English: XHWaterDropRefresh is a similar Path 's dropdown refresh component.       has the following functions:         1, set the drop size/water droplets pull-apart distance/water droplets deformation length         2, parallax effect in background         3, in the parallax effect background inside display Avatar           中文:XHWaterDropRefresh是一款类似Path's的下拉刷新的组件，具有以下功能：1、设置水滴大小  / 水滴拉断距离  / 水滴变形长度          2、视觉差的背景图      3、在视觉差背景嵌套头像控件