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UIColor to Hex and Back
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| /* | |
| Credits | |
| ======= | |
| https://cocoacasts.com/from-hex-to-uicolor-and-back-in-swift | |
| Usage | |
| =========== | |
| let green = UIColor(hex: "12FF10") | |
| let greenWithAlpha = UIColor(hex: "12FF10AC") | |
| UIColor.blue.toHex | |
| UIColor.orange.toHex() | |
| UIColor.brown.toHex(with: true) | |
| */ | |
| import UIKit | |
| extension UIColor { | |
| // MARK: - Initialization | |
| convenience init?(hex: String) { | |
| var hexSanitized = hex.trimmingCharacters(in: .whitespacesAndNewlines) | |
| hexSanitized = hexSanitized.replacingOccurrences(of: "#", with: "") | |
| var rgb: UInt32 = 0 | |
| var r: CGFloat = 0.0 | |
| var g: CGFloat = 0.0 | |
| var b: CGFloat = 0.0 | |
| var a: CGFloat = 1.0 | |
| let length = hexSanitized.count | |
| guard Scanner(string: hexSanitized).scanHexInt32(&rgb) else { return nil } | |
| if length == 6 { | |
| r = CGFloat((rgb & 0xFF0000) >> 16) / 255.0 | |
| g = CGFloat((rgb & 0x00FF00) >> 8) / 255.0 | |
| b = CGFloat(rgb & 0x0000FF) / 255.0 | |
| } else if length == 8 { | |
| r = CGFloat((rgb & 0xFF000000) >> 24) / 255.0 | |
| g = CGFloat((rgb & 0x00FF0000) >> 16) / 255.0 | |
| b = CGFloat((rgb & 0x0000FF00) >> 8) / 255.0 | |
| a = CGFloat(rgb & 0x000000FF) / 255.0 | |
| } else { | |
| return nil | |
| } | |
| self.init(red: r, green: g, blue: b, alpha: a) | |
| } | |
| // MARK: - Computed Properties | |
| var toHex: String? { | |
| return toHex() | |
| } | |
| // MARK: - From UIColor to String | |
| func toHex(alpha: Bool = false) -> String? { | |
| guard let components = cgColor.components, components.count >= 3 else { | |
| return nil | |
| } | |
| let r = Float(components[0]) | |
| let g = Float(components[1]) | |
| let b = Float(components[2]) | |
| var a = Float(1.0) | |
| if components.count >= 4 { | |
| a = Float(components[3]) | |
| } | |
| if alpha { | |
| return String(format: "%02lX%02lX%02lX%02lX", lroundf(r * 255), lroundf(g * 255), lroundf(b * 255), lroundf(a * 255)) | |
| } else { | |
| return String(format: "%02lX%02lX%02lX", lroundf(r * 255), lroundf(g * 255), lroundf(b * 255)) | |
| } | |
| } | |
| } |
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