介绍：
下拉和上拉刷新是常见的IOS界面开发功能，目前圈内比较火的组件是MJRefresh，在github上有超过1000的Star,我也下载并阅读了他的代码，易用性高、下拉形式较多，并且开发者本人还在不断的改进和更新，很赞。目前github上也存在很多下拉刷新的组件，开发者们的热情很浓厚。我个人处于学习的目的，准备自己开始造轮子，通过不断的创造来学习，从而增强自己的知识和能力。
Introduction:
Pull-down and pull-up refresh is a common interface of IOS development capabilities, the most used component is MJRefresh now ,ease of use ,more than 1000 Stars in GitHub. I download and read his code, the drop-down form is diversified, and developers are still in the continuous improvement and updating, nice. At present there are also many other drop-down refresh components , the enthusiasm of the developers is very strong. In the purpose of the study, i personally "make the wheels" , through continuous creation to learn, to enhance my own knowledge and ability. Anyone can download to use, please indicate the source. Code may not be the best, i pay a lot attention to user experience and ease of use, if anyone meets with bugs, or wants to talk to me giving learning advice, you can login in weibo "@他们都叫我草莓", I will listen to you。
使用说明：
- 使用条件：
1、被增加组件的scrollView类型对象，必须在组件被创建之前，被添加到一个父元素View中。
2、scrollView类型对象，实现代理协议UIScrollViewDelegate的方法，判定下滑距离，从而启动刷新或停止刷新。
- 创建步骤：
1、引用文件：WheelRefreshControl.h 、WheelRefreshControl.m、WheelIndicatorView.h、WheelIndicatorView.m
2、创建下拉组件：WheelRefreshControl *HeaderRefresh = [[WheelRefreshControl alloc] initHeaderRefreshToScrollView:YourTableView];
下拉刷新：[ HeaderRefresh startHeaderRefreshing ];
停止刷新：[ HeaderRefresh endHeaderRefreshing ];
3、创建下拉组件：WheelRefreshControl *FooterRefresh = [[WheelRefreshControl alloc] initFooterRefreshToScrollView:YourTableView];
下拉刷新：[ FooterRefresh startFooterRefreshing ];
停止刷新：[ FooterRefresh endFooterRefreshing ];
How to use:
- conditions:
1、the scrollView must have been in one parentView before the controls init.
2、code the UIScrollViewDelegate to justify the scrollView's offset to start the control or end the control.
- init steps:
1、import files:WheelRefreshControl.h 、WheelRefreshControl.m、WheelIndicatorView.h、WheelIndicatorView.m
2、pull down component:WheelRefreshControl *HeaderRefresh = [[WheelRefreshControl alloc] initHeaderRefreshToScrollView:YourTableView];
start:[ HeaderRefresh startHeaderRefreshing ];
end：[ HeaderRefresh endHeaderRefreshing ];
3、pull up component:WheelRefreshControl *FooterRefresh = [[WheelRefreshControl alloc] initFooterRefreshToScrollView:YourTableView];
start:[ FooterRefresh startFooterRefreshing ];
end：[ FooterRefresh endFooterRefreshing ];
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