Ios 按单元格而不是屏幕分页UICollectionView
我有水平滚动的Ios 按单元格而不是屏幕分页UICollectionView,ios,objective-c,uicollectionview,uicollectionviewlayout,Ios,Objective C,Uicollectionview,Uicollectionviewlayout,我有水平滚动的UICollectionView，在整个屏幕上总是有两个单元格并排出现。我需要在单元格开始时停止滚动。启用分页后，集合视图将滚动整个页面（一次滚动两个单元格），然后停止 我需要启用单个单元格的滚动，或在单元格边缘停止的多个单元格的滚动 我试图将UICollectionViewFlowLayout子类化，并实现方法targetContentOffsetForProposedContentOffset，但到目前为止，我只能中断我的集合视图，它停止了滚动。有没有更简单的方法来实现这一点以
UICollectionView我试图将
UICollectionViewFlowLayouttargetContentOffsetForProposedContentOffsetUICollectionViewFlowLayout我应该在开头搜索
targetContentOffsetForProposedContentOffset- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
*targetContentOffset = scrollView.contentOffset; // set acceleration to 0.0
float pageWidth = (float)self.articlesCollectionView.bounds.size.width;
int minSpace = 10;
int cellToSwipe = (scrollView.contentOffset.x)/(pageWidth + minSpace) + 0.5; // cell width + min spacing for lines
if (cellToSwipe < 0) {
cellToSwipe = 0;
} else if (cellToSwipe >= self.articles.count) {
cellToSwipe = self.articles.count - 1;
}
[self.articlesCollectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForRow:cellToSwipe inSection:0] atScrollPosition:UICollectionViewScrollPositionLeft animated:YES];
}
-（void）ScrollViewWillendDraging:（UIScrollView*）带速度的scrollView:（CGPoint）速度targetContentOffset:（inout CGPoint*）targetContentOffset{
*targetContentOffset=scrollView.contentOffset；//将加速度设置为0.0
float pageWidth=（float）self.articlesCollectionView.bounds.size.width；
int minSpace=10；
int cellToSwipe=（scrollView.contentOffset.x）/（pageWidth+minSpace）+0.5；//单元格宽度+行的最小间距
if（cellToSwipe<0）{
cellToSwipe=0；
}else if（cellToSwipe>=self.articles.count）{
cellToSwipe=self.articles.count-1；
}
[self.articlesCollectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForRow:CellToSweep-inSection:0]在ScrollPosition:UICollectionViewScrollPositionLeft动画：是]；
}
flowLayoutUICollectionViewFlowLayoutoverride func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
if let collectionView = collectionView {
targetContentOffset.memory = scrollView.contentOffset
let pageWidth = CGRectGetWidth(scrollView.frame) + flowLayout.minimumInteritemSpacing
var assistanceOffset : CGFloat = pageWidth / 3.0
if velocity.x < 0 {
assistanceOffset = -assistanceOffset
}
let assistedScrollPosition = (scrollView.contentOffset.x + assistanceOffset) / pageWidth
var targetIndex = Int(round(assistedScrollPosition))
if targetIndex < 0 {
targetIndex = 0
}
else if targetIndex >= collectionView.numberOfItemsInSection(0) {
targetIndex = collectionView.numberOfItemsInSection(0) - 1
}
print("targetIndex = \(targetIndex)")
let indexPath = NSIndexPath(forItem: targetIndex, inSection: 0)
collectionView.scrollToItemAtIndexPath(indexPath, atScrollPosition: .Left, animated: true)
}
}
override func ScrollViewWillendDraging（scrollView:UIScrollView，withVelocity:CGPoint，targetContentOffset:UnsafemeutablePointer）{
如果让collectionView=collectionView{
targetContentOffset.memory=scrollView.contentOffset
让pageWidth=CGRectGetWidth（scrollView.frame）+flowLayout.MinimumineItemSpacing
var assistanceOffset:CGFloat=pageWidth/3.0
如果速度.x<0{
assistanceOffset=-assistanceOffset
}
让assistedScrollPosition=（scrollView.contentOffset.x+assistanceOffset）/pageWidth
var targetIndex=Int（圆形（辅助CrollPosition））
如果targetIndex<0{
targetIndex=0
}
如果targetIndex>=collectionView.numberOfItemsInSection（0），则为else{
targetIndex=collectionView.numberOfItemsInSection（0）-1
}
打印（“targetIndex=\（targetIndex）”）
让indexPath=NSIndexPath（forItem:targetIndex，第0节）
collectionView.scrollToItemAtIndexPath（indexPath，atScrollPosition:。左侧，动画：true）
}
}
您可以使用
UIPageViewController- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
if ([scrollView isKindOfClass:[UICollectionView class]]) {
UICollectionView* collectionView = (UICollectionView*)scrollView;
if ([collectionView.collectionViewLayout isKindOfClass:[UICollectionViewFlowLayout class]]) {
UICollectionViewFlowLayout* layout = (UICollectionViewFlowLayout*)collectionView.collectionViewLayout;
CGFloat pageWidth = layout.itemSize.width + layout.minimumInteritemSpacing;
CGFloat usualSideOverhang = (scrollView.bounds.size.width - pageWidth)/2.0;
// k*pageWidth - usualSideOverhang = contentOffset for page at index k if k >= 1, 0 if k = 0
// -> (contentOffset + usualSideOverhang)/pageWidth = k at page stops
NSInteger targetPage = 0;
CGFloat currentOffsetInPages = (scrollView.contentOffset.x + usualSideOverhang)/pageWidth;
targetPage = velocity.x < 0 ? floor(currentOffsetInPages) : ceil(currentOffsetInPages);
targetPage = MAX(0,MIN(self.projects.count - 1,targetPage));
*targetContentOffset = CGPointMake(MAX(targetPage*pageWidth - usualSideOverhang,0), 0);
}
}
}
-（void）ScrollViewWillendDraging:（UIScrollView*）带速度的scrollView:（CGPoint）速度targetContentOffset:（inout CGPoint*）targetContentOffset{
if（[scrollView是类：[UICollectionView类]]）{
UICollectionView*collectionView=（UICollectionView*）滚动视图；
如果（[collectionView.collectionViewLayout是类的种类：[UICollectionViewFlowLayout类]]）{
UICollectionViewFlowLayout*布局=（UICollectionViewFlowLayout*）collectionView.collectionViewLayout；
CGFloat pageWidth=layout.itemSize.width+layout.minimuminetemspacing；
CGFloat usualSideOverhang=（scrollView.bounds.size.width-pageWidth）/2.0；
//k*pageWidth-usualSideOverhang=索引k处的页面的内容偏移量（如果k>=1），如果k=0，则为0
//->（contentOffset+usualSideOverhang）/pageWidth=k在页面停止处
NSInteger targetPage=0；
CGFloat currentOffsetingPages=（scrollView.contentOffset.x+usualSideOverhang）/pageWidth；
targetPage=velocity.x<0？楼层（currentOffsetInPages）：ceil（currentOffsetInPages）；
targetPage=MAX（0，MIN（self.projects.count-1，targetPage））；
*targetContentOffset=CGPointMake（最大值（targetPage*pageWidth-usualSideOverhang，0），0）；
}
}
}
collectionLayoutUICollectionViewFlowLayout（）Evya答案的Swift 3版本：
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
targetContentOffset.pointee = scrollView.contentOffset
let pageWidth:Float = Float(self.view.bounds.width)
let minSpace:Float = 10.0
var cellToSwipe:Double = Double(Float((scrollView.contentOffset.x))/Float((pageWidth+minSpace))) + Double(0.5)
if cellToSwipe < 0 {
cellToSwipe = 0
} else if cellToSwipe >= Double(self.articles.count) {
cellToSwipe = Double(self.articles.count) - Double(1)
}
let indexPath:IndexPath = IndexPath(row: Int(cellToSwipe), section:0)
self.collectionView.scrollToItem(at:indexPath, at: UICollectionViewScrollPosition.left, animated: true)
}
func-scrollViewWillendDraging（scrollView:UIScrollView，withVelocity:CGPoint，targetContentOffset:UnsafemeutablePointer）{
targetContentOffset.pointee=scrollView.contentOffset
let pageWidth:Float=Float（self.view.bounds.width）
让minSpace:Float=10.0
var cellToSwipe:Double=Double（Float（（scrollView.contentOffset.x））/Float（（pageWidth+minSpace））+Double（0.5）
如果cellToSwipe<0{
cellToSwipe=0
}如果cellToSwipe>=Double（self.articles.count）{
cellToSwipe=Double（self.articles.count）-Double（1）
}
让indexPath:indexPath=indexPath（行：Int（cellToSwipe），节：0）
self.collectionView.scrollToItem（at:indexPath，at:UICollectionViewScrollPosition.left，动画：true）
}
override func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
targetContentOffset.pointee = scrollView.contentOffset
var factor: CGFloat = 0.5
if velocity.x < 0 {
factor = -factor
}
let indexPath = IndexPath(row: (scrollView.contentOffset.x/cellSize.width + factor).int, section: 0)
collectionView?.scrollToItem(at: indexPath, at: .left, animated: true)
}
override func scrollView willenddragging（uscrollview:UIScrollView，带速度：CGPoint，targetContentO
override func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
targetContentOffset.pointee = scrollView.contentOffset
var factor: CGFloat = 0.5
if velocity.x < 0 {
factor = -factor
}
let indexPath = IndexPath(row: (scrollView.contentOffset.x/cellSize.width + factor).int, section: 0)
collectionView?.scrollToItem(at: indexPath, at: .left, animated: true)
}
override func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -> CGPoint {
guard let collectionView = self.collectionView else {
let latestOffset = super.targetContentOffset(forProposedContentOffset: proposedContentOffset, withScrollingVelocity: velocity)
return latestOffset
}
// Page height used for estimating and calculating paging.
let pageHeight = self.itemSize.height + self.minimumLineSpacing
// Make an estimation of the current page position.
let approximatePage = collectionView.contentOffset.y/pageHeight
// Determine the current page based on velocity.
let currentPage = velocity.y == 0 ? round(approximatePage) : (velocity.y < 0.0 ? floor(approximatePage) : ceil(approximatePage))
// Create custom flickVelocity.
let flickVelocity = velocity.y * 0.3
// Check how many pages the user flicked, if <= 1 then flickedPages should return 0.
let flickedPages = (abs(round(flickVelocity)) <= 1) ? 0 : round(flickVelocity)
let newVerticalOffset = ((currentPage + flickedPages) * pageHeight) - collectionView.contentInset.top
return CGPoint(x: proposedContentOffset.x, y: newVerticalOffset)
}
override func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -> CGPoint {
guard let collectionView = self.collectionView else {
let latestOffset = super.targetContentOffset(forProposedContentOffset: proposedContentOffset, withScrollingVelocity: velocity)
return latestOffset
}
// Page width used for estimating and calculating paging.
let pageWidth = self.itemSize.width + self.minimumInteritemSpacing
// Make an estimation of the current page position.
let approximatePage = collectionView.contentOffset.x/pageWidth
// Determine the current page based on velocity.
let currentPage = velocity.x == 0 ? round(approximatePage) : (velocity.x < 0.0 ? floor(approximatePage) : ceil(approximatePage))
// Create custom flickVelocity.
let flickVelocity = velocity.x * 0.3
// Check how many pages the user flicked, if <= 1 then flickedPages should return 0.
let flickedPages = (abs(round(flickVelocity)) <= 1) ? 0 : round(flickVelocity)
// Calculate newHorizontalOffset.
let newHorizontalOffset = ((currentPage + flickedPages) * pageWidth) - collectionView.contentInset.left
return CGPoint(x: newHorizontalOffset, y: proposedContentOffset.y)
}
var itemCellSize: CGSize = <your cell size>
var itemCellsGap: CGFloat = <gap in between>
override func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
let pageWidth = (itemCellSize.width + itemCellsGap)
let itemIndex = (targetContentOffset.pointee.x) / pageWidth
targetContentOffset.pointee.x = round(itemIndex) * pageWidth - (itemCellsGap / 2)
}
// CollectionViewFlowLayoutDelegate
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return itemCellSize
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return itemCellsGap
}
// === Defaults ===
let bannerSize = CGSize(width: 280, height: 170)
let pageWidth: CGFloat = 290 // ^ + paging
let insetLeft: CGFloat = 20
let insetRight: CGFloat = 20
// ================
var pageScrollView: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
// Create fake scrollview to properly handle paging
pageScrollView = UIScrollView(frame: CGRect(origin: .zero, size: CGSize(width: pageWidth, height: 100)))
pageScrollView.isPagingEnabled = true
pageScrollView.alwaysBounceHorizontal = true
pageScrollView.showsVerticalScrollIndicator = false
pageScrollView.showsHorizontalScrollIndicator = false
pageScrollView.delegate = self
pageScrollView.isHidden = true
view.insertSubview(pageScrollView, belowSubview: collectionView)
// Set desired gesture recognizers to the collection view
for gr in pageScrollView.gestureRecognizers! {
collectionView.addGestureRecognizer(gr)
}
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if scrollView == pageScrollView {
// Return scrolling back to the collection view
collectionView.contentOffset.x = pageScrollView.contentOffset.x
}
}
func refreshData() {
...
refreshScroll()
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
refreshScroll()
}
/// Refresh fake scrolling view content size if content changes
func refreshScroll() {
let w = collectionView.width - bannerSize.width - insetLeft - insetRight
pageScrollView.contentSize = CGSize(width: pageWidth * CGFloat(banners.count) - w, height: 100)
}
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
let pageWidth = // The width your page should have (plus a possible margin)
let proportionalOffset = collectionView.contentOffset.x / pageWidth
indexOfCellBeforeDragging = Int(round(proportionalOffset))
}
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
// Stop scrolling
targetContentOffset.pointee = scrollView.contentOffset
// Calculate conditions
let pageWidth = // The width your page should have (plus a possible margin)
let collectionViewItemCount = // The number of items in this section
let proportionalOffset = collectionView.contentOffset.x / pageWidth
let indexOfMajorCell = Int(round(proportionalOffset))
let swipeVelocityThreshold: CGFloat = 0.5
let hasEnoughVelocityToSlideToTheNextCell = indexOfCellBeforeDragging + 1 < collectionViewItemCount && velocity.x > swipeVelocityThreshold
let hasEnoughVelocityToSlideToThePreviousCell = indexOfCellBeforeDragging - 1 >= 0 && velocity.x < -swipeVelocityThreshold
let majorCellIsTheCellBeforeDragging = indexOfMajorCell == indexOfCellBeforeDragging
let didUseSwipeToSkipCell = majorCellIsTheCellBeforeDragging && (hasEnoughVelocityToSlideToTheNextCell || hasEnoughVelocityToSlideToThePreviousCell)
if didUseSwipeToSkipCell {
// Animate so that swipe is just continued
let snapToIndex = indexOfCellBeforeDragging + (hasEnoughVelocityToSlideToTheNextCell ? 1 : -1)
let toValue = pageWidth * CGFloat(snapToIndex)
UIView.animate(
withDuration: 0.3,
delay: 0,
usingSpringWithDamping: 1,
initialSpringVelocity: velocity.x,
options: .allowUserInteraction,
animations: {
scrollView.contentOffset = CGPoint(x: toValue, y: 0)
scrollView.layoutIfNeeded()
},
completion: nil
)
} else {
// Pop back (against velocity)
let indexPath = IndexPath(row: indexOfMajorCell, section: 0)
collectionView.scrollToItem(at: indexPath, at: .left, animated: true)
}
}
/**
A UICollectionViewFlowLayout with...
- paged horizontal scrolling
- itemSize is the same as the collectionView bounds.size
*/
class PagedFlowLayout: UICollectionViewFlowLayout {
override init() {
super.init()
self.scrollDirection = .horizontal
self.minimumLineSpacing = 8 // line spacing is the horizontal spacing in horizontal scrollDirection
self.minimumInteritemSpacing = 0
if #available(iOS 11.0, *) {
self.sectionInsetReference = .fromSafeArea // for iPhone X
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("not implemented")
}
// Note: Setting `minimumInteritemSpacing` here will be too late. Don't do it here.
override func prepare() {
super.prepare()
guard let collectionView = collectionView else { return }
collectionView.decelerationRate = UIScrollViewDecelerationRateFast // mostly you want it fast!
let insetedBounds = UIEdgeInsetsInsetRect(collectionView.bounds, self.sectionInset)
self.itemSize = insetedBounds.size
}
// Table: Possible cases of targetContentOffset calculation
// -------------------------
// start | |
// near | velocity | end
// page | | page
// -------------------------
// 0 | forward | 1
// 0 | still | 0
// 0 | backward | 0
// 1 | forward | 1
// 1 | still | 1
// 1 | backward | 0
// -------------------------
override func targetContentOffset( //swiftlint:disable:this cyclomatic_complexity
forProposedContentOffset proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -> CGPoint {
guard let collectionView = collectionView else { return proposedContentOffset }
let pageWidth = itemSize.width + minimumLineSpacing
let currentPage: CGFloat = collectionView.contentOffset.x / pageWidth
let nearestPage: CGFloat = round(currentPage)
let isNearPreviousPage = nearestPage < currentPage
var pageDiff: CGFloat = 0
let velocityThreshold: CGFloat = 0.5 // can customize this threshold
if isNearPreviousPage {
if velocity.x > velocityThreshold {
pageDiff = 1
}
} else {
if velocity.x < -velocityThreshold {
pageDiff = -1
}
}
let x = (nearestPage + pageDiff) * pageWidth
let cappedX = max(0, x) // cap to avoid targeting beyond content
//print("x:", x, "velocity:", velocity)
return CGPoint(x: cappedX, y: proposedContentOffset.y)
}
}
var pagesSizes = [CGSize]()
func scrollViewDidScroll(_ scrollView: UIScrollView) {
defer {
lastOffsetY = scrollView.contentOffset.y
}
if collectionView.isDecelerating {
var currentPage = 0
var currentPageBottom = CGFloat(0)
for pagesSize in pagesSizes {
currentPageBottom += pagesSize.height
if currentPageBottom > collectionView!.contentOffset.y {
break
}
currentPage += 1
}
if collectionView.contentOffset.y > currentPageBottom - pagesSizes[currentPage].height, collectionView.contentOffset.y + collectionView.frame.height < currentPageBottom {
return // 100% of view within bounds
}
if lastOffsetY < collectionView.contentOffset.y {
if currentPage + 1 != pagesSizes.count {
collectionView.setContentOffset(CGPoint(x: 0, y: currentPageBottom), animated: true)
}
} else {
collectionView.setContentOffset(CGPoint(x: 0, y: currentPageBottom - pagesSizes[currentPage].height), animated: true)
}
}
}
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
targetContentOffset.pointee = scrollView.contentOffset
var indexes = self.collectionView.indexPathsForVisibleItems
indexes.sort()
var index = indexes.first!
let cell = self.collectionView.cellForItem(at: index)!
let position = self.collectionView.contentOffset.x - cell.frame.origin.x
if position > cell.frame.size.width/2{
index.row = index.row+1
}
self.collectionView.scrollToItem(at: index, at: .left, animated: true )
}
let layout = PagingCollectionViewLayout()
layout.itemSize =
layout.minimumLineSpacing =
layout.scrollDirection =
final class PagingFlowLayout: UICollectionViewFlowLayout {
private var currentIndex = 0
override func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -> CGPoint {
let count = collectionView!.numberOfItems(inSection: 0)
let currentAttribute = layoutAttributesForItem(
at: IndexPath(item: currentIndex, section: 0)
) ?? UICollectionViewLayoutAttributes()
let direction = proposedContentOffset.x > currentAttribute.frame.minX
if collectionView!.contentOffset.x + collectionView!.bounds.width < collectionView!.contentSize.width || currentIndex < count - 1 {
currentIndex += direction ? 1 : -1
currentIndex = max(min(currentIndex, count - 1), 0)
}
let indexPath = IndexPath(item: currentIndex, section: 0)
let closestAttribute = layoutAttributesForItem(at: indexPath) ?? UICollectionViewLayoutAttributes()
let centerOffset = collectionView!.bounds.size.width / 2
return CGPoint(x: closestAttribute.center.x - centerOffset, y: 0)
}
}
var offsetScroll1 : CGFloat = 0
var offsetScroll2 : CGFloat = 0
let flowLayout = UICollectionViewFlowLayout()
let screenSize : CGSize = UIScreen.main.bounds.size
var items = ["1", "2", "3", "4", "5"]
override func viewDidLoad() {
super.viewDidLoad()
flowLayout.scrollDirection = .horizontal
flowLayout.minimumLineSpacing = 7
let collectionView = UICollectionView(frame: CGRect(x: 0, y: 590, width: screenSize.width, height: 200), collectionViewLayout: flowLayout)
collectionView.register(collectionViewCell1.self, forCellWithReuseIdentifier: cellReuseIdentifier)
collectionView.delegate = self
collectionView.dataSource = self
collectionView.backgroundColor = UIColor.clear
collectionView.showsHorizontalScrollIndicator = false
self.view.addSubview(collectionView)
}
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
offsetScroll1 = offsetScroll2
}
func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
offsetScroll1 = offsetScroll2
}
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>){
let indexOfMajorCell = self.desiredIndex()
let indexPath = IndexPath(row: indexOfMajorCell, section: 0)
flowLayout.collectionView!.scrollToItem(at: indexPath, at: .centeredHorizontally, animated: true)
targetContentOffset.pointee = scrollView.contentOffset
}
private func desiredIndex() -> Int {
var integerIndex = 0
print(flowLayout.collectionView!.contentOffset.x)
offsetScroll2 = flowLayout.collectionView!.contentOffset.x
if offsetScroll2 > offsetScroll1 {
integerIndex += 1
let offset = flowLayout.collectionView!.contentOffset.x / screenSize.width
integerIndex = Int(round(offset))
if integerIndex < (items.count - 1) {
integerIndex += 1
}
}
if offsetScroll2 < offsetScroll1 {
let offset = flowLayout.collectionView!.contentOffset.x / screenSize.width
integerIndex = Int(offset.rounded(.towardZero))
}
let targetIndex = integerIndex
return targetIndex
}
func scrollViewWillEndDragging(
_ scrollView: UIScrollView,
withVelocity velocity: CGPoint,
targetContentOffset: UnsafeMutablePointer<CGPoint>
) {
targetContentOffset.pointee = scrollView.contentOffset
var indexes = collection.indexPathsForVisibleItems
indexes.sort()
var index = indexes.first!
if velocity.x > 0 {
index.row += 1
} else if velocity.x == 0 {
let cell = self.collection.cellForItem(at: index)!
let position = self.collection.contentOffset.x - cell.frame.origin.x
if position > cell.frame.size.width / 2 {
index.row += 1
}
}
self.collection.scrollToItem(at: index, at: .centeredHorizontally, animated: true )
}
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
targetContentOffset.pointee = scrollView.contentOffset
var indexes = yourCollectionView.indexPathsForVisibleItems
indexes.sort()
var index = indexes.first!
// if velocity.x > 0 && (Get the number of items from your data) > index.row + 1 {
if velocity.x > 0 && yourCollectionView.numberOfItems(inSection: 0) > index.row + 1 {
index.row += 1
} else if velocity.x == 0 {
let cell = yourCollectionView.cellForItem(at: index)!
let position = yourCollectionView.contentOffset.x - cell.frame.origin.x
if position > cell.frame.size.width / 2 {
index.row += 1
}
}
yourCollectionView.scrollToItem(at: index, at: .centeredHorizontally, animated: true )
}
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
targetContentOffset.pointee = scrollView.contentOffset
//M: Get the first visiable item's indexPath from visibaleItems.
var indexPaths = *YOURCOLLECTIONVIEW*.indexPathsForVisibleItems
indexPaths.sort()
var indexPath = indexPaths.first!
//M: Use the velocity to detect the paging control movement.
//M: If the movement is forward, then increase the indexPath.
if velocity.x > 0{
indexPath.row += 1
//M: If the movement is in the next section, which means the indexPath's row is out range. We set the indexPath to the first row of the next section.
if indexPath.row == *YOURCOLLECTIONVIEW*.numberOfItems(inSection: indexPath.section){
indexPath.row = 0
indexPath.section += 1
}
}
else{
//M: If the movement is backward, the indexPath will be automatically changed to the first visiable item which is indexPath.row - 1. So there is no need to write the logic.
}
//M: Tell the collection view to scroll to the next item.
*YOURCOLLECTIONVIEW*.scrollToItem(at: indexPath, at: .left, animated: true )
}
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity
velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
targetContentOffset.pointee = scrollView.contentOffset
var indexes = self.collectionHome.indexPathsForVisibleItems
indexes.sort()
var index = indexes.first!
let cell = self.collectionHome.cellForItem(at: index)!
let position = self.collectionHome.contentOffset.x - cell.frame.origin.x
if position > cell.frame.size.width/2{
index.row = index.row+1
}
self.collectionHome.scrollToItem(at: index, at: .left, animated: true )
}