I'm making use of UICollectionView and I need to scroll to first cell after click in a button.
The button is located in a (big) header section in my collection view... when clicking int it, I need scroll to my first cell located bellow of this button.
I created a action of this button, but I don't know how to scroll to first UICollectionViewCell.
Can someone help me?
Use this delegate method, setting the indexPath at the first position:
Swift
self.collectionView?.scrollToItemAtIndexPath(NSIndexPath(forItem: 0, inSection: 0),
atScrollPosition: .Top,
animated: true)
Swift 3
self.collectionView?.scrollToItem(at: IndexPath(row: 0, section: 0),
at: .top,
animated: true)
Objective-C
[self.collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForItem:0 inSection:0]
atScrollPosition:UICollectionViewScrollPositionTop
animated:YES];
Change UICollectionViewScrollPositionTop
if you want to scroll and stop at a different position
可以使用UIScrollView相关属性
collectionView.contentOffset.x = 0
您可以将此用于Objective-C
[self.restaurantCollectionView setContentOffset:CGPointZero animated:YES];
The following solution works fine for me:
UIView.animate(withDuration: 0.5, animations: {
self.collectionView?.contentOffset.x = 0
})
It scrolls to the first item and the contentInset can be seen as well.
默认CollectionView Delgeate ...
- (void)scrollToItemAtIndexPath:(NSIndexPath *)indexPath atScrollPosition:(UICollectionViewScrollPosition)scrollPosition animated:(BOOL)animated;
if let indexPath = self.collectionView?.indexPathForItem(at: CGPoint(x: 0, y: 0)) {
self.collectionView?.scrollToItem(at: indexPath, at: .top, animated: false)
}
scrollView.setContentOffset(CGPoint(x: 0.0, y: 0.0), animated: true)
I found to work reliably on all devices and correctly handle iPhone X-style safe areas.
let top = CGPoint(x: collectionView.contentOffset.x,
y: collectionView.adjustedContentInset.top)
collectionView.setContentOffset(top, animated: false)
(This scrolls vertically to the top but you could easily make it scroll to the top-left if you wanted.)
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