Colors

Episode #283 | 9 minutes | published on July 7, 2017 | Uses swift-3.0, Xcode-8.3

Subscribers Only

core graphics

What are color spaces? Sam discusses the common color spaces you might use and what they are used for. Why would you use these methods instead of just using UIColor? If you want cross-platform compatible drawing code, you’ll want to know how this works.

This episode is part of a series: Dive Into Core Graphics.

1. Intro 2 min

2. Basic Shapes 7 min

3. Paths 17 min

4. Colors 9 min

5. Gradients 11 min

6. Clipping Paths 6 min

7. Context Transforms 10 min

8. Images 7 min

9. Text 9 min

10. Offscreen Rendering 12 min

11. Custom CALayer 13 min

12. Pie Progress View 7 min

13. Watermarking Photos 6 min

14. Working in AppKit 8 min

Getting a Color Space

// RGB
CGColorSpaceCreateDeviceRGB()

// Grayscale
CGColorSpaceCreateDeviceGray()

// CMYK
CGColorSpaceCreateDeviceCMYK()

Creating Colors with Color Spaces

let colorSpace = CGColorSpaceCreateDeviceRGB()
let color = CGColor(colorSpace: colorSpace, components: [0, 1, 0, 1])!

context.setFillColor(color)
context.fill(bounds)

context.setFillColor(CGColor(colorSpace: colorSpace, components: [0, 0, 1, 0.5])!)
context.setBlendMode(.normal)
context.fill(rect.insetBy(dx: 64, dy: 64))

View on Github

Download