UICollectionView - Horizontal AutoScroll with Timer - objective-c

Question

I am using Horizontal Auto Scroll using timer. I want it to scroll one by one.
In my case it is scrolling continuos from left to right. and in last it also scroll white space after last cell.
#interface AccountsVC ()<UICollectionViewDataSource, UICollectionViewDelegate,UICollectionViewDelegateFlowLayout>
{
CGFloat width_Cell;
NSTimer *autoScrollTimer;
}
- (void)viewDidLoad
{
[super viewDidLoad];
width_Cell = 0.0;
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[self configAutoscrollTimer];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
[self deconfigAutoscrollTimer];
}
- (void)configAutoscrollTimer
{
autoScrollTimer = [NSTimer scheduledTimerWithTimeInterval:0.03 target:self selector:#selector(onTimer) userInfo:nil repeats:YES];
}
- (void)deconfigAutoscrollTimer
{
[autoScrollTimer invalidate];
autoScrollTimer = nil;
}
- (void)onTimer
{
[self autoScrollView];
}
- (void)autoScrollView
{
CGPoint initailPoint = CGPointMake(width_Cell, 0);
if (CGPointEqualToPoint(initailPoint, self.collectionView.contentOffset))
{
if (width_Cell < self.collectionView.contentSize.width)
{
width_Cell += 0.5;
}else
{
width_Cell = -self.view.frame.size.width;
}
CGPoint offsetPoint = CGPointMake(width_Cell, 0);
self.collectionView.contentOffset = offsetPoint;
}else
{
width_Cell = self.collectionView.contentOffset.x;
}
}

Answer 1

In the custom class of your collectionViewCell:
self.contentView.frame = self.bounds;
self.contentView.autoresizingMask = UIViewAutoresizingFlexibleWidth |
UIViewAutoresizingFlexibleHeight;
and remove any other width calculations.

Answer 2

I am using like this
declare variable
var timer:Timer!
call from viewDidLoad
self.addTimer()
func addTimer() {
let timer1 = Timer.scheduledTimer(timeInterval: 3.0, target: self, selector: #selector(self.nextPage), userInfo: nil, repeats: true)
RunLoop.main.add(timer1, forMode: RunLoopMode.commonModes)
self.timer = timer1
}
func resetIndexPath() -> IndexPath {
let currentIndexPath = self.collectionView.indexPathsForVisibleItems.last
let currentIndexPathReset = IndexPath(item: (currentIndexPath?.item)!, section: 0)
self.collectionView.scrollToItem(at: currentIndexPathReset, at: UICollectionViewScrollPosition.left, animated: true)
return currentIndexPath!
}
func removeTimer() {
if self.timer != nil {
self.timer.invalidate()
}
self.timer = nil
}
func nextPage() {
let currentIndexPathReset:IndexPath = self.resetIndexPath()
var nextItem = currentIndexPathReset.item + 1
let nextSection = currentIndexPathReset.section
if nextItem == productImage.count{
nextItem = 0
}
var nextIndexPath = IndexPath(item: nextItem, section: nextSection)
if nextItem == 0 {
self.collectionView.scrollToItem(at: nextIndexPath, at: UICollectionViewScrollPosition.left, animated: false)
}
self.collectionView.scrollToItem(at: nextIndexPath, at: UICollectionViewScrollPosition.left, animated: true)
}
func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
self.addTimer()
}
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
self.removeTimer()
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
var visibleRect = CGRect()
visibleRect.origin = collectionView.contentOffset
visibleRect.size = collectionView.bounds.size
let visiblePoint = CGPoint(x: visibleRect.midX, y: visibleRect.midY)
let visibleIndexPath: IndexPath? = collectionView.indexPathForItem(at: visiblePoint)
pageControlView.currentPage = (visibleIndexPath?.row)!
}