CODEWITHSUNDEEP
iosuicollectionview
Miguelme
Miguelme

Reputation: 629

UICollectionView is scrolling when selecting a cell

I'm having trouble when i try to select an item inside a UICollectionView since when I click on it it scrolls a little bit.

I know didSelectItemAtIndexPath is being called but I want to prevent the scrolling when selecting. I only want the collection view to scroll when the user is scrolling through but if the user is just tapping the cell it shouldn't move. Only should be selected.

I hope you can help me since I don't know how to prevent this problem.

Any help will be really appreciated.

Upvotes: 37

Views: 12281

Answers (6)

Radu Ursache
Radu Ursache

Reputation: 1529

In Swift 5 you can do

let indexPath = IndexPath(item: 10, section: 0)

self.collectionView.selectItem(at: indexPath, animated: false, scrollPosition: .none)

in viewDidAppear or viewDidLayoutSubviews

Upvotes: 5

Ario Liyan
Ario Liyan

Reputation: 345

In my case, I solved the issue by defining a custom UICollectionViewFlowLayout.

    private var flowLayout: UICollectionViewFlowLayout {
        let flowLayout = UICollectionViewFlowLayout()
        flowLayout.sectionInset = UIEdgeInsets(top: 0, left: 5, bottom: 0, right: 5)
        flowLayout.scrollDirection = UICollectionView.ScrollDirection.horizontal
        flowLayout.minimumInteritemSpacing = 15
        return flowLayout
    }

and assigning it to the collectionView

collectionView.collectionViewLayout = flowLayout

Upvotes: 1

Faris
Faris

Reputation: 1236

swift 5

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

        collectionView.scrollToItem(at: indexPath, at: .centeredHorizontally, animated: true)

}

Upvotes: -3

xaphod
xaphod

Reputation: 6804

If you are selecting the cell programmatically with collectionview.selectItem(at: indexpath, animated: true, scrollPosition: .top) -- and since you didn't share any of your code with us, let's assume that's correct...

... then like me you might not have realized that you can use an empty set like this: collectionview.selectItem(at: indexpath, animated: true, scrollPosition: [])

Upvotes: 107

zhangbangjun
zhangbangjun

Reputation: 41

You can try this: 

collectionView.selectItem(at: newIdexPath, animated: true, scrollPosition: UICollectionViewScrollPosition(rawValue: 0))

Upvotes: 3

CodeSmith
CodeSmith

Reputation: 1691

This can happen if you have paging enabled and the CollectionView is manually scrolled to a position that doesn't align with the expected page boundaries. When you select the cell, it adjusts to put the CollectionView at the correct page boundaries.

Upvotes: 12

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