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sneakyness/UIColor+hexString.swift

Created March 9, 2020 23:57
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  1. sneakyness created this gist Mar 9, 2020.
    62 changes: 62 additions & 0 deletions UIColor+hexString.swift
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,62 @@
    import Foundation
    import UIKit

    extension UIColor {
    convenience init(hexString: String) {

    var hexString: String = hexString.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)

    if (hexString.hasPrefix("#")) {
    hexString.removeFirst()
    }

    if hexString.count == 3 {
    var fullString = ""
    for char in hexString {
    fullString.append(char)
    fullString.append(char)
    }
    hexString = fullString
    }

    if hexString.count == 6 {
    hexString.append("FF")
    }

    assert(hexString.count == 8, "invalid hex string used to init UIColor")

    let scanner = Scanner(string: hexString)
    var color: UInt64 = 0
    scanner.scanHexInt64(&color)
    let mask = 0x00000000FF
    let r = Int(color >> 24) & mask
    let g = Int(color >> 16) & mask
    let b = Int(color >> 8) & mask
    let a = Int(color) & mask
    let red = CGFloat(r) / 255.0
    let green = CGFloat(g) / 255.0
    let blue = CGFloat(b) / 255.0
    let alpha = CGFloat(a) / 255.0
    self.init(red:red, green:green, blue:blue, alpha:alpha)
    }

    func toHexString() -> String {
    var r:CGFloat = 0
    var g:CGFloat = 0
    var b:CGFloat = 0
    var a:CGFloat = 0
    getRed(&r, green: &g, blue: &b, alpha: &a)
    let rgb:Int = (Int)(r*255)<<16 | (Int)(g*255)<<8 | (Int)(b*255)<<0
    return String(format:"#%06x", rgb)
    }

    func toHexStringWithAlpha() -> String {
    var r:CGFloat = 0
    var g:CGFloat = 0
    var b:CGFloat = 0
    var a:CGFloat = 0
    getRed(&r, green: &g, blue: &b, alpha: &a)
    let rgba:Int = (Int)(r*255)<<24 | (Int)(g*255)<<16 | (Int)(b*255)<<8 | (Int)(a*255)<<0
    return String(format:"#%06x", rgba)
    }
    }