app-icon

Automatic icon resizing for Mobile Apps. Supports Native, Cordova and React Native. Also supports labelling of app icons. Inspired by cordova-icon.

• Introduction
• Installation
• Usage
  • Generating Icons
  • Labelling Icons
• Coding
  • Initial Setup
  • Running Tests
  • Creating a Release
• The Sample Projects
• Troubleshooting
• License

Introduction

This simple tool allows you to create a single icon in your app project, then create icons of all required sizes from it. It currently works for iOS and Android. You can also add labels to your app icons.

Installation

Install with:

npm install -g app-icon

You will need imagemagick installed:

brew install imagemagick          # OSX
sudo apt-get install imagemagick  # Debian/Ubuntu/etc
sudo yum install imagemagick      # CentOS/etc

Usage

The commandline tool can be used to generate icons or label icons.

Generating Icons

Add an icon (ideally at least 192x192 pixels) named icon.png to your project root. To automatically generate icons of all sizes for all app projects in the same folder, run:

app-icon generate

If an iOS project is present, then the icon will be copied at all required sizes to:

./ios/<ProjectName>/Images.xcassets/AppIcon.appiconset

If an Android project is present, then the icon will be copied at all required sizes to:

./android/app/src/main/res

You can limit the platforms which icons are generated for with the --platforms flag, specifying:

app-icon generate --platforms=ios
app-icon generate --platforms=android,ios

By default the tool will generate icons for both platforms.

You can specify the path to the source icon, as well as the folder to search for app projects, just run app-icon generate -h to see the options.

Labelling Icons

Add labels to an icon with the command below:

app-icon label -i icon.png -o output.png --top UAT --bottom 0.12.3

This would produce output like the below image:

This is a useful trick when you are creating things like internal QA versions of your app, where you might want to show a version number or other label in the icon itself.

Coding

The only dependencies are Node 6 (or above) and Yarn.

Useful commands for development are:

Command	Usage
npm test	Runs the unit tests.
npm run test:debug	Runs the tests in a debugger. Combine with .only and debugger for ease of debugging.
npm run cov	Runs the tests, writing coverage reports to ./artifacts/coverage.

Currently the linting style is based on airbnb. Run npm run lint to lint the code.

Initial Setup

Install the dependencies (I recommend Node Version Manager):

nvm install 6
nvm use 6
npm install -g yarn
git clone git@github.com:dwmkerr/app-icon.git
cd app-icon
yarn

Running Tests

Run the tests with:

npm test

Tests are executed with Mocha and coverage is handled by Istanbul. Coverage reports are written to an ./artifacts folder.

Creating a Release

To create a release.

• Merge your work to master.
• Use npm version to bump, e.g. npm version patch
• Push and deploy git push --tags && git push && npm publish

The Sample Projects

This project includes some sample apps in the test folder, which are used for the tests. You can also run these apps to see the icons produced in action.

React Native

To run:

cd ./test/ReactNativeIconTest/
npm install
react-native run-ios
# OR react-native run-android

Cordova

To run:

cd ./test/CordovaApp/
npm install
cordova run ios
# OR cordova run android

Native

To run the native apps, open the ./test/NativeApp directory, then open the iOS/Android projects in XCode/AndroidStudio as needed.

Troubleshooting

Images labelled with app-icon label have the text slightly vertically offset

This seems to be an issue with Imagemagick 6 - try upgrading to 7.

License

MIT