How to make UICollectionView auto scroll using NSTimer?

Question

How to scroll UIcollectionView automatically in Horizontal position using NSTimer

I'm working on my project source below:

- (void)viewDidLoad {
    [super viewDidLoad];

    self.endPoint = CGPointMake(0, self.collectionView.frame.size.width);
    self.scrollingPoint = CGPointMake(0, 0);
    self.scrollingTimer = [NSTimer scheduledTimerWithTimeInterval:0.015 target:self selector:@selector(onTimer) userInfo:nil repeats:YES];

}

- (void)onTimer {
     self.collectionView.contentOffset = self.scrollingPoint;
    if (CGPointEqualToPoint(self.scrollingPoint, self.endPoint)) {
        [self.scrollingTimer invalidate];
    }
    self.scrollingPoint = CGPointMake(self.scrollingPoint.x+1, 0);
}

Tried with the above code, but is not working for me.

Answer 1

Swift 4.2

With Runloop and Timer block. Adjust the 0.015 & 0.25 values to match your required speed.

    var carousalTimer: Timer?
    var newOffsetX: CGFloat = 0.0
    func startTimer() {

        carousalTimer = Timer(fire: Date(), interval: 0.015, repeats: true) { (timer) in

            let initailPoint = CGPoint(x: self.newOffsetX,y :0)

            if __CGPointEqualToPoint(initailPoint, self.collectionView.contentOffset) {

                if self.newOffsetX < self.collectionView.contentSize.width {
                    self.newOffsetX += 0.25
                }
                if self.newOffsetX > self.collectionView.contentSize.width - self.collectionView.frame.size.width {
                    self.newOffsetX = 0
                }

                self.collectionView.contentOffset = CGPoint(x: self.newOffsetX,y :0)

            } else {
                self.newOffsetX = self.collectionView.contentOffset.x
            }
        }

        RunLoop.current.add(carousalTimer!, forMode: .common)
    }

Answer 2

// Swift-3

var timr=Timer()
var w:CGFloat=0.0

override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(true)

        configAutoscrollTimer()
    }

    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidAppear(true)

        deconfigAutoscrollTimer()
    }

func configAutoscrollTimer()
    {

        timr=Timer.scheduledTimer(timeInterval: 0.03, target: self, selector: #selector(dashboard_ViewController.autoScrollView), userInfo: nil, repeats: true)
    }
    func deconfigAutoscrollTimer()
    {
        timr.invalidate()

    }
    func onTimer()
    {
        autoScrollView()
    }

    func autoScrollView()
    {

        let initailPoint = CGPoint(x: w,y :0)

        if __CGPointEqualToPoint(initailPoint, ticker.contentOffset)
        {
            if w<collection_view.contentSize.width
            {
                w += 0.5
            }
            else
            {
                w = -self.view.frame.size.width
            }

            let offsetPoint = CGPoint(x: w,y :0)

            collection_view.contentOffset=offsetPoint

        }
        else
        {
            w=collection_view.contentOffset.x
        }
    }

// this works excellently

Answer 3

 @IBOutlet weak var collection_scroll: UICollectionView! // Outlet
 var Scrollinftimer = Timer() // Set Timer 
 let Image_Scroll : [String] = ["ic_girl1","ic_girl2"] // Set Your Images


func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
{
    return Image_Scroll.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
{
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CustomcollectionCellCollectionViewCell", for: indexPath) as! CustomcollectionCellCollectionViewCell

    cell.img_scrollcoll.image = UIImage(named : Image_Scroll[indexPath.row])

    var rowIndex = indexPath.row
    let Numberofrecords : Int = Image_Scroll.count - 1
    if (rowIndex < Numberofrecords)
    {
        rowIndex = (rowIndex + 0) // 1
    }
    else
    {
        rowIndex = 0
    }

    Scrollinftimer = Timer.scheduledTimer(timeInterval: 5.0, target: self, selector: #selector(ViewController.startTimer(timersset:)), userInfo: rowIndex, repeats: true)


    return cell
}

@objc func startTimer(timersset : Timer)
{
    UIView.animate(withDuration: 1.0, delay: 0, options: .curveEaseOut, animations:
    {
        self.collection_scroll.scrollToItem(at: IndexPath(row: timersset.userInfo! as! Int,section:0), at: .centeredHorizontally, animated: false)
    }, completion: nil)
}