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A simple, performant, and lightweight SVG parser

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Key Features

  • Parsing performance that meets or beats other popular SVG Frameworks
  • A simple architecture, optimized for extension, flexibility and developer joy
  • Multiple interface options (UIBezierPath, CAShapeLayer, UIView, and IBDesignable Interface Builder subclass)
  • A minimal cache for improved performance
  • Tested and documented

Who Should Use SwiftSVG

SwiftSVG is not meant to be a a full SVG parser. The library supports the most common use cases of flat, solid color SVG elements. It supports grouping and transformations and can parse all path and shape elements.

The best use case for SwiftSVG is for flat icons that you may want to theme at runtime and have good control over. Think icons for your app, especially if you offer light and dark themes. The library can handle complex paths, and more importantly can handle them quickly, so you can use it to display many SVGs, just not every single use case. See the complex example in the examples app.

At this time, gradients are not supported, but this is high on the list of features to support next. Furthermore, text is not supported at this time, but shouldn't be too difficult to support. Animations are the last major category that isn't supported, and they probably won't be in the near future seeing Cocoa already provides rich support.

Finally, if you're looking to extend this project, that's another good reason to use SwiftSVG. A lot of work has been put into making the code as extensible and maintainable as possible and will continue to be a core feature of future updates. Fork the project and I hope you share your changes.

Table of Contents

Install

Swift version SwiftSVG version
Swift 5.0 v2.3.0
Swift 4.2 v2.2.1

Cocoapods:

pod 'SwiftSVG', '~> 2.0'

or Carthage:

github "mchoe/SwiftSVG" ~> 2.0

For projects currently using 1.x: SwiftSVG 2.x is a major rewrite of the library. For most use cases, you should be able to upgrade to 2.0 with little to no changes to your code. However, there are breaking changes that may affect your project. Most notably, the String extensions and the ability to parse single path string from a URL are deprecated.

Usage

UIView+SVG

The easiest way to create an SVG image is to use the UIView extension:

let fistBump = UIView(SVGNamed: "fistbump")     // In the main bundle
self.addSubview(fistBump)

Output:

Put it here!

Or you can add an SVG file to your Asset Catalog. You should add it as a Data Asset like this:

Add a new Data Asset in your Asset Catalog

Then use the same initializer as above:

let cowboyHat = UIView(SVGNamed: "cowboyHat")     // In the asset catalog as a Data Asset
self.addSubview(cowboyHat)

Output:

New York City.

You can also create a new UIView from a remote URL:

let svgURL = URL(string: "https://openclipart.org/download/181651/manhammock.svg")!
let hammock = UIView(SVGURL: svgURL) { (svgLayer) in
    svgLayer.fillColor = UIColor(red:0.52, green:0.16, blue:0.32, alpha:1.00).cgColor
    svgLayer.resizeToFit(self.view.bounds)
}
self.view.addSubview(hammock)

Output:

This is not a man in a hammock

SwiftSVG provides the following UIView convenience initializers:

convenience init(SVGNamed: String, parser: SVGParser? = nil, completion: ((SVGLayer) -> ())? = nil)
convenience init(SVGURL: URL, parser: SVGParser? = nil, completion: ((SVGLayer) -> ())? = nil)
convenience init(SVGData: Data, parser: SVGParser? = nil, completion: ((SVGLayer) -> ())? = nil)

All of these initializers will parse a file located in the main bundle, a bundle of your own choosing, or on the web. It will parse the file asynchronously and optionally takes a completion block, passing a SVGLayer after parsing has been completed. Whether you pass a completion block or not, SwiftSVG will add it to the view's sublayers. If you want to change one of the layer's attributes, such as the fill color or resize it to fit a view, you can do that in the completion block

You can optionally pass an SVGParser object if you want to reuse the same parser for various SVG files or want to roll your own using a third-party XML parser. By default, SwiftSVG uses a subclass of Foundation's XMLParser using all the supported elements and attributes called NSXMLSVGParser. You can also optionally setup your own NSXMLSVGParser passing a SVGParserSupportedElements struct that will parse only the elements and attributes of your choosing.

There is also a convenience initializer to parse a single path string, which parses synchronously:

// Declaration
convenience init(pathString: String)

// Example
let triangle = UIView(pathString: "M75 0 l75 200 L0 200 Z")
self.addSubview(triangle)

Output:

This is not a triangle

CALayer+SVG

If you need a little bit more control over your parsed layer, you can use one of the CALayer convenience initalizers. You can make some changes to the parsed SVG layer, such as changing the fill color at runtime, and can add it to a layer of your own choosing. If you are dropping down to the CALayer level, it is assumed that you want more control and you must provide a completion block and you must add it to a sublayer to display it.

let svgURL = Bundle.main.url(forResource: "pizza", withExtension: "svg")!
let pizza = CALayer(SVGURL: svgURL) { (svgLayer) in
    // Set the fill color
    svgLayer.fillColor = UIColor(red:0.94, green:0.37, blue:0.00, alpha:1.00).cgColor
    // Aspect fit the layer to self.view
    svgLayer.resizeToFit(self.view.bounds)
    // Add the layer to self.view's sublayers
    self.view.layer.addSublayer(svgLayer)
}

Output:

This is not delicious pizza

You can create a new CALayer from URL or Data:

convenience init(SVGURL: URL, parser: SVGParser? = nil, completion: @escaping (SVGLayer) -> ())
convenience init(SVGData: Data, parser: SVGParser? = nil, completion: @escaping (SVGLayer) -> ())

SVGLayer

The layer that is passed in the UIView and CALayer completion blocks is an instance of SVGLayer which is a subclass of CAShapeLayer. Currently, SVGLayer adds the following capabilities:

  • A boundingBox property that is the minimum CGRect that encloses all subpaths. Good for scaling the layer to fit a view.
  • Overrides on some properties like the fill color, stroke color, and stroke width that applies that value on all sublayers.
  • An ability to create a copy of the SVGLayer, which is useful for caching.

Other Interfaces

CAShapeLayer & UIBezierPath Single Paths

In addition to the UIView extension that allows you to parse a single <path> d string, you can use the CAShapeLayer or UIBezierPath convenience initializers.

let sockPuppet = "M49.976,36.57l27.343,1.078c7.437,0,13.486-6.05,13.486-13.487s-6.049-13.487-13.485-13.487H58  c-0.429-3.546-2.45-6.235-4.881-6.235s-4.45,2.689-4.877,6.235h-4.368c-0.259,0-0.511,0.01-0.768,0.014  c-0.423-3.553-2.445-6.25-4.88-6.25c-2.719,0-4.924,3.36-4.961,7.523c-5.139,1.369-9.419,3.825-12.781,7.357  c-8.476,8.907-7.963,21.297-7.939,21.737v37.496h4.016V93.5h33.775V78.551h4.471v-1.682c0-8.529,4.16-9.612,4.639-9.708  c0.794-0.026,5.409-0.225,10.103-1.41c9.184-2.323,11.111-6.586,11.111-9.753c0-7.207-5.377-9.775-10.409-9.775  c-0.399,0-0.689,0.018-0.829,0.028H51.104l-0.237,0.017c-0.004,0.001-0.422,0.058-1.042,0.058c-5.218,0-5.218-3.253-5.218-4.322  C44.607,36.887,49.143,36.58,49.976,36.57z M87.441,24.161c0,5.583-4.542,10.124-10.057,10.125l-7.973-0.314  c-4.428-6.087-6.037-11.196-4.771-15.199c0.722-2.282,2.289-3.793,3.675-4.734h9.002C82.899,14.038,87.441,18.579,87.441,24.161z   M69.492,49.615l0.16-0.008c0.035-0.003,0.254-0.021,0.598-0.021c2.632,0,7.046,0.833,7.046,6.412c0,4.667-8.069,6.723-13.864,7.461  c-1.008-0.493-1.786-1.215-2.318-2.167c-1.917-3.429-0.405-8.997,0.517-11.677H69.492z M49.825,49.689  c0.655,0,1.153-0.047,1.384-0.074h9.357c-0.98,2.923-2.377,8.495-0.327,12.164c0.412,0.737,0.946,1.354,1.591,1.858  c-1.001,0.095-1.887,0.147-2.579,0.164l-0.153,0.012c-0.297,0.034-6.954,0.932-7.604,11.374H45.15v-7.053h-3.364v7.053H35.06v-7.053  h-3.363v7.053h-7.147v-7.053h-3.364v7.053h-5.277l-0.002-34.212c-0.005-0.115-0.447-11.52,7.037-19.36  c2.829-2.964,6.458-5.042,10.805-6.269c0.799,2.571,2.501,4.353,4.479,4.353c2.291,0,4.215-2.388,4.788-5.63  c0.291-0.005,0.565-0.031,0.86-0.031h22.781c-1.188,1.029-2.341,2.46-2.964,4.421c-1.327,4.175,0.18,9.371,4.46,15.462  l-18.109-0.714c-3.043,0-8.798,1.838-8.798,8.797C41.244,46.816,44.452,49.689,49.825,49.689z"
let sockPuppetSVG = CAShapeLayer(pathString: sockPuppet)
let returnView = UIView()
self.layer.addSublayer(sockPuppetSVG)

Output:

This is not a sock puppet

let tea = "M166.467916,125.61975 C163.212238,131.944462 153.253694,144.977204 125.484677,151.685233 C123.761082,154.368444 115.143112,162.801395 83.5438847,162.801395 C62.8607545,162.801395 52.3276789,159.351552 46.7738754,156.093366 C44.4757498,158.201604 41.9861137,159.926525 38.9219463,161.076473 L40.2625195,164.717975 C40.8370509,166.442896 39.8794986,168.359476 38.1559044,168.93445 L27.4313183,172.767609 C25.7077241,173.342583 23.7926195,172.384293 23.2180881,170.659372 L20.1539206,161.843105 C19.5793893,160.118183 20.5369416,158.201604 22.2605358,157.62663 L32.9851218,153.793471 C34.708716,153.218497 36.6238207,154.176786 37.1983521,155.901708 L38.3474149,159.159894 C41.0285614,158.201604 43.1351765,156.66834 45.0502812,154.943418 C43.326687,153.410155 42.3691346,152.260207 41.7946032,151.493575 C14.2170962,144.40223 4.83308341,130.986173 1.96042643,124.853118 C1.19438457,123.70317 0.811363636,122.553222 0.811363636,121.403274 C0.811363636,114.695246 12.1104811,109.520481 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C70.5211731,156.476682 59.2220556,155.518392 49.6465323,153.601813 C49.4550219,153.793471 49.4550219,153.793471 49.2635114,153.985129 C54.2427835,156.66834 64.3928382,159.926525 83.9269057,159.926525 Z M151.5301,137.310886 C154.594267,135.01099 157.083903,132.711094 158.999008,130.602857 C144.252702,137.119228 113.802538,140.569071 84.5014371,140.569071 C74.7344033,140.569071 64.7758591,140.185755 55.3918463,139.419123 C54.434294,143.635598 53.2852312,147.468758 51.3701265,150.726943 C60.3711184,152.451865 71.0957045,153.410155 83.9269057,153.410155 C121.079936,153.410155 141.188535,144.785546 151.5301,137.310886 Z M113.228007,37.2654275 C111.887434,35.3488478 110.54686,33.2406102 110.163839,30.5573987 C109.780818,28.0658451 110.738371,25.5742916 112.653475,23.6577119 C113.611028,22.6994221 114.56858,22.1244482 115.526132,21.5494743 C116.292174,20.9745004 117.058216,20.3995265 117.824258,19.8245526 C119.930873,17.716315 119.547852,15.2247614 118.78181,13.4998397 C118.5903,12.9248658 118.207279,12.3498919 117.824258,11.966576 C116.866706,10.8166282 115.143112,7.55844281 118.207279,3.53362553 C119.739363,1.42538791 122.228999,0.658756046 125.293166,0.850414011 C129.314886,1.23372994 133.145095,3.7252835 134.677179,6.79181094 C136.209263,10.0499964 136.017752,14.0748136 134.294158,17.524657 C132.762074,20.3995265 130.272438,22.8910801 126.82525,25.1909756 C126.633739,25.3826336 126.250719,25.5742916 125.867698,25.7659495 C124.527124,26.7242394 123.378062,27.4908712 122.420509,28.4491611 C120.505405,30.3657407 120.122384,33.6239261 121.462957,35.9238217 C121.654467,36.3071376 122.037488,36.6904536 122.228999,37.0737695 C122.61202,37.8404014 122.995041,38.6070332 123.378062,39.3736651 C124.910145,43.5901403 122.037488,46.4650098 119.164831,48.9565634 C118.973321,49.1482213 118.78181,49.1482213 118.5903,49.1482213 C118.398789,49.1482213 118.015769,48.9565634 117.824258,48.7649054 C117.441237,48.1899315 117.632748,47.6149576 118.015769,47.2316417 C121.079936,44.5484302 122.61202,42.6318505 121.654467,39.756981 C121.462957,39.1820071 121.079936,38.6070332 120.696915,38.0320593 C120.505405,37.6487434 120.122384,37.0737695 119.930873,36.6904536 C118.207279,33.6239261 118.78181,29.5991089 121.079936,26.9158973 C122.037488,25.5742916 123.569572,24.6160017 124.910145,23.8493699 C125.293166,23.6577119 125.484677,23.466054 125.867698,23.274396 C128.931865,21.1661584 131.229991,18.8662628 132.570564,16.3747092 C134.102648,13.3081818 134.294158,10.0499964 132.953585,7.55844281 C131.613012,5.06688925 128.357334,3.1503096 125.101656,2.76699367 C123.761082,2.76699367 121.271446,2.76699367 119.739363,4.68357332 C117.441237,7.36678484 118.5903,9.66668043 119.356342,10.6249703 C119.739363,11.1999442 120.313894,11.966576 120.696915,12.7332079 C122.228999,15.9913933 121.654467,19.0579207 119.356342,21.3578163 C118.5903,22.1244482 117.632748,22.6994221 116.675195,23.274396 C115.717643,23.8493699 114.951601,24.2326858 114.185559,24.9993177 C112.844986,26.5325814 112.078944,28.4491611 112.270455,30.3657407 C112.653475,32.4739783 113.802538,34.1989 114.951601,36.1154797 C115.526132,37.0737695 115.909153,37.8404014 116.483685,38.7986912 C117.632748,41.0985868 119.930873,45.50672 116.100664,47.9982735 C115.717643,48.1899315 115.143112,48.1899315 114.760091,47.6149576 C114.56858,47.2316417 114.56858,46.6566678 115.143112,46.2733519 C116.866706,45.1234041 116.675195,43.3984824 114.760091,39.756981 C114.37707,38.9903492 113.802538,38.0320593 113.228007,37.2654275 Z M90.8212824,43.7817983 C90.4382615,43.7817983 90.0552405,43.5901403 90.0552405,43.3984824 C89.8637301,42.8235085 90.0552405,42.2485346 90.6297719,42.0568766 C90.6297719,42.0568766 96.1835754,39.756981 97.3326382,35.3488478 C97.9071696,33.0489522 97.1411278,30.7490566 95.2260231,28.2575031 C91.9703452,24.0410278 90.8212824,20.2078685 91.5873243,17.1413411 C92.1618557,14.2664716 94.4599813,12.158234 97.9071696,10.4333123 C98.481701,10.2416543 99.0562324,10.4333123 99.2477429,11.0082862 C99.4392534,11.5832601 99.2477429,12.158234 98.6732115,12.3498919 C95.8005545,13.6914977 94.0769603,15.4164194 93.5024289,17.524657 C92.7363871,20.0162106 93.8854499,23.274396 96.7581068,26.9158973 C99.0562324,29.9824248 99.8222743,32.8572943 99.0562324,35.7321638 C97.7156592,40.9069288 91.3958138,43.5901403 91.2043033,43.7817983 L90.8212824,43.7817983 Z M53.0937207,118.528405 C45.6248126,111.628718 38.3474149,97.8293446 36.8153311,85.5632348 C36.8153311,84.221629 37.9643939,83.2633392 39.3049672,83.6466551 C42.7521556,84.604945 49.0720009,86.3298667 53.4767416,86.7131826 C52.9022102,93.9961853 52.9022102,102.812452 53.0937207,110.862086 L53.0937207,118.528405 Z"
let teaPath = UIBezierPath(pathString: tea)
let returnView = UIView()
let shapeLayer = CAShapeLayer()
shapeLayer.path = teaPath.cgPath
self.layer.addSublayer(shapeLayer)

Output:

This is not tea

SVGView

Finally, SwiftSVG provides a UIView subclass that is IBInspectable. Simply add a view to your storyboard and use the SVGView subclass as your class name. Then put the name of your SVG file in your bundle in the IBInspectable property "SVGName"

Screenshot of SVGView in Interface Builder

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License

SwiftSVG is released under the MIT License.

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A simple, performant, and lightweight SVG parser

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