UICollectionView - Horizontaler AutoScroll mit Timer

Question

Ich benutze Horizontal Auto Scroll mit Timer. Ich möchte, dass es eins nach dem anderen blättert.

In meinem Fall ist es Scrollen kontinuierlich von links nach rechts. und zuletzt scrollt es auch Leerraum nach der letzten Zelle.

@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 der benutzerdefinierten Klasse Ihres collectionViewCell:

self.contentView.frame = self.bounds; 
self.contentView.autoresizingMask = UIViewAutoresizingFlexibleWidth | 
            UIViewAutoresizingFlexibleHeight; 

und entfernen Sie alle anderen width Berechnungen.

Answer 2

Ich verwende wie diese

Variable deklarieren

var timer:Timer! 

Anruf von 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)! 
}