How to implement guide with custom uicollectionviewlayout not rendering cells in objective-c
I'm trying to debug I'm maintaining legacy code that I'm trying to implement I'm working on a custom `UICollectionViewLayout` to achieve a staggered grid layout for my image gallery in an iOS app. However, when I try to set up the layout, the cells are not rendering correctly; they appear completely off-screen. I've overridden necessary methods like `layoutAttributesForElementsInRect:` and `layoutAttributesForItemAtIndexPath:` but need to seem to figure out what's wrong. I'm using Xcode 14.0 and targeting iOS 15.0. Here's a snippet of my `UICollectionViewLayout` implementation: ```objective-c - (NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect { NSMutableArray *attributesArray = [NSMutableArray array]; for (NSInteger i = 0; i < [self.collectionView numberOfItemsInSection:0]; i++) { NSIndexPath *indexPath = [NSIndexPath indexPathForItem:i inSection:0]; UICollectionViewLayoutAttributes *attributes = [self layoutAttributesForItemAtIndexPath:indexPath]; if (CGRectIntersectsRect(attributes.frame, rect)) { [attributesArray addObject:attributes]; } } return attributesArray; } - (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath { UICollectionViewLayoutAttributes *attributes = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath]; CGFloat width = (self.collectionView.bounds.size.width / 2) - 10; CGFloat height = 100 + arc4random_uniform(100); CGFloat x = (indexPath.item % 2) * (width + 10); CGFloat y = (indexPath.item / 2) * (height + 10); attributes.frame = CGRectMake(x, y, width, height); return attributes; } ``` I've also ensured the delegate and data source methods are implemented correctly in the view controller. When I run the app, I don't see any cells, and the `layoutAttributesForElementsInRect:` is returning an empty array. I suspect there might be an scenario with the frame calculations, but I need to pinpoint the question. I've tried logging the frames of the layout attributes and they seem correct based on my calculations. Has anyone encountered a similar scenario or have suggestions on how to debug this further? Any insights would be greatly appreciated! This is part of a larger application I'm building. This is my first time working with Objective-C 3.10. Cheers for any assistance! For reference, this is a production mobile app. Any advice would be much appreciated. Any pointers in the right direction?