     var maxY: CGFloat { return base.frame.maxY }
 }
 
-class UIViewFrameExtension {
+public class UIViewFrameExtension {
     var view: UIView
     
     init(_ view: UIView) {

            self.frame = frame
        }
    }

    /// 视图中心横坐标
    var rat_centerX: CGFloat {
        get {

            self.frame = frame
        }
    }
    
    /// 视图宽度
    var rat_width: CGFloat {
        get {
