My app displays comments, and users can like these comments. The app uses a diffable data source, and when I click on the last row to like the comment, the collection view scrolls to the centre.
Here is a video of the issue
https://streamable.com/9vijyx
(sorry about he music, my baby daughter was dancing)
Here is some of my code that I think is relevant - you'll see by the comments that I have tried to fix this issue by storing the content offset but it feels VERY hacky. Any help would be greatly appreciated.
				self.datasource = UICollectionViewDiffableDataSource<Section, PostDetail>(collectionView: self.collectionView) {
						(collectionView: UICollectionView, indexPath: IndexPath, userComment: PostDetail) -> UICollectionViewCell? in
						guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: PostDetailCell.reuseIdentifier, for: indexPath) as? PostDetailCell else { fatalError("Cannot create cell")}
						cell.user = self.user
						cell.postDetail = userComment
						cell.likeCommentDelegate = self
						return cell
				}
				var snapshot = NSDiffableDataSourceSnapshot<Section, PostDetail>()
				snapshot.appendSections([.main])
				snapshot.appendItems(self.userComments)
				self.datasource.apply(snapshot, animatingDifferences: true)
		}
		fileprivate func applySnapshot() {
				//Any updates to the snapshot, including likes, will
				//scroll the collectionView, but we want to stay on the cell
				// the user has liked, not scroll, so we store the offset.
				//This is then restored after all updates are complete.
				//let contentOffset = self.collectionView.contentOffset
				var snapshot = NSDiffableDataSourceSnapshot<Section, PostDetail>()
				snapshot.appendSections([.main])
				snapshot.appendItems(self.userComments)
				self.datasource.apply(snapshot, animatingDifferences: true)
				//self.collectionView.contentOffset = contentOffset
		}
		func handleCommentLike(cell: PostDetailCell) {
				print("handle like comment")
				guard let indexPath = self.collectionView.indexPath(for: cell) else { return }
				if self.userComments[indexPath.row].like == nil {
						let userId = user.id
						let postId = feedItem.post.id
						let commentId = self.userComments[indexPath.row].comment.id
						let timestamp = Int(Date().timeIntervalSince1970)
						let commentLike = CommentLike(postId: postId, userId: userId, commentId: commentId, createdTimestamp: timestamp)
						self.viewModel.createLike(commentLike: commentLike) { result in
								switch result {
								case .success(let commentLike):
										print("\(commentLike)")
										//
										self.userComments[indexPath.row].like = commentLike
										self.applySnapshot()
								case .failure(let error):
										print("Error creating like: \(error)")
								}
						}
				} else {
						guard let like = self.userComments[indexPath.row].like else { return }
						self.viewModel.un(commentLike: like) { result in
								switch result {
								case .success(let like):
										print(like)
										self.userComments[indexPath.row].like = nil
										self.applySnapshot()
								case .failure(let error):
										print(error)
								}
						}
				}
		}
mickeysox
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Please watch this video of my app, basically when I login as a user, my profile tab works perfectly, but as soon as I click the search button and create a new instance of my profile controller, the profile tab, does not work. It feels like the memory is being overwritten.
https://streamable.com/4yhxgd