soffes

import UIKit

extension UIColor {

    var luminance: CGFloat {
        var red: CGFloat = 0
        var green: CGFloat = 0
        var blue: CGFloat = 0
        getRed(&red, green: &green, blue: &blue, alpha: nil)

soffes

CFRunLoopSource is cool. It lets you build behavior similar to the mechanisms that drive setNeedsLayout and setNeedsDisplay in UIKit.

I found myself in need of something like this a couple of times. It's great to know that no matter how many times I say I need to update something, I will get a single callback at the end of the run loop that gives me a chance to perform my work.

Here is a little Swift wrapper that makes the API easier to deal with.

---

Updated for Swift 4

soffes

    // Taken from:
    // https://gist.github.com/joelcox/28de2f0cb21ea47bd789

    NSColor.selectedMenuItemColor.set()
    NSBezierPath(rect: rect).fill()

    if rect.height > 1 {
        let currentControlTint = NSColor.currentControlTint
        let startingAlpha: CGFloat = currentControlTint == .blueControlTint ? 0.16 : 0.09

soffes

import Foundation

// Inspired by https://gist.github.com/loudmouth/332e8d89d8de2c1eaf81875cfcd22e24

private struct JSONCodingKeys: CodingKey {
	var stringValue: String

	init?(stringValue: String) {
		self.stringValue = stringValue
	}