uicollectionview

问题 I have a view controller that displays a collection view with self-sizing cells. The collection view has one section that scrolls horizontally. It looks like this: Problem The collection view behaves unexpectedly when the view controller is presented using the default pageSheet style on iOS 13+. When pulling upward on the sheet, cells may appear to resize like the cell labeled "Rectify" below: When pulling upward on the sheet, the content may shift horizontally. Sometimes, cells may disappear

问题 I'm trying to create a custom top swipe menu that has a moving resizing orange bar that denotes which tab is selected. This is an extremely common design and I'm just doing this for practice as I am new to swift. You navigate by either swiping through the bottom collectionView or you can select a tab on the top menu. The top menu is also just a collectionView and is scrollable as well. As you can see below (first gif), my problem is that when I try to go back to the first tab, whether by

问题 Im using UIcollection view as my tabbar when I scroll collection view horizontally previous selected cell will not deselect when i select new one this is my code to change colour when i select a cell and deselect a cell var selectedIndexPath : IndexPath = [] func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { if let cell = collectionView.cellForItem(at: indexPath) as? BottomCollectionViewCell { cell.contentView.backgroundColor = UIColor.orange cell

问题 I'm trying to accomplish the following: I've followed the answer in this question, but I get the image below: This is the code for the collection view controller: class MainMenuViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout { @IBOutlet var collectionView: UICollectionView! @IBOutlet weak var dateTimeLabel: MarqueeLabel! @IBOutlet weak var iconButton: UIButton! @IBOutlet var imageView: UIImageView! var iconButtonTimer:

问题 I have a UICollectionView inside UITableViewCell . When I select the a tableView row, I do not want the didSelectItemAtIndexPath: method of UICollectionView to get called. Instead I want didSelectRowAtIndexPath: method of UITableView to get called. How would I call didSelectRowAtIndexPath: in didSelectItemAtIndexPath: ? 回答1: Set collectionView.allowsSelection = NO to disable selection. OR in the didSelectItemAtIndexPath method, grab the UITableViewCell and call the delegate which is the table

问题 i have a collectionview that i am trying to scroll programatically. the problem being that if the cell i want to scroll to is visible in the collection view it doesn't scroll it to the centre. so for the image below the lower cell is item 1. and it does not scroll to it but it will scroll past item 1 to item 2. i have been trying to use UICollectionVieScrollPosition.CenterVertically but this does not seem to work. self.collectionView?.scrollToItem(at: IndexPath(row: 1, section: 0), at:

问题 I set up a collection view and its layout with the new compositional stuff and it has been pretty cool, it seems to be very expandable but I can't find a way to make items centered in the collection, which is IMO a basic feature that one would imagine being supported.. What I have is: Accomplished with this code: UICollectionViewCompositionalLayout { section, env in let tagDefaultSize = CGSize(width: 100, height: 40) let item = NSCollectionLayoutItem( layoutSize: NSCollectionLayoutSize

问题 I'm currently facing the issue, that when applying a new snapshot to my current data source, that the header, footer and decoration views are not part of the collection view's subviews, which can be noticed as a weird flicker. Did anyone face that issue before? I update the data source via: var snapshot = NSDiffableDataSourceSnapshot<Section, Item>() snapshot.appendSections(Sections.allCases) items.forEach { snapshot.appendItems([$0], toSection: ItemSectionMapper.getSection(for: $0)) } self

问题 I'm currently facing the issue, that when applying a new snapshot to my current data source, that the header, footer and decoration views are not part of the collection view's subviews, which can be noticed as a weird flicker. Did anyone face that issue before? I update the data source via: var snapshot = NSDiffableDataSourceSnapshot<Section, Item>() snapshot.appendSections(Sections.allCases) items.forEach { snapshot.appendItems([$0], toSection: ItemSectionMapper.getSection(for: $0)) } self

问题 I'm using UICollectionView to create a gallery app for iOS. I'd like for users to be able to drag and drop images to reorder the gallery and to create folders (similar to the home screen on the iPhone). I found the following tutorial to implement drag and drop reordering. However, I'm having an trouble figuring out where to start on the folder creation. What I'd like to do is implement the following scenarios: When an image is dragged around, it does not automatically reorder other images in