十六进制转颜色

在 开发的过程中UID 给我们的高保真图颜色大多会是十六进制，我们在项目中需要转换：

import UIKit


func HEXCOLOR(_ string: String) -> UIColor {
    if string.characters.count == 6 {
        var red: CUnsignedInt? = 0, green: CUnsignedInt? = 0, blue: CUnsignedInt? = 0
        
        let range1 = string.startIndex..