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Uniswap Wallet

Uniswap Wallet is the simplest, safest, and most powerful self-custodial crypto wallet. It is developed by the Uniswap Labs team, inventors of the Uniswap Protocol.

If you have suggestions on how we can improve the app, or would like to report a bug or a problem, check out the Uniswap Help Center.

Setup

Requirements

This guide assumes that:

  • You are using a Mac (you will need a Mac computer in order to run the Xcode iOS Simulator)
  • You are using an Apple Silicon Mac (if you’re not sure, go to  → About this Mac and check if the chip name starts with "Apple")

Note: if you are indeed using an Apple Silicon Mac, we recommend setting up your environment without using Rosetta. Some instructions on how to do that can be found here.

Packages and Software

Xcode

You should start with downloading Xcode if you don't already have it installed, since the file is so large. You can find it here: developer.apple.com/xcode

You must use XCode 15 to compile the app.

Homebrew

We’ll be using Homebrew to install many of the other required tools through the command line.

  1. Open a terminal
  2. Copy and paste the command from brew.sh into your terminal and run it

nvm

nvm is the Node Version Manager. While not required, it makes it easy to install Node and switch between different versions. A minimum Node version of 18 is required to use this repository.

Copy the curl command listed under Install & Update Script on this page and run it in your terminal.

To make sure nvm installed correctly, try running nvm -v (you may need to quit and re-open the terminal window). It should return a version number. If it returns something like zsh: command not found: nvm, it hasn’t been installed correctly.

node

Now we want to use nvm to install a specific version of node.

Run the following command in your terminal: nvm install 18

and then when it’s finished, run: nvm use 18

Quit and re-open the terminal, and then run: node -v

to make sure you get a version number that starts with v18..

yarn

We use yarn as our package manager and to run scripts.

Run the following command to install it: npm install --global yarn (npm comes with node, so it should work if the above step has been completed correctly)

Then run: yarn -v to see if it installed correctly.

Ruby

Use rbenv to install a specific version of ruby: brew install rbenv ruby-build

Run rbenv init and follow the instructions to complete the installation.

After following the instructions, make sure you source your .zshrc or .bash_profile, or start a new terminal session.

Install a version of ruby: rbenv install 3.2.2

Set this as your default version: rbenv global 3.2.2

Install cocoapods and fastlane using bundler (make sure to run in mobile) bundle install

Add Xcode Command Line Tools

Open Xcode and go to:

Preferences → Locations → Command Line Tools

And select the version that pops up.

JDK (Android)

Taken from RN instructions

brew tap homebrew/cask-versions
brew install --cask zulu17

# Get path to where cask was installed to double-click installer
brew info --cask zulu17

Add the following to your .rc file export JAVA_HOME=/Library/Java/JavaVirtualMachines/zulu-17.jdk/Contents/Home

Android Studio

Install Android Studio

Add the following to your .rc file

export ANDROID_HOME=$HOME/Library/Android/sdk
export PATH=$PATH:$ANDROID_HOME/emulator
export PATH=$PATH:$ANDROID_HOME/platform-tools

Android Studio should have an emulator already, but if not: Open the project at universe/apps/mobile/android Tools -> Device Manager to create a new emulator

Development

Once all the setup steps above are completed, you're ready to try running the app locally!

Environment variables

Note: The app will likely have limited functionality when running it locally with the default environment variables.

Use the environment variables defined in the .env.defaults.local file to run the app locally.

Compile contract ABI types

This is done in bootstrap but good to know about. Before the code will compile you need to generate types for the smart contracts the wallet interacts with. Run yarn g:prepare at the top level. Re-run this if the ABIs are ever changed.

Run the app

In the root directory, run yarn to install all the necessary npm packages.

Then run yarn mobile pod to install all the necessary pods. (You may need to updated source repos with pod repo update if this fails.)

Finally, run yarn mobile ios to boot up the iOS Simulator and run the app inside it. The JS bundler (metro) should automatically open in a new terminal window. If it does not, start it manually with yarn start.

Or you can use one command to run them all one after the other: yarn && yarn pod && yarn ios

You can also run the app from Xcode, which is necessary for any Swift related changes. Xcode will automatically start the metro bundler.

Hopefully you now (after a few minutes) see the Uniswap Wallet running in the iOS Simulator!

Enabling Flipper

We do not check Flipper into source. To prevent pod install from adding Flipper, set an environment variable in your .bash_profile or .zshrc or .zprofile:

# To enable flipper inclusion (optional)
export USE_FLIPPER=1

Note: To disable Flipper, the whole line should be commented out, as setting this value to 0 will not disable Flipper.

Important Libraries and Tools

These are some tools you might want to familiarize yourself with to understand the codebase better and how different aspects of it work.

Migrations

We use redux-persist to persist Redux state between user sessions. When the Redux state schema is altered, a migration may be needed to transfer the existing persisted state to the new Redux schema. Failing to define a migration results in the app defaulting to the persisted schema, which will very likely cause undefined errors because the code has references to Redux state properties that were dropped in favor the the persisted schema.

When to define a migration

Anytime a required property is added or any property is renamed or deleted to/from Redux state. Migrations are not necessary when optional properties are added to an existing slice. Make sure to always add new required properties to the schema.ts file as well.

How to migrate

  1. Increment the version of persistConfig defined within store.ts
  2. Create a migration function within migrations.ts. The migration key should be the same as the version defined in the previous step
  3. Write a test for your migration within migrations.test.ts
  4. Create a new schema within schema.ts and ensure it is being exported by the getSchema function at the bottom of the file

Troubleshooting

Common issues

  • zsh: command not found: [package name] This means whichever package you're trying to run ([package name]) wasn’t correctly installed, or your Terminal can’t figure out how to run it. If you just installed it, try quitting terminal and re-opening it. Otherwise try reinstalling the package.

  • unable to open file (in target "OneSignalNotificationServiceExtension" in project "Uniswap"). Resolve this issue by navigating to the ios/ directory and running pod update.

Common fixes

If something isn’t working the way it should or you’re getting a weird error when trying to run the app, try the following:

  1. Quit the terminal
  2. Quit Metro terminal
  3. Open Finder and navigate to the mobile directory
  4. Delete the node_modules folder
  5. Navigate into the ios folder
  6. Delete the Pods folder
  7. Open XCode
  8. Go to Product → Clean Build Folder
  9. Open your terminal again
  10. Navigate to the mobile directory in the terminal
  11. Run yarn && yarn pod again
  12. Run yarn ios

Shell profile setup

Your shell profile file is most likely one of: .bash_profile, .zshrc, or .zprofile, and will be located in /Users/[username]/. You can reveal hidden files in Finder by pressing ⌘ + Shift + ..

If issues with your terminal or shell seem to be the cause of some of your problems, here is an example of what that file may look like in order for your terminal to be able to run the app locally:

eval "$(/opt/homebrew/bin/brew shellenv)"

export NVM_DIR="$HOME/.nvm"
[ -s "/opt/homebrew/opt/nvm/nvm.sh" ] && \. "/opt/homebrew/opt/nvm/nvm.sh"  # This loads nvm
[ -s "/opt/homebrew/opt/nvm/etc/bash_completion.d/nvm" ] && \. "/opt/homebrew/opt/nvm/etc/bash_completion.d/nvm"  # This loads nvm bash_completion

# To enable flipper inclusion (optional)
export USE_FLIPPER=1
export PATH="/opt/homebrew/opt/ruby/bin:$PATH"