swift16進位制轉換成UIColor
阿新 • • 發佈:2019-02-06
swift 中利用UIColor擴充套件建立16進位制轉UIColor類如下:
程式碼如下:
extension UIColor {
class func hexStringToColor(hexString: String) -> UIColor{
var cString: String = hexString.trimmingCharacters(in: NSCharacterSet.whitespacesAndNewlines)
if cString.characters.count < 6 {
return UIColor.black
}
if cString.hasPrefix("0X") {
cString = cString.substring(from: cString.index(cString.startIndex, offsetBy: 2))
}
if cString.hasPrefix("#") {
cString = cString.substring(from: cString.index(cString.startIndex, offsetBy: 1))
}
if cString.characters .count != 6 {
return UIColor.black
}
var range: NSRange = NSMakeRange(0, 2)
let rString = (cString as NSString).substring(with: range)
range.location = 2
let gString = (cString as NSString).substring(with: range)
range.location = 4
let bString = (cString as NSString).substring (with: range)
var r: UInt32 = 0x0
var g: UInt32 = 0x0
var b: UInt32 = 0x0
Scanner.init(string: rString).scanHexInt32(&r)
Scanner.init(string: gString).scanHexInt32(&g)
Scanner.init(string: bString).scanHexInt32(&b)
return UIColor(displayP3Red: CGFloat(r)/255.0, green: CGFloat(g)/255.0, blue: CGFloat(b)/255.0, alpha: CGFloat(1))
}
}