How to auto scroll a UICollectionView inside a UITableView using Timer?

Question

I want my banners in my application to auto scroll using timer. I can perform scrolling if the collection view is alone but i don't know how to perform it when my collection view is inside a tableview.

var r = 0
let t = Timer.init(timeInterval: 2, repeats: true) { (timer) in
    let index = IndexPath(item: r, section: 0)
    cell.cltView.scrollToItem(at: index, at: .left, animated: true)
    if r == 6 {
       r = 0
    }else {
       r = r+1
    }
}

i am using this code inside cellForRowAt indexPath but it does not seem to work.

Answer 1

The timer has only initialised now, not used yet. To begin the process you need to add :-

t.fire()

Answer 2

I have achieved my goal by creating a function and then calling it on cellForItemAt and it solved my problem.

func scrollCollection(cltView: UICollectionView) {
    var r = 0

    let t = Timer.scheduledTimer(withTimeInterval: 2, repeats: true) { (timer) in
        print(r)
        let index = IndexPath(item: r, section: 0)
        cltView.scrollToItem(at: index, at: .left, animated: true)
        if r == 6 {
            r = 0
        }else {
            r = r+1
        }
    }
    t.fire()

}

this is the function i used and i just called it

let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)

let mainImg = cell.viewWithTag(20) as! UIImageView

mainImg.image = UIImage(named: banners[indexPath.item])
if op {
    scrollCollection(cltView: collectionView)
    op = false
}

return cell

i put a check marker so that i don't call it again and again.