swift material

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)

  }

}

原文地址:https://www.cnblogs.com/yushunwu/p/4190972.html