uicolor ,nsdata -->extension 记录一

importUIKit

extension UIColor {

   convenienceinit(r :CGFloat, g :CGFloat, b :CGFloat) {

    self.init(red: r/255.0, green: g/255.0, blue: b/255.0, alpha:1.0)

    }

//快捷生成随机颜色

     class func randomColor() ->UIColor{

        return UIColor(r: CGFloat(arc4random_uniform(256)), g: CGFloat(arc4random_uniform(256)), b: CGFloat(arc4random_uniform(256)))

    }

}

//返回时间

importFoundation

extension NSDate {

    classfuncgetCurrentTime() ->String{

        letnowData =NSDate()

        letinterval = nowData.timeIntervalSince1970

        return"\(interval)"

    }

}