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Five model classes in IGListDiffKit: `IGListBatchUpdateData`, `IGListIndexPathResult`, `IGListIndexSetResult`, `IGListMoveIndex`, and `IGListMoveIndexPath` didn't have 100% test coverage because their `description` debug string methods weren't being tested.

I added a new unit test file specifically for testing description strings in IGListDiffKit wrote a basic test to verify each one.

This brings IGListDiffKit's test coverage back up to 100%.

Differential Revision: D44002058

fbshipit-source-id: ebb1bbb3c9a6d380540fc6bbedf5b8c5e5b254f1

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August 31, 2021 19:28

Build Status Coverage Status Pods Version Platforms Carthage Compatible

A data-driven UICollectionView framework for building fast and flexible lists.

Main Features
🙅 Never call performBatchUpdates(_:, completion:) or reloadData() again
🏠 Better architecture with reusable cells and components
🔠 Create collections with multiple data types
🔑 Decoupled diffing algorithm
Fully unit tested
🔍 Customize your diffing behavior for your models
📱 Simply UICollectionView at its core
🚀 Extendable API
🐦 Written in Objective-C with full Swift interop support

IGListKit is built and maintained with ❤️ by Instagram engineering. We use the open source version main branch in the Instagram app.

Multilingual translation

Chinese README


  • Xcode 9.0+
  • iOS 9.0+
  • tvOS 9.0+
  • macOS 10.11+ (diffing algorithm components only)
  • Interoperability with Swift 3.0+



The preferred installation method is with CocoaPods. Add the following to your Podfile:

pod 'IGListKit', '~> 4.0.0'


For Carthage, add the following to your Cartfile:

github "Instagram/IGListKit" ~> 4.0.0

Swift Package Manager

For Swift Package Manager:

To integrate using Xcode:

File -> Swift Packages -> Add Package Dependency

Enter package URL:, and select the latest release.

For advanced usage, see our Installation Guide.

Getting Started

Try out IGListKit by opening any of the sample apps available in the Examples directory.


You can find the docs here. Documentation is generated with jazzy and hosted on GitHub-Pages.

To regenerate docs, run ./scripts/ from the root directory in the repo.


For the long-term goals and "vision" of IGListKit, please read our Vision doc.


Please see the CONTRIBUTING file for how to help. At Instagram, we sync the open source version of IGListKit daily, so we're always testing the latest changes. But that requires all changes be thoroughly tested and follow our style guide.

We have a set of starter tasks that are great for beginners to jump in on and start contributing.


IGListKit is MIT-licensed.

The files in the /Examples/ directory are licensed under a separate license as specified in each file. Documentation is licensed CC-BY-4.0.