如何从 CGColor MacOS 中获取字符串 [关闭]

Question

我正在尝试制作一个应用程序，以便更轻松地选择某些颜色，并且为了使用 NSPasteboard.setString 命令，我需要将颜色格式化为字符串。有没有办法可以将 CGColor 更改为字符串？ 谢谢！

Answer 1

这是我使用CGColor 做的一个有用的扩展。您可以获取 RGBA 组件，也可以将它们转换回来。

代码：

extension CGColor {
    /// Components of a color. Contains `rgba`.
    struct Components: Codable {
        let red: CGFloat
        let green: CGFloat
        let blue: CGFloat
        let alpha: CGFloat

        init(red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat) {
            self.red = red
            self.green = green
            self.blue = blue
            self.alpha = alpha
        }

        init?(rgba: [CGFloat]) {
            guard rgba.count == 4 else { return nil }

            red = rgba[0]
            green = rgba[1]
            blue = rgba[2]
            alpha = rgba[3]
        }

        var all: [CGFloat] {
            [red, green, blue, alpha]
        }
    }

    var components: Components? {
        var red: CGFloat = 0
        var green: CGFloat = 0
        var blue: CGFloat = 0
        var alpha: CGFloat = 0
        _ = NSColor(cgColor: self)?.getRed(&red, green: &green, blue: &blue, alpha: &alpha)
        let components = [red, green, blue, alpha]
        return Components(rgba: components)
    }

    static func create(from components: Components) -> CGColor {
        self.init(
            red: components.red,
            green: components.green,
            blue: components.blue,
            alpha: components.alpha
        )
    }
}

用法：

if let components = CGColor(red: 1, green: 0.2, blue: 0.2, alpha: 1).components {
    print(components)
    let new = CGColor.create(from: components)
    print(new)
}

打印：Components(red: 1.0, green: 0.2, blue: 0.2, alpha: 1.0)

打印：<CGColor 0x600003f1d500> [<CGColorSpace 0x600003f1ab80> (kCGColorSpaceICCBased; kCGColorSpaceModelRGB; Generic RGB Profile)] ( 1 0.2 0.2 1 )