Auto Scroll to Top

Question

I was able to get it to auto scroll to the top upon opening the app, but now it won't let you scroll anymore because of the scrollView forcefully keeping it at the top due to willDisplay.

func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
    if info.count > 0 {
        collectionView.scrollToItem(at: IndexPath(item:info.count - 1, section: 0), at: .top, animated: false)
    }
}

Where else can I put it?

Answer 1

Use the following code to achieve your needs. For animation, you just need to pass value true/false in animated of scrollToRow function. Hope this will help you!

To scroll top without animation

func scrollToTopWithoutAnimation() {
     DispatchQueue.main.async {
         if self.dataArray.count > 0 {
             let indexPath = IndexPath(row: 0, section: 0)
             collectionView.scrollToItem(at: indexPath, at: .top, animated: false)
         }
     }
}

To scroll top with animation

func scrollToTopWithAnimation() {
     DispatchQueue.main.async {
         if self.dataArray.count > 0 {
             let indexPath = IndexPath(row: 0, section: 0)
             collectionView.scrollToItem(at: indexPath, at: .top, animated: true)

         }
     }
}