//接收Double时间戳返回对应的Date类型
    internal func timeStampToDate (timestamp: Double) -> NSDate {
        var date = NSDate(timeIntervalSince1970: timestamp)
        println("timeStampToDate:\(date)")
        return date
    }
    
    //根据色值返回颜色
    class func UIColorFromRGB(rgbValue: UInt) -> UIColor {
        return UIColor(
            red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,blue: CGFloat(rgbValue & 0x0000FF) / 255.0,alpha: CGFloat(1.0)
        )
    }