Hue is the all-in-one coloring utility that you'll ever need.

Usage

Hex

You can easily use hex colors with the init(hex:) convenience initializer on UIColor. It supports the following hex formats #ffffff, ffffff, #fff, fff

let white = UIColor(hex: "#ffffff")
let black = UIColor(hex: "#000000")
let red = UIColor(hex: "#ff0000")
let blue = UIColor(hex: "#0000ff")
let green = UIColor(hex: "#00ff00")
let yellow = UIColor(hex: "#ffff00")

Computed color properties

let white = UIColor(hex: "#ffffff")
let black = UIColor(hex: "#000000")

if white.isDarkColor {} // return false
if white.isBlackOrWhite {} // return true

Alpha

.alpha is a sugar for colorWithAlphaComponent, internally it does the exact same thing, think of it as a lipstick for your implementation.

let colorWithAlpha = myColor.alpha(0.75)

Gradients

You can easily create gradient layers using the gradient() method on arrays with UIColor. As an extra bonus, you can also add a transform closure if you want to modify the CAGradientLayer.

let gradient = [UIColor.blackColor(), UIColor.orangeColor()].gradient()

let secondGradient = [UIColor.blackColor(), UIColor.orangeColor()].gradient { gradient in
  gradient.locations = [0.25, 1.0]
  return gradient
}

Image colors

let image = UIImage(named: "My Image")
let (background, primary, secondary, detail) = image.colors()

Components

You can get red, green, blue, and alpha components from any UIColor by using the (red|green|blue|alpha)Component property.

let myColor = UIColor(hex: "#ffafc2")
let myColorBlueComponent = myColor.blueComponent
let myColorGreenComponent = myColor.greenComponent
let myColorRedComponent = myColor.redComponent
let myColorAlphaComponent = myColor.alphaComponent

Blending

let red = UIColor.redColor()
let green = UIColor.greenColor()
let yellow = red.addRGB(green)

let desaturatedBlue = UIColor(hex: "#aaaacc")
let saturatedBlue = desaturatedBlue.addHue(0.0, saturation: 1.0, brightness: 0.0, alpha: 0.0)

Examples

Hex

This super simple example that displays a bunch of color schemes in a Carousel view.

It uses hex to set the color for the schemes. It leverages from .isDarkColor to make the text color readable in all scenarios.

The demo also features Spots for rendering the Carousel view.

Example code:

let color = UIColor(hex: "#3b5998")
backgroundColor = color
label.textColor = color.isDark
  ? UIColor.whiteColor()
  : UIColor.darkGrayColor()

Gradients

This examples shows how much fun you can have with combining CAGradientLayer with CABasicAnimation.

It uses .hex for getting the colors and .gradient() for transforming a collection of UIColor's into a CAGradientLayer.

The demo features Spots for rendering the list view and Fakery for generating random content strings.

Extract from the demo:

lazy var gradient: CAGradientLayer = [
  UIColor(hex: "#FD4340"),
  UIColor(hex: "#CE2BAE")
  ].gradient { gradient in
    gradient.speed = 0
    gradient.timeOffset = 0

    return gradient
  }

Installation

Hue is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'Hue'

Hue is also available through Carthage. To install just write into your Cartfile:

github "hyperoslo/Hue"

Author

Hyper made this with ❤️

Contribute

We would love you to contribute to Hue, check the CONTRIBUTING file for more info.

Credits

Credit goes out to Panic Inc who created ColorArt and @jathu for his work on UIImageColors which deeply inspired the functionality behind the image color analysis.

License

Hue is available under the MIT license. See the LICENSE file for more info.