如何将SwiftUI颜色更改为UIColor? [英] How can I change a SwiftUI Color to UIColor?

问题描述

尝试将SwiftUI颜色更改为UIColor的实例.

Trying to change a SwiftUI Color to an instance of UIColor.

我可以轻松地从UIColor中获取RGBA，但是我不知道如何获取"Color"实例以返回相应的RGB和不透明度值.

I can easily get the RGBA from the UIColor, but I don't know how to get the "Color" instance to return the corresponding RGB and opacity values.

@EnvironmentObject var colorStore: ColorStore

    init() {

        let red = //get red value from colorStore.primaryThemeColor
        let green = //get red value from colorStore.primaryThemeColor
        let blue = //get red value from colorStore.primaryThemeColor
        let opacity = //get red value from colorStore.primaryThemeColor

        let color = UIColor(red: red, green: green, blue: blue, alpha: opacity)
        UINavigationBar.appearance().tintColor = color
    }

...或者也许有更好的方法来完成我要寻找的东西.

...Or maybe there is a better way to accomplish what I am looking for.

推荐答案

该解决方案如何?

extension Color {

    func uiColor() -> UIColor {

        let components = self.components()
        return UIColor(red: components.r, green: components.g, blue: components.b, alpha: components.a)
    }

    private func components() -> (r: CGFloat, g: CGFloat, b: CGFloat, a: CGFloat) {

        let scanner = Scanner(string: self.description.trimmingCharacters(in: CharacterSet.alphanumerics.inverted))
        var hexNumber: UInt64 = 0
        var r: CGFloat = 0.0, g: CGFloat = 0.0, b: CGFloat = 0.0, a: CGFloat = 0.0

        let result = scanner.scanHexInt64(&hexNumber)
        if result {
            r = CGFloat((hexNumber & 0xff000000) >> 24) / 255
            g = CGFloat((hexNumber & 0x00ff0000) >> 16) / 255
            b = CGFloat((hexNumber & 0x0000ff00) >> 8) / 255
            a = CGFloat(hexNumber & 0x000000ff) / 255
        }
        return (r, g, b, a)
    }
}

用法:

let uiColor = myColor.uiColor()

这有点骇人听闻，但这至少是一件事情，直到我们得到一个有效的方法为止.这里的键是self.description，它给出颜色的十六进制描述(如果不是动态的，我应该添加).剩下的只是获取颜色分量并创建UIColor的计算.

It's a bit of a hack, but it's at least something until we get a valid method for this. The key here is self.description which gives a hexadecimal description of the color (if it's not dynamic I should add). And the rest is just calculations to get the color components, and create a UIColor.

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