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What is Chatto

Chatto is a Swift framework to ease the development of chat applications. At the UI level, it takes care of managing the UICollectionView where the messages are displayed and provides a placeholder for an input component.

Chatto features:

• Manages UICollectionView, taking care of calculating changes and performing updates.
• Placeholder for an input component at the bottom of the screen.
• Provides support for interactive dismissal of the keyboard and adjusts the insets automatically when it appears.
• Provides a default layout for the UICollectionView.
• Calculates this layout in a background queue (partially if your sizing routines can be only executed in the main thread).
• Triggers notifications to the data source to retrieve more messages (pagination)
• Encourages clean code by decoupling your message's presentation into different presenters

Learn more:

• BaseChatViewController
• Data source
• Presenters
• Decorator
• Update flow
• Diagram of classes (todo)

What is ChattoAdditions

ChattoAdditions is a companion framework for Chatto

ChattoAdditions features:

• BaseMessageCollectionViewCell: a base cell for chat messages, supporting a failed icon, an avatar, and a revealing timestamp. It is a generic container for the actual message (ViewT).
• TextMessageCollectionViewCell: a concrete subclass for text messages, supporting link detection
• PhotoMessageCollectionViewCell: a concrete subclass for photo messages, supporting transferring progress indicator.
• ChatInputBar: an extensible input bar to send text, photos and custom types of messages.

Learn more:

• BaseMessageCollectionViewCell (todo)
• BaseMessagePresenter (todo)
• ChatInputBar

Tutorials

• Setup BaseChatViewController as in ChattoApp
• Add a custom cell (from scratch)
• Add a new type of message (inheriting from BaseMessageCollectionViewCell) (todo)