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A Swift client library for generating URLs with imgix

imgix logo

imgix-swift is a client library for generating image URLs with imgix. Written in Swift, but can be used with Objective-C codebases as well.

CocoaPods Carthage compatible Build Status Supported Platforms License


// add the following to your Package.swift manifest, within the dependencies array

.package(url: "https://github.com/imgix/imgix-swift.git", from: "1.0.0")

// add the package name "ImgixSwift" to the list of named dependencies in your project target

    name: "YourSwiftProject",
    dependencies: ["ImgixSwift"]),

As of version 1.0.0 imgix Swift client is compatible with Swift 5.0.

The latest version compatible with Swift 4.0 is 0.4.3.

The latest version compatible with Swift 3.0 is 0.3.0.



// Import the framework
import ImgixSwift

// Set up an ImgixClient
let client = ImgixClient.init(host: "assets.imgix.net")

// Build a basic URL
client.buildUrl("dog.jpg") // => https://assets.imgix.net/dog.jpg

// Add some parameters
client.buildUrl("dog.jpg", params: [
  "w": 300,
  "h": 300,
  "fit": "crop"
]) // => https://assets.imgix.net/dog.jpg?fit=crop&h=300&w=300


If your project doesn't contain any other Swift code, make sure to set your target's Build Settings > Build Options > Embedded Content Contains Swift Code to YES.

// Import the framework
#import <ImgixSwift/ImgixSwift.h>

// Set up an ImgixClient
ImgixClient *client = [[ImgixClient alloc] initWithHost:@"assets.imgix.net"];

// Build a basic URL
[client buildUrl:@"dog.jpg"]; // => https://assets.imgix.net/dog.jpg

// Add some parameters
[client buildUrl:@"dog.jpg", params:@{
  @"w": @300,
  @"h": @300,
  @"fit": @"crop",
}]; // => https://assets.imgix.net/dog.jpg?fit=crop&h=300&w=300

Advanced Usage

Automatic Signing

If you're using a source that requires signed URLs, imgix-swift can automatically build and sign them for you.

let signedClient = ImgixClient.init(
  host: "imgix-library-secure-test-source.imgix.net",
  secureUrlToken: "EHFQXiZhxP4wA2c4"

signedClient.buildUrl("dog.jpg", params: [
  "bri": 50
]) // => https://imgix-library-secure-test-source.imgix.net/dog.jpg?bri=50&s=3b293930d9c288fb788657fd9ed8164f

Automatic Base64 Encoding

imgix-swift will automatically Base64-encode any parameter key ending in 64, according to the requirements of imgix's Base64 variant parameters.

let client = ImgixClient.init(host: "assets.imgix.net")

client.buildUrl("dog.jpg", params: [
  "w": 640,
  "txt64": "🐶 Puppy!",
  "txtfont64": "Avenir Next Demi,Bold",
  "txtalign": "center,top",
  "txtpad": 50,
  "txtshad": 10,
  "txtclr": "fff",
  "txtfit": "max",
  "txtsize": 50
]) // => https://assets.imgix.net/dog.jpg?txt64=8J-QtiBQdXBweSE&txtalign=center%2Ctop&txtclr=fff&txtfit=max&txtfont64=QXZlbmlyIE5leHQgRGVtaSxCb2xk&txtpad=50&txtshad=10&txtsize=50&w=640

URL Reconstruction

You can reconstruct existing URLs by using the ImgixClient#reconstruct method. Existing parameters on the input URL will be merged and/or overridden by passed params.

let client = ImgixClient.init(host: "assets.imgix.net")
let inputUrl = URL.init(string: "https://paulstraw.imgix.net/pika.jpg?w=300")!

client.reconstruct(originalURL: inputUrl, params: [
  "h": 300,
  "fit": "crop"
]) // => https://paulstraw.imgix.net/pika.jpg?fit=crop&h=300&w=300

What is the ixlib param

For security and diagnostic purposes, we default to signing all requests with the language and version of library used to generate the URL. This can be disabled by setting client.includeLibraryParam = false.


Stars: 20
Last commit: 1 week ago


1.1.2 - 2020-06-18T18:42:09

  • fix: percent-encode any invalid characters in URL path (adb8694)