uicollectionviewlayout

Warning: UICollectionViewFlowLayout has cached frame mismatch for index path ‘abc’

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This is likely occurring because the flow layout “xyz” is modifying attributes returned by UICollectionViewFlowLayout without copying them And sure enough, that’s just what you are doing: private override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes? { let attributes = super.layoutAttributesForItemAtIndexPath(indexPath) let distance = CGRectGetMidX(attributes!.frame) – self.midX; var transform = CATransform3DIdentity; transform = CATransform3DTranslate(transform, -distance, 0, -self.width); … Read more

iOS 10 bug: UICollectionView received layout attributes for a cell with an index path that does not exist

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This happened to me when number of cells in collectionView changed. Turns out I was missing invalidateLayout after calling reloadData. After adding it, I haven’t experienced any more crashes. Apple has made some modifications to collectionViews in iOS10. I guess that’s the reason why we are not experiencing same problem on older versions. Here’s my … Read more

UICollectionView – Horizontal scroll, horizontal layout?

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Have you tried setting the scroll direction of your UICollectionViewFlowLayout to horizontal? [yourFlowLayout setScrollDirection:UICollectionViewScrollDirectionHorizontal]; And if you want it to page like springboard does, you’ll need to enable paging on your collection view like so: [yourCollectionView setPagingEnabled:YES];

How to create a centered UICollectionView like in Spotify’s Player

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In order to create an horizontal carousel layout, you’ll have to subclass UICollectionViewFlowLayout then override targetContentOffset(forProposedContentOffset:withScrollingVelocity:), layoutAttributesForElements(in:) and shouldInvalidateLayout(forBoundsChange:). The following Swift 5 / iOS 12.2 complete code shows how to implement them. CollectionViewController.swift import UIKit class CollectionViewController: UICollectionViewController { let collectionDataSource = CollectionDataSource() let flowLayout = ZoomAndSnapFlowLayout() override func viewDidLoad() { super.viewDidLoad() title = … Read more

UICollectionView Layout like SnapChat?

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Based on a precedent answer adapted to your issue: -(id)initWithSize:(CGSize)size { self = [super init]; if (self) { _unitSize = CGSizeMake(size.width/2,80); _cellLayouts = [[NSMutableDictionary alloc] init]; } return self; } -(void)prepareLayout { for (NSInteger aSection = 0; aSection < [[self collectionView] numberOfSections]; aSection++) { //Create Cells Frames for (NSInteger aRow = 0; aRow < [[self … Read more

How to set cell spacing and UICollectionView – UICollectionViewFlowLayout size ratio?

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Add these 2 lines layout.minimumInteritemSpacing = 0 layout.minimumLineSpacing = 0 So you have: // Do any additional setup after loading the view, typically from a nib. let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout() layout.sectionInset = UIEdgeInsets(top: 20, left: 0, bottom: 10, right: 0) layout.itemSize = CGSize(width: screenWidth/3, height: screenWidth/3) layout.minimumInteritemSpacing = 0 layout.minimumLineSpacing = 0 collectionView!.collectionViewLayout = … Read more

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