上点干货,写个extension, 可以通过hex值去设置Color,以及通过UIColor的color case 去得到hex值。
extension UIColor {
var toHexString: String {
var r: CGFloat = 0
var g: CGFloat = 0
var b: CGFloat = 0
var a: CGFloat = 0
self.getRed(&r, green: &g, blue: &b, alpha: &a)
return String(
format: "%02X%02X%02X",
Int(r * 0xff),
Int(g * 0xff),
Int(b * 0xff)
)
}
convenience init(hex: String) {
let scanner = Scanner(string: hex)
scanner.scanLocation = 0
var rgbValue: UInt64 = 0
scanner.scanHexInt64(&rgbValue)
let r = (rgbValue & 0xff0000) >> 16
let g = (rgbValue & 0xff00) >> 8
let b = rgbValue & 0xff
self.init(
red: CGFloat(r) / 0xff,
green: CGFloat(g) / 0xff,
blue: CGFloat(b) / 0xff, alpha: 1
)
}
}
//use example:
let color = UIColor.red
let hex = color.toHexString
// hex == "FF0000"
let color = UIColor(hex: "ff0000")
//color == UIColor.red