Reusable UI interfaces to ease building of Matrix client apps





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Apache License, Version 2.0




While MatrixSDK <>_ provides an Objective-C API to use the Matrix Client-Server API, MatrixKit provides a higher level, reusable and easy-customisable UI built on top of the SDK.

Put simply, MatrixKit is a set of ViewControllers and Views. An app developer can pick up UI components from this set and insert them into their application storyboard or code. The end application controls what is shown when.

Each of the provided UI components has been designed to run standalone. There are no dependencies between them.

The currently available view controllers are:

  • MXKRoomViewController: shows messages of a room and allows user to chat
  • MXKRecentListViewController: displays the user's rooms ordered by last activity
  • MXKRoomMemberListViewController: a page showing the list of a room's members

Coming soon:

  • Authentication views
  • Public rooms: the list of public rooms
  • Room creation
  • Address book


Here are two samples for displaying messages of a room:

.. image:: :width: 240px :align: left :target:

.. image:: :width: 240px :align: right :target:

The left one is the stock room view controller. This is the one used by Console <> (GitHub <>).

The right one is an override of JSQMessagesViewController <>_. The display is fully managed by JSQMessagesViewController but the implementation uses data computed by MatrixKit components: MXKRoomDataSource & MXKRoomBubbleCellData. See the next session for definition of DataSource and celldata.


All view controllers in MatrixKit that display a list of items share the same ecosystem based on 4 components:

ViewController The ViewController is responsible for managing the display and user actions.

DataSource Provides the ViewController with items (CellView objects) to display. More accurately, the DataSource gets data (mainly Matrix events) from the Matrix SDK. It asks CellData objects to process the data into human readable text and store it. Then, when the ViewController asks for a cellview, it renders the corresponding CellData into a cellview that it returns.

For convenience, DataSources provided in MatrixKit implement UITableViewDataSource and UICollectionViewDataSource protocols so that UITableView and UICollectionView DataSources can be directly plugged to them.

CellData Contains data the CellView must display. There is one CellData object per item in the list. This is also a kind of cache to avoid displayed data needing to be computed everytime.

CellView This is an abstract object. It is often a UITableViewCellView or a UICollectionViewCell but can be any UIView. This is the view for an item displayed by the ViewController.

How to use it in your app


You can embed MatrixKit to your application project with CocoaPods. The pod for the latest MatrixKit release is::

pod 'MatrixKit'

Use case #1: Display a screen to chat in a room

Suppose you have a MXSession instance stored in mxSession (you can learn how to get in the Matrix SDK tutorials here <>_ ) and you want to chat in which room id is !

You will have to instantiate a MXKRoomViewController and attach a MXKRoomDataSource object to it. This object that will manage the room data. This is done with the following code::

    // Create a data souce for managing data for the targeted room
    MXKRoomDataSource *roomDataSource = [[MXKRoomDataSource alloc] initWithRoomId:@"!" andMatrixSession:mxSession];

    // Create the room view controller that will display it
    MXKRoomViewController *roomViewController = [[MXKRoomViewController alloc] init];
    [roomViewController displayRoom:roomDataSource];

Then, your app presents roomViewController. Your end user is now able to post messages or images to the room, navigate in the history, etc.

Use case #2: Display list of user's rooms

The approach is similar to the previous use case. You need to create a data source and pass it to the view controller::

    // Create a data source for managing data
    MXKRecentsDataSource *recentsDataSource = [[MXKRecentsDataSource alloc] initWithMatrixSession:mxSession];

    // Create the view controller that will display it
    MXKRecentListViewController *recentListViewController = [[MXKRecentListViewController alloc] init];
    [recentListViewController displayList:recentsDataSource];


The kit has been designed so that developers can make customisations at different levels, which are:

ViewController The provided ViewControllers can be subclassed in order to customise the following points:

  • the CellView class used by the DataSource to render CellData.
  • the layout of the table or the collection view.
  • the interactions with the end user.

CellView The developer may override MatrixKit CellViews to completely change the way items are displayed. Note that CellView classes must be conformed to the MXKCellRendering protocol.

CellData The developer can implement his own CellData classes in order to prepare differently rendered data. Note that the use of customised CellData classes is handled at DataSource level (see registerCellDataClass method).

DataSource This object gets the data from the Matrix SDK and serves it to the view controller via CellView and CellData objects. You can override the default DataSource to have a different behaviour.

Customisation example

Use case #1: Change cells in the room chat

This use case shows how to make cellView customisation.

A room chat is basically a list of items where each item represents a message (or a set of messages if they are grouped by sender). In the code, these items are inherit from MXKTableViewCell. If you are not happy with the default ones used by MXKRoomViewController and MXKRoomDataSource, you can change them by overriding MXKDataSourceDelegate methods in your view controller::

- (Class<MXKCellRendering>)cellViewClassForCellData:(MXKCellData*)cellData
   // Let `MyOwnBubbleTableViewCell` class manage the display of message cells
   // This class must inherit from UITableViewCell and must conform the `MXKCellRendering` protocol
   return MyOwnBubbleTableViewCell.class;

- (NSString *)cellReuseIdentifierForCellData:(MXKCellData*)cellData
    // Return the `MyOwnBubbleTableViewCell` cell identifier.
    return @"MyOwnBubbleTableViewCellIdentifier";

You may return a cellView class by taking into account the provided cell data. For example you can define different classes for received and sent messages.


If you want to help to improve MatrixKit by adding new ViewControllers, new views, new CellViews or other improvements, this git repository contains a sample Xcode project for demoing all reusable UI. Please hack on the develop branch and make git pull requests from it.

As its dependencies are based on CocoaPods, you will need to run pod install before opening MatrixKit.xcworkspace.


The filled icons play, pause, minus, back and keyboard are taken from icons8:

Copyright & License

Copyright (c) 2014-2017 OpenMarket Ltd Copyright (c) 2017 Vector Creations Ltd Copyright (c) 2017-2018 New Vector Ltd

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this work except in compliance with the License. You may obtain a copy of the License in the LICENSE file, or at:

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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