如何将 RGB 值转换为 HEX 字符串 iOS swift

问题描述：

我想将 RGB 值转换为十六进制字符串.我将十六进制转换为 RGB 如下，但反之亦然.

I Want to convert RGB values to Hex string. I convert Hex to RGB as follow but how I do vice versa.

func hexStringToRGB(_ hexString: String) -> (red: CGFloat, green: CGFloat, blue: CGFloat) {
    var cString:String = hexString.trimmingCharacters(in: .whitespacesAndNewlines).uppercased()

    if (cString.hasPrefix("#")) {
        cString.remove(at: cString.startIndex)
    }

    if ((cString.count) != 6) {
        return (red: 0.0, green: 0.0, blue: 0.0)
    }

    var rgbValue:UInt32 = 0
    Scanner(string: cString).scanHexInt32(&rgbValue)

    return (
        red: CGFloat((rgbValue & 0xFF0000) >> 16),
        green: CGFloat((rgbValue & 0x00FF00) >> 8),
        blue: CGFloat(rgbValue & 0x0000FF))
}

答

let rgbRedValue = 200
let rgbGreenValue = 13
let rgbBlueValue = 45

let hexValue = String(format:"%02X", Int(rgbRedValue)) + String(format:"%02X", Int(rgbGreenValue)) + String(format:"%02X", Int(rgbBlueValue))

另一种解决方法是将 RGB 转换为 UIColor 并从 UIColor 获取 HEX 字符串.

Another workaround could be to convert the RGB to UIColor and get the HEX string from UIColor.

如何将 RGB 值转换为 HEX 字符串 iOS swift

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