)")
}
//Update tableview
tableView.reloadData()
} //updateCounters
This is what row prints out
row ["timeOnIce": 0, "indexPath": 2]
row ["timeOnIce": 0, "indexPath": 1]
row ["timeOnIce": 0, "indexPath": 0]
If I try the following in the for..in loop
row["timeOnIce"] = timerCounter
I get the following error
`Cannot assign through subscript: 'row' is a 'let' constant`
unless I change loop to the following:
for var row in tappedArray {
print("row \(row)")
row["timeOnIce"] = timerCounter
}
But the value doesn't get updated in the array...

Answer 1

Because Dictionary is a value type in Swift, the for loop makes a copy of the items in the array. To update the original, you can use an index into the array like this:
for row in tappedArray.indices {
print("row \(tappedArray[row])")
tappedArray[row]["timeOnIce"] = timerCounter
}

Answer 2

var dict1 = [String: Any]()
dict1.updateValue("Vanilla", forKey: "Ice Cream")
var dict2 = [String: Any]()
dict2.updateValue("World", forKey: "Hello")
var arr = [[String:Any]]()
arr.append(dict1)
arr.append(dict2)
print("arr-original: ", arr)
for (index, _) in arr.enumerated() {
if arr[index].contains(where: { $0.key == "Hello" }) {
arr[index]["Hello"] = "Dude"
}
}
print("arr-updated: ", arr)