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Convert SVG path data to a Swift 3 UIBezierPath

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As an iOS developer, you have to support at least three different pixel densities. Why waste your time managing a million image assets for different resolutions and states?

swiftvg is a small little tool written in javascript to help you convert your vector SVG images into UIBezierPath shapes. It provides both CLI and JS apis, so you can use it however you'd like.


There are two ways to use swiftvg: through the CLI or through your code.


To install the tool, use npm (or another npm package manager like yarn). It's recommended that you install it globally, have node_modules/.bin in your path, or use it with an npm run-script.

npm install -g swiftvg


To add swiftvg to your project, install it to your dependencies.

npm install -S swiftvg



After it's installed and avilable somewhere in your path, run the command with your svg data string.

Unless something went wrong, the command should exit with a 0 status and print the swift code line by line to your terminal's STDOUT.

swiftvg "M37,17 L37,25 Z"

# output
let shape = UIBezierPath()
shape.move(to: CGPoint(x: 37, y: 17))
shape.addLine(to: CGPoint(x: 37, y: 25))


After it's installed, require or import it into your code and run the exported function.

You can expect the function to return an array, where each element is a line of swift code. You can console.log(join(output, '\n')) or anything else you can imagine.

// CommonJS
const swiftvg = require("swiftvg");

// ES2015
import swiftvg from "swiftvg";

const pathData = "M37,17 L37,25 Z";

swiftvg(pathData); // Array<String>


As the project is pretty small, you only need to run npm install to get up and running. From there, standard is used for code style.

This is a functional project, so please try to keep it that way—avoid side affects, mutations, and imperative code when you can.

There are four testing commands:

npm run build:browser – build a UMD file for a browser to consume
npm run build:site – build the JS bundle for the public site
npm run test – run all tests
npm run test:coverage - get a coverage report
npm run test:lint – lint the project using standard
npm run test:unit – run only unit tests with no coverage or linting

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