一個基于Swift構建聊天應用的輕量級框架：Chatto

Chatto是一個Swift輕量級框架用于構建聊天應用。它被設計為可擴展和高性能。與Chatto一起的還有ChattoAdditions一個 companion 框架，它包括了消息氣泡，和一個可擴展的輸入組件。

特性

• Calculation of collection view changes and layout in background
• Supports pagination in both directions and autoloading
• Message count contention for fast pagination and rotation with thousands of messsages
• Accessory view revealing by swiping from right
• Interactive keyboard dismissal
• Text bubbles
• Photo bubbles
• Extensible input bar

如何使用

1. Subclass ChatViewController
2. OverridecreateChatInputView()to useChattoAdditions.ChatInputBaror provide your own component
3. Provide a data source with your messages
4. OverridecreatePresenterBuilders(). There will be a presenter for each message that will be responsible for the UI of that message.

override func createPresenterBuilders() -> [ChatItemType: [ChatItemPresenterBuilderProtocol]] {
    return [
        TextMessageModel.chatItemType: [
            TextMessagePresenterBuilder(
                viewModelBuilder: TextMessageViewModelDefaultBuilder(),
                interactionHandler: TextMessageHandler(baseHandler: self.baseMessageHandler)
            )
        ]
    ]
}

override func createChatInputView() -> UIView {
    let chatInputView = ChatInputBar.loadNib()
    self.configureChatInputBar(chatInputView)
    self.chatInputPresenter = ChatInputBarPresenter(chatInputView: chatInputView, chatInputItems: self.createChatInputItems())
    return chatInputView
}

override func viewDidLoad() {
    super.viewDidLoad()
    self.chatDataSource = self.myDataSource
}

項目主頁：http://www.baiduhome.net/lib/view/home/1448866193608