一般应用都有的一个很重要的功能 ，下拉刷新， -an important function in almost all the app , leah-PullToRefresh

iPhone开发，上拉刷新-, Pull-pull refresh refresh, the pull-refresh, the pull-refresh, the pull-refresh, the pull-refresh, the pull refresh

As pioneered in Twitter for iPhone (née Tweetie 2), pull the table view down to expose a refresh control. Keep pulling and release, and the TableView will reload.