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Swift 3: CSS color names and hex to UIColor. UIColor from hex 3, 4, 6, and 8 characters in length with or without # prefix. UIColor to hex. UIColor extension that creates immutable UIColor instances from hexadecimal and CSS color name strings (e.g. ff0, #f00, ff0000, ff0000ff, Pink, aZure, CLEAR, nil). Conversely, you can obtain a UIColor's hexa…
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| // | |
| // UIColor.swift | |
| // previously Color+HexAndCSSColorNames.swift | |
| // | |
| // Created by Norman Basham on 12/8/15. | |
| // Copyright © 2017 Black Labs. All rights reserved. | |
| // | |
| // Permission is hereby granted, free of charge, to any person obtaining a copy | |
| // of this software and associated documentation files (the "Software"), to deal | |
| // in the Software without restriction, including without limitation the rights | |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| // copies of the Software, and to permit persons to whom the Software is | |
| // furnished to do so, subject to the following conditions: | |
| // | |
| // The above copyright notice and this permission notice shall be included in | |
| // all copies or substantial portions of the Software. | |
| // | |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
| // THE SOFTWARE. | |
| import UIKit | |
| public extension UIColor { | |
| /** | |
| Creates an immuatble UIColor instance specified by a hex string, CSS color name, or nil. | |
| - parameter hexString: A case insensitive String? representing a hex or CSS value e.g. | |
| - **"abc"** | |
| - **"abc7"** | |
| - **"#abc7"** | |
| - **"00FFFF"** | |
| - **"#00FFFF"** | |
| - **"00FFFF77"** | |
| - **"Orange", "Azure", "Tomato"** Modern browsers support 140 color names (<http://www.w3schools.com/cssref/css_colornames.asp>) | |
| - **"Clear"** [UIColor clearColor] | |
| - **"Transparent"** [UIColor clearColor] | |
| - **nil** [UIColor clearColor] | |
| - **empty string** [UIColor clearColor] | |
| */ | |
| public convenience init(hex: String?) { | |
| let normalizedHexString: String = UIColor.normalize(hex) | |
| var c: CUnsignedInt = 0 | |
| Scanner(string: normalizedHexString).scanHexInt32(&c) | |
| self.init(red:UIColorMasks.redValue(c), green:UIColorMasks.greenValue(c), blue:UIColorMasks.blueValue(c), alpha:UIColorMasks.alphaValue(c)) | |
| } | |
| /** | |
| Returns a hex equivalent of this UIColor. | |
| - Parameter includeAlpha: Optional parameter to include the alpha hex. | |
| color.hexDescription() -> "ff0000" | |
| color.hexDescription(true) -> "ff0000aa" | |
| - Returns: A new string with `String` with the color's hexidecimal value. | |
| */ | |
| public func hexDescription(_ includeAlpha: Bool = false) -> String { | |
| guard self.cgColor.numberOfComponents == 4 else { | |
| return "Color not RGB." | |
| } | |
| let a = self.cgColor.components!.map { Int($0 * CGFloat(255)) } | |
| let color = String.init(format: "%02x%02x%02x", a[0], a[1], a[2]) | |
| if includeAlpha { | |
| let alpha = String.init(format: "%02x", a[3]) | |
| return "\(color)\(alpha)" | |
| } | |
| return color | |
| } | |
| fileprivate enum UIColorMasks: CUnsignedInt { | |
| case redMask = 0xff000000 | |
| case greenMask = 0x00ff0000 | |
| case blueMask = 0x0000ff00 | |
| case alphaMask = 0x000000ff | |
| static func redValue(_ value: CUnsignedInt) -> CGFloat { | |
| return CGFloat((value & redMask.rawValue) >> 24) / 255.0 | |
| } | |
| static func greenValue(_ value: CUnsignedInt) -> CGFloat { | |
| return CGFloat((value & greenMask.rawValue) >> 16) / 255.0 | |
| } | |
| static func blueValue(_ value: CUnsignedInt) -> CGFloat { | |
| return CGFloat((value & blueMask.rawValue) >> 8) / 255.0 | |
| } | |
| static func alphaValue(_ value: CUnsignedInt) -> CGFloat { | |
| return CGFloat(value & alphaMask.rawValue) / 255.0 | |
| } | |
| } | |
| fileprivate static func normalize(_ hex: String?) -> String { | |
| guard var hexString = hex else { | |
| return "00000000" | |
| } | |
| if let cssColor = cssToHexDictionairy[hexString.uppercased()] { | |
| return cssColor.characters.count == 8 ? cssColor : cssColor + "ff" | |
| } | |
| if (hexString.hasPrefix("#")) { | |
| hexString = String(hexString.characters.dropFirst()) | |
| } | |
| if hexString.characters.count == 3 || hexString.characters.count == 4 { | |
| hexString = hexString.characters.map{ "\($0)\($0)" }.joined() | |
| } | |
| let hasAlpha = hexString.characters.count > 7 | |
| if (!hasAlpha) { | |
| hexString = hexString + "ff" | |
| } | |
| return hexString; | |
| } | |
| /** | |
| All modern browsers support the following 140 color names (see http://www.w3schools.com/cssref/css_colornames.asp) | |
| */ | |
| fileprivate static func hexFromCssName(_ cssName: String) -> String { | |
| let key = cssName.uppercased() | |
| if let hex = cssToHexDictionairy[key] { | |
| return hex | |
| } | |
| return cssName | |
| } | |
| fileprivate static let cssToHexDictionairy : Dictionary<String, String> = [ | |
| "CLEAR" : "00000000", | |
| "TRANSPARENT" : "00000000", | |
| "" : "00000000", | |
| "ALICEBLUE" : "F0F8FF", | |
| "ANTIQUEWHITE" : "FAEBD7", | |
| "AQUA" : "00FFFF", | |
| "AQUAMARINE" : "7FFFD4", | |
| "AZURE" : "F0FFFF", | |
| "BEIGE" : "F5F5DC", | |
| "BISQUE" : "FFE4C4", | |
| "BLACK" : "000000", | |
| "BLANCHEDALMOND" : "FFEBCD", | |
| "BLUE" : "0000FF", | |
| "BLUEVIOLET" : "8A2BE2", | |
| "BROWN" : "A52A2A", | |
| "BURLYWOOD" : "DEB887", | |
| "CADETBLUE" : "5F9EA0", | |
| "CHARTREUSE" : "7FFF00", | |
| "CHOCOLATE" : "D2691E", | |
| "CORAL" : "FF7F50", | |
| "CORNFLOWERBLUE" : "6495ED", | |
| "CORNSILK" : "FFF8DC", | |
| "CRIMSON" : "DC143C", | |
| "CYAN" : "00FFFF", | |
| "DARKBLUE" : "00008B", | |
| "DARKCYAN" : "008B8B", | |
| "DARKGOLDENROD" : "B8860B", | |
| "DARKGRAY" : "A9A9A9", | |
| "DARKGREY" : "A9A9A9", | |
| "DARKGREEN" : "006400", | |
| "DARKKHAKI" : "BDB76B", | |
| "DARKMAGENTA" : "8B008B", | |
| "DARKOLIVEGREEN" : "556B2F", | |
| "DARKORANGE" : "FF8C00", | |
| "DARKORCHID" : "9932CC", | |
| "DARKRED" : "8B0000", | |
| "DARKSALMON" : "E9967A", | |
| "DARKSEAGREEN" : "8FBC8F", | |
| "DARKSLATEBLUE" : "483D8B", | |
| "DARKSLATEGRAY" : "2F4F4F", | |
| "DARKSLATEGREY" : "2F4F4F", | |
| "DARKTURQUOISE" : "00CED1", | |
| "DARKVIOLET" : "9400D3", | |
| "DEEPPINK" : "FF1493", | |
| "DEEPSKYBLUE" : "00BFFF", | |
| "DIMGRAY" : "696969", | |
| "DIMGREY" : "696969", | |
| "DODGERBLUE" : "1E90FF", | |
| "FIREBRICK" : "B22222", | |
| "FLORALWHITE" : "FFFAF0", | |
| "FORESTGREEN" : "228B22", | |
| "FUCHSIA" : "FF00FF", | |
| "GAINSBORO" : "DCDCDC", | |
| "GHOSTWHITE" : "F8F8FF", | |
| "GOLD" : "FFD700", | |
| "GOLDENROD" : "DAA520", | |
| "GRAY" : "808080", | |
| "GREY" : "808080", | |
| "GREEN" : "008000", | |
| "GREENYELLOW" : "ADFF2F", | |
| "HONEYDEW" : "F0FFF0", | |
| "HOTPINK" : "FF69B4", | |
| "INDIANRED" : "CD5C5C", | |
| "INDIGO" : "4B0082", | |
| "IVORY" : "FFFFF0", | |
| "KHAKI" : "F0E68C", | |
| "LAVENDER" : "E6E6FA", | |
| "LAVENDERBLUSH" : "FFF0F5", | |
| "LAWNGREEN" : "7CFC00", | |
| "LEMONCHIFFON" : "FFFACD", | |
| "LIGHTBLUE" : "ADD8E6", | |
| "LIGHTCORAL" : "F08080", | |
| "LIGHTCYAN" : "E0FFFF", | |
| "LIGHTGOLDENRODYELLOW" : "FAFAD2", | |
| "LIGHTGRAY" : "D3D3D3", | |
| "LIGHTGREY" : "D3D3D3", | |
| "LIGHTGREEN" : "90EE90", | |
| "LIGHTPINK" : "FFB6C1", | |
| "LIGHTSALMON" : "FFA07A", | |
| "LIGHTSEAGREEN" : "20B2AA", | |
| "LIGHTSKYBLUE" : "87CEFA", | |
| "LIGHTSLATEGRAY" : "778899", | |
| "LIGHTSLATEGREY" : "778899", | |
| "LIGHTSTEELBLUE" : "B0C4DE", | |
| "LIGHTYELLOW" : "FFFFE0", | |
| "LIME" : "00FF00", | |
| "LIMEGREEN" : "32CD32", | |
| "LINEN" : "FAF0E6", | |
| "MAGENTA" : "FF00FF", | |
| "MAROON" : "800000", | |
| "MEDIUMAQUAMARINE" : "66CDAA", | |
| "MEDIUMBLUE" : "0000CD", | |
| "MEDIUMORCHID" : "BA55D3", | |
| "MEDIUMPURPLE" : "9370DB", | |
| "MEDIUMSEAGREEN" : "3CB371", | |
| "MEDIUMSLATEBLUE" : "7B68EE", | |
| "MEDIUMSPRINGGREEN" : "00FA9A", | |
| "MEDIUMTURQUOISE" : "48D1CC", | |
| "MEDIUMVIOLETRED" : "C71585", | |
| "MIDNIGHTBLUE" : "191970", | |
| "MINTCREAM" : "F5FFFA", | |
| "MISTYROSE" : "FFE4E1", | |
| "MOCCASIN" : "FFE4B5", | |
| "NAVAJOWHITE" : "FFDEAD", | |
| "NAVY" : "000080", | |
| "OLDLACE" : "FDF5E6", | |
| "OLIVE" : "808000", | |
| "OLIVEDRAB" : "6B8E23", | |
| "ORANGE" : "FFA500", | |
| "ORANGERED" : "FF4500", | |
| "ORCHID" : "DA70D6", | |
| "PALEGOLDENROD" : "EEE8AA", | |
| "PALEGREEN" : "98FB98", | |
| "PALETURQUOISE" : "AFEEEE", | |
| "PALEVIOLETRED" : "DB7093", | |
| "PAPAYAWHIP" : "FFEFD5", | |
| "PEACHPUFF" : "FFDAB9", | |
| "PERU" : "CD853F", | |
| "PINK" : "FFC0CB", | |
| "PLUM" : "DDA0DD", | |
| "POWDERBLUE" : "B0E0E6", | |
| "PURPLE" : "800080", | |
| "RED" : "FF0000", | |
| "ROSYBROWN" : "BC8F8F", | |
| "ROYALBLUE" : "4169E1", | |
| "SADDLEBROWN" : "8B4513", | |
| "SALMON" : "FA8072", | |
| "SANDYBROWN" : "F4A460", | |
| "SEAGREEN" : "2E8B57", | |
| "SEASHELL" : "FFF5EE", | |
| "SIENNA" : "A0522D", | |
| "SILVER" : "C0C0C0", | |
| "SKYBLUE" : "87CEEB", | |
| "SLATEBLUE" : "6A5ACD", | |
| "SLATEGRAY" : "708090", | |
| "SLATEGREY" : "708090", | |
| "SNOW" : "FFFAFA", | |
| "SPRINGGREEN" : "00FF7F", | |
| "STEELBLUE" : "4682B4", | |
| "TAN" : "D2B48C", | |
| "TEAL" : "008080", | |
| "THISTLE" : "D8BFD8", | |
| "TOMATO" : "FF6347", | |
| "TURQUOISE" : "40E0D0", | |
| "VIOLET" : "EE82EE", | |
| "WHEAT" : "F5DEB3", | |
| "WHITE" : "FFFFFF", | |
| "WHITESMOKE" : "F5F5F5", | |
| "YELLOW" : "FFFF00", | |
| "YELLOWGREEN" : "9ACD32" | |
| ] | |
| } |
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