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1. collectionView(_:layout:insetForSectionAt:) - Apple Developer
   Section insets are margins applied only to the items in the section. They represent the distance between the header view and the first line of items.
   https://developer.apple.com > uikit
2. UICollectionView spacing margins - Stack Overflow
   2012/12/20 -I have created the collectionview using UICollectionViewFlowLayout . It works good but I would like to have spacing on margins. Is it possible ...
   https://stackoverflow.com > questions
3. sectionInset | Apple Developer Documentation
   Section insets reflect the spacing at the outer edges of the section. The margins affect the initial position of the header view, the minimum space on either ...
   https://developer.apple.com > uikit > s...
4. Section Insets & Min Spacing of CollectionView - DEV Community
   2021/10/2 -1. First please go to storyboard again · Click "Collection View" · Go to Attributes inspector tab · Check Scroll direction as "Vertical". 2.
   https://dev.to > danieljang > section-in...
5. Custom UICollectionView Layouts — A sneak peak - Medium
   2019/10/23 -width → The width of the contents can be calculated by removing the collection view left and right insets from the width of the collection view.
   https://medium.com > custom-uicollec...
6. Getting Started with UI​Collection​View​Compositional​Layout
   2020/6/17 -UI Collection View Compositional Layout promised to simplify collection view layouts using a more declarative approach without the need to subclass to achieve ...
   https://lickability.com > blog > getting...
7. Lists in UICollectionView - WWDC20 - Videos - Apple Developer
   Learn how to build lists and sidebars in your app with UICollectionView. Replace table view appearance while taking advantage of the full flexibility of ...
   https://developer.apple.com > videos > play > wwdc2020
8. Inset is not working for SupplementaryView · Issue #800 - GitHub
   2017/5/28 -Section insets are applied to contents only in UICollectionViewFlowLayout. See Using the Flow Layout of the Apple official documentation for more details.
   https://github.com > IGListKit > issues
9. IGListCollectionViewLayout Class Reference
   Headers are always stretched to the width of the collection view, pinched with the section insets. Ex. of a section (2,0) with a header inset on the left/right.
   https://instagram.github.io > Classes
10. Using compositional collection view layouts in iOS 13 - Donny Wals
    2019/12/22 -There are two possible ways to give your collection view cells some room to breathe: Assign edge insets on the items, groups or sections. Assign ...
    https://www.donnywals.com > using-c...