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March 9, 2020 23:57
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Swift 5 UIColor+hexString - Accepts RGB/RRGGBB/RRGGBBAA
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| 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) | |
| } | |
| } |
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after displayed, the color value is incorrect