collectionview – Tarik Billa

How do you set the duration for UICollectionView Animations?

June 13, 2023 by Tarik

To solve problem without hack that was proposed in the answer by gavrix you could subclass UICollectionViewLayoutAttributes with new property CABasicAnimation *transformAnimation, than create custom transformation with a suitable duration and assign it to attributes in initialLayoutAttributesForAppearingItemAtIndexPath, then in UICollectionViewCell apply the attributes as needed: @interface AnimationCollectionViewLayoutAttributes : UICollectionViewLayoutAttributes @property (nonatomic, strong) CABasicAnimation *transformAnimation; @end … Read more

Is force cast really bad and should always avoid it?

May 11, 2023 by Tarik

This question is probably opinion based, so take my answer with a grain of salt, but I wouldn’t say that force downcast is always bad; you just need to consider the semantics and how that applies in a given situation. as! SomeClass is a contract, it basically says “I guarantee that this thing is an … Read more

SwiftUI | Using onDrag and onDrop to reorder Items within one single LazyGrid?

May 5, 2023 by Tarik

SwiftUI 2.0 Here is completed simple demo of possible approach (did not tune it much, `cause code growing fast as for demo). Important points are: a) reordering does not suppose waiting for drop, so should be tracked on the fly; b) to avoid dances with coordinates it is more simple to handle drop by grid … Read more

UIWindow endDisablingInterfaceAutorotationAnimated error appears in console when keyboard is dismissed interactively from collectionView in iOS9 only

March 18, 2023 by Tarik

I had the same problem on iOS9 but with a tableView. I implemented this along with self.tableView.keyboardDismissMode = .Interactive and it worked for me. // Dismiss keyboard when scrolling func scrollViewWillBeginDragging(scrollView: UIScrollView) { textView.resignFirstResponder() }

iOS UICollectionView prototype cell size property ignored

March 11, 2023 by Tarik

The size of the cell in the storyboard editor is just to help you design the cell. Since each prototype cell can be a different size, UICollectionView doesn’t know which cell’s size to pick for all the cells. That’s why you set the actual size you want to use for your cells separately. You can … Read more

Where do I get a thread-safe CollectionView?

March 1, 2023 by Tarik

Use: System.Windows.Application.Current.Dispatcher.Invoke( System.Windows.Threading.DispatcherPriority.Normal, (Action)delegate() { // Your Action Code });

How can I add multiple collection views in a UIViewController in Swift?

February 21, 2023 by Tarik

This is possible, you just need to add each UICollectionView as a subview, and set the delegate and dataSource to your UIViewController. Here’s a quick example. Assuming you have one UICollectionView working, you should be able to adapt this code to your own uses to add a second fairly easily: let collectionViewA = UICollectionView() let … Read more