Swift String to UIColor(16进制字符串转颜色值)

func colorWithHexString (hex:String) -> UIColor {
	var cString:String = hex.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()).uppercaseString
	if (cString.hasPrefix("#")) {
	cString = cString.substringFromIndex(1)
	}
	if (countElements(cString) != 6) {
	return UIColor.grayColor()
	}
	var rString = cString.substringToIndex(2)
	var gString 2)2)
	var bString 4)2)
	var r:CUnsignedInt = 0,g:CUnsignedInt = 0,b:CUnsignedInt 0;
	NSScanner.scannerWithString(rString).scanHexInt(&r)
	.scannerWithString(gString)&g)
	.scannerWithString(bString)&b)
	return UIColor(red: Float(r) / 255.Float(g) / 255Float(b) Float(1))
	}