      
      - returns: <#return value description#>
      */
-    class func imageWithColor(color: UIColor, size: CGSize) -> UIImage {
+    class func imageWithColor(color: UIColor, size: CGSize = CGSize(width: 1, height: 1)) -> UIImage {
         let rect = CGRect(x: 0, y: 0, width: size.width, height: size.height)
         
         UIGraphicsBeginImageContextWithOptions(size, false, 0)

        
        return image
    }
}

extension UIImage {
    /**
     根据颜色、尺寸创建UIImage
     
     - parameter color: <#color description#>
