uicollectionviewlayout

UICollectionViewFlowLayout estimatedItemSize does not work properly with iOS12 though it works fine with iOS 11.*

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In my case, I solved this by explicitly adding the following constraints to the cell’s contentView. class Cell: UICollectionViewCell { // … override func awakeFromNib() { super.awakeFromNib() // Addresses a separate issue and prevent auto layout warnings due to the temporary width constraint in the xib. contentView.translatesAutoresizingMaskIntoConstraints = false // Code below is needed to … Read more

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

UICollectionView with a sticky header

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Simplest solution for iOS 9 + as it doesn’t need of writing subclass of UICollectionViewFlowLayout. In viewDidLoad of viewController with collectionView use following code: let layout = collectionView.collectionViewLayout as? UICollectionViewFlowLayout // casting is required because UICollectionViewLayout doesn’t offer header pin. Its feature of UICollectionViewFlowLayout layout?.sectionHeadersPinToVisibleBounds = true

UICollectionView Custom Cell to fill width In Swift

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You need to do this programatically. Implement UICollectionViewDelegateFlowLayout in your view controller and provide the size in collectionView:layout:sizeForItemAtIndexPath: func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize { let kWhateverHeightYouWant = 100 return CGSizeMake(collectionView.bounds.size.width, CGFloat(kWhateverHeightYouWant)) } You will also want to call collectionView.collectionViewLayout.invalidateLayout() inside your view controller’s viewWillLayoutSubviews() so that when the … Read more

Custom animation when switching from one UICollectionViewLayout to another?

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#define degreesToRadians(x) (M_PI * (x) / 180.0) UICollectionView *collectionView = self.viewController.collectionView; HorizontalCollectionViewLayout *horizontalLayout = [HorizontalCollectionViewLayout new]; NSTimeInterval duration = 2; [collectionView.visibleCells enumerateObjectsUsingBlock:^(UICollectionViewCell *cell, NSUInteger index, BOOL *stop) { CABasicAnimation *rotationAnimation; rotationAnimation = [CABasicAnimation animationWithKeyPath:@”transform.rotation”]; rotationAnimation.toValue = @(degreesToRadians(360)); rotationAnimation.duration = duration; rotationAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; [cell.layer addAnimation:rotationAnimation forKey:@”rotationAnimation”]; }]; [UIView animateWithDuration:duration animations:^ { collectionView.collectionViewLayout = horizontalLayout; … Read more

UICollectionView wrong contentSize on first load, correct after that

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So I was seeing a similar issue where contentSize width was always zero. The simple answer is…there is probably no content in the collectionView yet. That was why it’s content size is zero. I was also noticing that sometimes after calling invalidateLayout on my UICollectionView, I was seeing that self.collectionView.collectionViewLayout.collectionViewContentSize was not the same as … Read more

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