如何在Swift中将Color Literal转换为cgColor？

Question

var CodeBackground = #colorLiteral(red: 0.1294117647, green: 0.1294117647, blue: 0.1960784314, alpha: 1)

cells?.layer.borderColor = //... how can i set this color literal to cgColor?

据我所知如何在 Swift

中将 UIColor 转换为 cgColor

例如

UIColor.black.cgColor

Bingo，但是 Swift

中的 cgColor 的 Color Literal 呢？

谢谢。

Answer 1

因为，您已经知道将 colorLiteral 用作 cgcolor 的更简单方法，我将跳到另一种方法...

为此，您需要一个自定义函数，它从 colorLiteral 获取颜色值（红色、绿色、蓝色），如下所示

extension UIColor {
    func rgb() -> (red:Int, green:Int, blue:Int, alpha:Int)? {
    var fRed : CGFloat = 0
    var fGreen : CGFloat = 0
    var fBlue : CGFloat = 0
    var fAlpha: CGFloat = 0
    if self.getRed(&fRed, green: &fGreen, blue: &fBlue, alpha: &fAlpha) {
        let iRed = Int(fRed * 255.0)
        let iGreen = Int(fGreen * 255.0)
        let iBlue = Int(fBlue * 255.0)
        let iAlpha = Int(fAlpha)

        _ = (iAlpha << 24) + (iRed << 16) + (iGreen << 8) + iBlue
        return (red:iRed, green:iGreen, blue:iBlue, alpha:iAlpha)
    } else {
        // Could not extract RGBA components:
        return nil
    }
}
}
//It's more convenient to use function in `UIColor` extension

现在，创建此函数后，您可以将 colorliteral 转换为 cgColor，如下所示...

let CodeBackground = #colorLiteral(red: 0.1294117647, green: 0.1294117647, blue: 0.1960784314, alpha: 1)
let rgblit = CodeBackground.rgb()
let Converted_cgColor = CGColor(srgbRed: CGFloat(integerLiteral: rgblit!.red), green: CGFloat(integerLiteral: rgblit!.green), blue: CGFloat(integerLiteral: rgblit!.blue), alpha: CGFloat(integerLiteral: rgblit!.alpha))

可以直接用Converted_cgColor喜欢

cells?.layer.borderColor = Converted_cgColor

希望对您有所帮助

如何在Swift中将Color Literal转换为cgColor？

How to convert Color Literal to cgColor in the Swift?

uitableview

cgcolor

uicolor

swift