IGListKit is a data-driven UICollectionView framework for building fast and flexible lists in iOS applications.
The framework solves the problem of managing complex, dynamic list updates in UICollectionView by eliminating the need to manually call performBatchUpdates or reloadData. It uses a decoupled diffing algorithm to automatically compute and apply changes to collection views based on data model updates. The architecture separates concerns through reusable cells and components, allowing developers to build collections containing multiple data types without tight coupling between data and presentation logic.
Developers should choose IGListKit when building list-based interfaces that require frequent updates or contain heterogeneous content types. It suits projects where maintainability and performance are priorities, particularly those with complex feed-like layouts similar to Instagram's own use case. The framework is written in Objective-C with full Swift interoperability, making it accessible to teams using either language. It works across iOS, tvOS, and macOS platforms, with the diffing algorithm components available on macOS even without full UICollectionView support.
The project is actively maintained and used in the Instagram app itself. Development includes comprehensive unit test coverage and a documented, extensible API that allows customization of diffing behavior for specific model types. The framework provides example projects and getting started guides to support adoption, and the codebase demonstrates production-grade engineering practices suitable for large-scale applications.
