How do I handle keyboard appearance with ChatLayout?

ChatLayout does not provide keyboard handling; you must update UICollectionView's contentInsets manually or use a library like InputBarAccessoryView, as shown in the example app. This gives full control but requires extra implementation.

ChatLayout vs MessageKit: which is better for my project?

Choose ChatLayout for maximum customization and control over layout and animations; opt for MessageKit if you want an all-in-one solution with pre-built components and faster setup, but less flexibility.

Does ChatLayout support UICollectionViewDiffableDataSource?

Yes, ChatLayout can process updates from UICollectionViewDiffableDataSource, but you need to ensure correct command handling, as mentioned in the Todo section, to avoid animation issues.

How to implement sticky headers in ChatLayout?

ChatLayout supports pinned cells that behave like headers/footers; use the provided APIs to configure sticky cells, and refer to the documentation for implementation details.

What causes strange animations in ChatLayout and how to fix them?

Issues often stem from incorrect delete/insert commands in data updates; use diffing libraries like DifferenceKit carefully and debug commands in ChatLayout.prepare method, as advised in the README.

Can I use ChatLayout with Texture for better performance?

Yes, but it requires manual implementation of ChatLayoutDelegate to propagate node sizes, since Texture's default wrapper is hardcoded for UICollectionViewFlowLayout, as noted in the README.

Open-Awesome

ChatLayout

MITSwift2.4.2

A custom UICollectionViewLayout for building flexible, high-performance chat interfaces on iOS with full UIKit control.

GitHub

1.0k stars81 forks0 contributors

What is ChatLayout?

ChatLayout is a custom UICollectionViewLayout for iOS that enables developers to build highly customizable and performant chat interfaces. It solves the problem of rigid, opinionated chat UI frameworks by providing full control over presentation while maintaining compatibility with standard UIKit tools. Unlike wrappers or modified flow layouts, it acts as a pure layout engine that integrates seamlessly into existing iOS projects.

Target Audience

iOS developers building chat or messaging features who need fine-grained control over UI behavior and integration with their existing architecture. It's ideal for teams avoiding heavy dependencies or those requiring custom animations, dynamic cell sizing, or non-standard chat layouts.

Value Proposition

Developers choose ChatLayout because it offers the flexibility of a custom layout without sacrificing UIKit's native capabilities. Its minimal API surface and lack of enforced patterns allow for easier debugging, better performance tuning, and straightforward integration with diffing libraries or custom data models.

Overview

ChatLayout is an alternative solution to MessageKit. It uses custom UICollectionViewLayout to provide you full control over the presentation as well as all the tools available in UICollectionView. It supports dynamic cells and supplementary view sizes.

Use Cases

Best For

Building custom chat interfaces with unique bubble designs or layouts
Implementing agent/customer chat UIs with distinct visual modes
Integrating chat features into existing UIKit-based iOS apps
Creating performant messaging interfaces with smooth animations
Developing chat UIs that require sticky headers or footers
Projects needing full control over keyboard appearance and input handling

Not Ideal For

Projects needing a complete, out-of-the-box chat solution with built-in input controls and keyboard management
Teams looking for pre-styled chat bubbles and components to accelerate development without custom UIView work
Simple chat implementations where a standard UICollectionViewFlowLayout with minor adjustments would suffice
Apps prioritizing rapid prototyping over fine-grained control and customization

Pros & Cons

Pros

Dynamic Auto-Layout Sizing

Supports runtime size calculation with auto-layout constraints, eliminating the need for pre-calculation as emphasized in the README.

Smooth Animated Updates

Provides precise control over item insertion, deletion, reloading, and moving with animated transitions, ensuring fluid chat interactions.

Content Stability

Keeps the last visible message at the top or bottom during updates to prevent jarring jumps, a critical feature for chat UIs.

Flexible Integration

Does not enforce specific data models, view controllers, or input controls, allowing seamless use with existing UIKit workflows.

Built-in Agent Mode

Offers native support for agent/customer chat layouts with visual separation, useful for customer service applications.

Cons

No Built-in Input Handling

Lacks keyboard management and input controls, requiring developers to implement or integrate third-party libraries separately, increasing setup complexity.

Complex Debugging for Animations

Incorrect data update commands can cause unexpected animations, as warned in the README, necessitating careful debugging and potentially error-prone implementation.

Manual Integration for Advanced Use

Using with performance libraries like Texture requires custom implementation, as the default wrapper is incompatible, adding development overhead.

Limited Pre-built Components

Focuses solely on the layout engine, so developers must build or source chat bubbles, input bars, and other UI elements from scratch.

Open Source Alternative To

ChatLayout is an open-source alternative to the following products:

MessageKit

MessageKit is an open-source, community-driven UI framework for building messaging interfaces in iOS applications with customizable message bubbles and layouts.

Frequently Asked Questions

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ChatLayout

MITSwift2.4.2

A custom UICollectionViewLayout for building flexible, high-performance chat interfaces on iOS with full UIKit control.

GitHub

1.0k stars81 forks0 contributors

What is ChatLayout?

Target Audience

Value Proposition

Overview

Use Cases

Best For

Building custom chat interfaces with unique bubble designs or layouts
Implementing agent/customer chat UIs with distinct visual modes
Integrating chat features into existing UIKit-based iOS apps
Creating performant messaging interfaces with smooth animations
Developing chat UIs that require sticky headers or footers
Projects needing full control over keyboard appearance and input handling

Not Ideal For

Projects needing a complete, out-of-the-box chat solution with built-in input controls and keyboard management
Teams looking for pre-styled chat bubbles and components to accelerate development without custom UIView work
Simple chat implementations where a standard UICollectionViewFlowLayout with minor adjustments would suffice
Apps prioritizing rapid prototyping over fine-grained control and customization

Pros & Cons

Pros

Dynamic Auto-Layout Sizing

Supports runtime size calculation with auto-layout constraints, eliminating the need for pre-calculation as emphasized in the README.

Smooth Animated Updates

Provides precise control over item insertion, deletion, reloading, and moving with animated transitions, ensuring fluid chat interactions.

Content Stability

Keeps the last visible message at the top or bottom during updates to prevent jarring jumps, a critical feature for chat UIs.

Flexible Integration

Does not enforce specific data models, view controllers, or input controls, allowing seamless use with existing UIKit workflows.

Built-in Agent Mode

Offers native support for agent/customer chat layouts with visual separation, useful for customer service applications.

Cons

No Built-in Input Handling

Lacks keyboard management and input controls, requiring developers to implement or integrate third-party libraries separately, increasing setup complexity.

Complex Debugging for Animations

Incorrect data update commands can cause unexpected animations, as warned in the README, necessitating careful debugging and potentially error-prone implementation.

Manual Integration for Advanced Use

Using with performance libraries like Texture requires custom implementation, as the default wrapper is incompatible, adding development overhead.

Limited Pre-built Components

Focuses solely on the layout engine, so developers must build or source chat bubbles, input bars, and other UI elements from scratch.

Open Source Alternative To

ChatLayout is an open-source alternative to the following products:

MessageKit

MessageKit is an open-source, community-driven UI framework for building messaging interfaces in iOS applications with customizable message bubbles and layouts.