ScrollToItem isn't working properly

Question

I have a horizontal collection view of buttons. When one of them is clicked, the user is taken to another view controller. Often times not all buttons are visible, so what I would like, is for the selected button to be of the left most side of the collection view.

I was attempting to do that with the scrollToItem function. The problem is, that it keeps scrolling the collection view all the way to the right each time.

Relevant code:

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return labelArray.count
}

//frees up the collection view when the scroll is active
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
    isScrolling = true
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)

    //possible problem
    if isScrolling == false {
        collectionView.scrollToItem(at: indexPath, at: UICollectionViewScrollPosition.left, animated: false)
    }

    let myLabel = cell.viewWithTag(1) as! UILabel

    let myArray = labelArray[indexPath.row]

    myLabel.text = labelArray[indexPath.row]
    myLabel.textColor = UIColor.white

    if myArray == labelArray[1] {
        cell.backgroundColor = UIColor.black
    } else {
        cell.backgroundColor = UIColor(red: 56/255, green: 120/255, blue: 195/255, alpha: 1)
    }

    return cell
}

Any help would be greatly appreciated.

Answer 1

I got it to work. All I did was change

if isScrolling == false {
    collectionView.scrollToItem(at: indexPath, at: UICollectionViewScrollPosition.left, animated: false)
}

to

if isScrolling == false {
    let i = IndexPath(item: 1, section: 0)
    collectionView.scrollToItem(at: i, at: .right, animated: false)
}

Previously it would scroll to each cell without stopping at each individual one.

So for each item I hard code the value dependent on which section that is selected.