Just the code for repeatably hashing a string into a color

ColorHash

//Based on https://github.com/ngs/color-hash.swift

import UIKit
import XCPlayground


//magic numbers taken from original
let seed = CGFloat(131.0)
let seed2 = CGFloat(137.0)
let maxSafeInteger = 9007199254740991.0 / seed2
let defaultLS = [CGFloat(0.35), CGFloat(0.5), CGFloat(0.65)]
let full = CGFloat(360.0)

var saturation = CGFloat(0.4)
var brightness = CGFloat(0.8)

var str = "Hello"

//break off each character and extract it's unicore scalar value (then math with magic numbers)
func hashFromString(string:String) -> CGFloat {
    var hash = CGFloat(0)
    for char in "\(string)x".characters {
        if let scalarVal = String(char).unicodeScalars.first?.value {
            if hash > maxSafeInteger {
                hash = hash / seed2
            }
            hash = hash * seed + CGFloat(scalarVal)
        }
    }
    return hash
}

//bit more math to get hue, saturation, brightness
//truncatingRemainder(dividingBy:) is basically a % operation (#swiftThings)
func colorFromString(string:String) -> UIColor {
    var hash = hashFromString(string: string)
    let h = (hash.truncatingRemainder(dividingBy: (full - 1.0))) / full
    hash /= full
    let s = saturation
    let b = brightness
    
    return UIColor(hue: h, saturation: s, brightness: b, alpha: 1.0)
}

//mything.color = colorFromString(string: str)