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[UIColor+Extensions] UIColor extensions #extension #iOS
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// | |
// UIColor+Extensions.swift | |
// | |
// Created by Jay Lee on 05/05/2019. | |
// Copyright © 2019 Jay Lee <jaeho.lee@snu.ac.kr> | |
// This work is free. You can redistribute it and/or modify it under the | |
// terms of the Do What The Fuck You Want To Public License, Version 2, | |
// as published by Sam Hocevar. See http://www.wtfpl.net/ for more details. | |
// | |
import UIKit | |
extension UIColor { | |
convenience init(red: Int, green: Int, blue: Int) { | |
assert(red >= 0 && red <= 255, "Invalid red component") | |
assert(green >= 0 && green <= 255, "Invalid green component") | |
assert(blue >= 0 && blue <= 255, "Invalid blue component") | |
self.init(red: CGFloat(red) / 255.0, green: CGFloat(green) / 255.0, blue: CGFloat(blue) / 255.0, alpha: 1.0) | |
} | |
convenience init(rgb: Int) { | |
self.init( | |
red: (rgb >> 16) & 0xFF, | |
green: (rgb >> 8) & 0xFF, | |
blue: rgb & 0xFF | |
) | |
} | |
func lighter(by percentage: CGFloat = 30.0) -> UIColor? { | |
return adjust(by: abs(percentage)) | |
} | |
func darker(by percentage: CGFloat = 30.0) -> UIColor? { | |
return adjust(by: -1 * abs(percentage)) | |
} | |
func adjust(by percentage: CGFloat = 30.0) -> UIColor? { | |
var red: CGFloat = 0, green: CGFloat = 0, blue: CGFloat = 0, alpha: CGFloat = 0 | |
if getRed(&red, green: &green, blue: &blue, alpha: &alpha) { | |
return UIColor(red: min(red + percentage/100, 1.0), | |
green: min(green + percentage/100, 1.0), | |
blue: min(blue + percentage/100, 1.0), | |
alpha: alpha) | |
} else { | |
return nil | |
} | |
} | |
} |
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