ios 下拉刷新

实现的开源框架是:https://github.com/enormego/EGOTableViewPullRefresh

1.实现过程很简单,下载相应的demo,然后拷贝资源文件和EGORefreshTableHeaderView.h和EGORefreshTableHeaderView.m到相依的工程中.

2. 添加QuartzCore.framework组建

3. 在table所在的类中.h 文件中添加如下代码:

@interface iphone_navtaViewController :UITableViewController<EGORefreshTableHeaderDelegate>{        EGORefreshTableHeaderView *_refreshHeaderView;//  Reloading var should really be your tableviews datasource//  Putting it here for demo purposes      BOOL _reloading;} - (void)reloadTableViewDataSource;- (void)doneLoadingTableViewData;@end

然后在.m文件中实现以下个方法

#pragma mark -#pragma mark EGORefreshTableHeaderDelegate Methods- (void)egoRefreshTableHeaderDidTriggerRefresh:(EGORefreshTableHeaderView*)view{NSLog(@"=egoRefreshTableHeaderDidTriggerRefresh");[self reloadTableViewDataSource];[self performSelector:@selector(doneLoadingTableViewData) withObject:nil afterDelay:3.0];}- (BOOL)egoRefreshTableHeaderDataSourceIsLoading:(EGORefreshTableHeaderView*)view{//NSLog(@"=egoRefreshTableHeaderDataSourceIsLoading");return _reloading; // should return if data source model is reloading}- (NSDate*)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView*)view{NSLog(@"=egoRefreshTableHeaderDataSourceLastUpdated");return [NSDate date]; // should return date data source was last changed}#pragma mark -#pragma mark Data Source Loading / Reloading Methods- (void)reloadTableViewDataSource{NSLog(@"==reloadTableViewDataSource");//  should be calling your tableviews data source model to reload//  put here just for demo_reloading = YES;}- (void)doneLoadingTableViewData{NSLog(@"==doneLoadingTableViewData");//  model should call this when its done loading_reloading = NO;[_refreshHeaderView egoRefreshScrollViewDataSourceDidFinishedLoading:self.tableView];}

#pragma mark -#pragma mark UIScrollViewDelegate Methods- (void)scrollViewDidScroll:(UIScrollView *)scrollView{[_refreshHeaderView egoRefreshScrollViewDidScroll:scrollView];     }- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{[_refreshHeaderView egoRefreshScrollViewDidEndDragging:scrollView];}

以上方法主要的调用顺序是：下拉的时候会一直调用  egoRefreshTableHeaderDataSourceIsLoading

                                              释放之后会调用    egoRefreshTableHeaderDidTriggerRefresh ——>  reloadTableViewDataSource（这个方法中写松手后要实现的操作）

     当reloadTableViewDataSource方法执行完后会调用    doneLoadingTableViewData（这个方法实现执行完成后的操作）