Possibly related to #11

If using estimated item sizes:

layout.estimatedItemSize = CGSizeMake(50, 50);

in combination with UICollectionViewCell override of:

- (UICollectionViewLayoutAttributes *)preferredLayoutAttributesFittingAttributes:(UICollectionViewLayoutAttributes *)layoutAttributes {
    CGFloat randomWidth = (arc4random() % 120) + 60;
    layoutAttributes.size = CGSizeMake(randomWidth, 60);
    return layoutAttributes;
}

Application will fall into recursive loop.

When I applied the layout to a collectionView with section headers, the headers except the first one were not correctly positioned. It seemed that the origin of the headers were the same as that of the first row of cells in the same section. Any suggestion? Is it a bug, or have I miss anything? Thx

still digging, don`t know why

sorry ,Is my personal reasons, resolved now，thanks.

This is odd. I've been using this in a project for quite a while and it was working fine. I recently did a new build and now the collection view I'm using this for doesn't show any items. In the debugger I can see that numberOfItemsInSection is returning the correct (> 0) number -- but cellForItemAtIndexPath is never getting called.

I tried switching to the cocoapod and updating to the latest -- same thing.

Anyone else seeing this? Any thoughts?

Additional info -- I've been using estimatedItemSize and a cell w/ autolayout.

If I comment out the estimatedItemSize assignment, the cells appear (but are all sized the same).

Thanks
John

I'd love to know how you are using UICollectionViewLeftAlignedLayout, please leave a comment here with a link to the app, and/or a screenshot.

Thanks 😄

po 0x79e6eb30
ProductSuitColletCell: 0x79e6eb30; baseClass = UICollectionViewCell; frame = (0 0; 171 185);

(lldb) po 0x7c97f6e0
ProductSuitColletCell: 0x7c97f6e0; baseClass = UICollectionViewCell; frame = (0 0; 171 185);

you can see the two cell's frame is same

Hello...I have used this by downloading the files and set Class to UICollectionViewLeftAlignedLayout but at first time it gets stuck while scrolling and then scrolls properly...So please help me with this issue...

The framework crashes if supplemenatary footer views are added.

iOS 11.4 return UIEdgeInsetsMake(10, 10 10, 10); Right constraint invalid
iOS 14.4 normal display

• (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
  return UIEdgeInsetsMake(10, 10 10, 10);
  }

If there are 2000 data, sliding up and down, only in demo, kartun will not quit, in the project will be kartun and quit, because memory problems exit

如果有2000个数据，上下滑动，只有在demo中卡顿不会退出，在项目中会卡顿和退出，因为内存问题退出。

Hello,
At WWDC23 Apple is requiring all api calls that fall under this ruleset https://developer.apple.com/documentation/bundleresources/privacy_manifest_files/describing_use_of_required_reason_api#4278394
be added to a privacy manifest file.

Thank you!!!

When i used the code : self.collectionView.collectionViewContentSize.height , my app crashed with the log *** -[_UIFlowLayoutItem setSizeEstimated:]: message sent to deallocated instance 0x138f6f850 .I don't know why

A Swift 3 port of this would be great.

I am getting a crash when using UICollectionViewLeftAlignedLayout on line 47. This only occurs if I set estimatedItemSize to use dynamic sizing.

NSArray *originalAttributes = [super layoutAttributesForElementsInRect:rect];

Do you have time to help me get that going?

Maybe a google hangouts or something.

//notice: fixed accuracy value problem
previousFrame.origin.y = floor(previousFrame.origin.y);

Hey,

First of all, thank you for awesome library! I noticed that the latest tag is 1.0.3 which added Swift 4 support but the podspec is still pointing to 1.0.2.

当我有一个section的cell的宽度都为屏幕宽度的时候,这个section的cell就会错乱

UICollectionViewLeftAlignedLayout *layout = (UICollectionViewLeftAlignedLayout *)self.collectionViewLayout;
layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;

one section, some row in collectionview

hey there, first of all nice pod :)

It's working for me, but I get this warning. Any clues?

UICollectionViewFlowLayout has cached frame mismatch for index path <NSIndexPath: 0xc000000000200016> {length = 2, path = 0 - 1} - cached value: {{179, 0}, {136.33333333333334, 30}}; expected value: {{217.66666666666666, 0}, {136.33333333333334, 30}}

This is likely occurring because the flow layout subclass UICollectionViewLeftAlignedLayout is modifying attributes returned by UICollectionViewFlowLayout without copying them