import UIKit
extension UIColor {
convenience init(hex:Int, alpha:CGFloat=1.0) {
let red = CGFloat((hex & 0xFF0000) >> 16)/255.0
let green = CGFloat((hex & 0xFF00) >> 8) /255.0
let blue = CGFloat ((hex &0xFF))/255.0
self.init(red:red, green:green, blue:blue, alpha:alpha)
}
struct MKColor {
static let Red = UIColor(hex : 0xF44336)
static let Ping = UIColor(hex:0xE91E63)
}
}
原文：http://www.cnblogs.com/yushunwu/p/4190972.html