IOS控件 Tableview 下拉刷新，加载数据

一、 点击此连链接下载资源文件，将 EGORefreshTableHeaderView.h、 EGORefreshTableHeaderView.m两个文件，以及Enormego提供的那一套图片包拖进你的工程里。

二、找到你的  UITableViewController 的 .h 文件，添加相应的代码：

#import "EGORefreshTableHeaderView.h"  
  
@interface RootViewController : UITableViewController  {  
  
EGORefreshTableHeaderView *_refreshHeaderView;  
  
// Reloading var should really be your tableviews datasource 
// Putting it here for demo purposes 
BOOL _reloading;  
}  
  
- (void)reloadTableViewDataSource;  
- (void)doneLoadingTableViewData;  
@end

三、切换到你的  UITableViewController 的 .m 文件，添加相应的代码：

 1 - (void)viewDidLoad {  
 2 [super viewDidLoad];  
 3   
 4 if (_refreshHeaderView == nil) {  
 5   
 6 EGORefreshTableHeaderView *view = [[EGORefreshTableHeaderView alloc] initWithFrame:CGRectMake(0.0f, 0.0f - self.tableView.bounds.size.height, self.view.frame.size.width, self.tableView.bounds.size.height)];  
 7 view.delegate = self;  
 8 [self.tableView addSubview:view];  
 9 _refreshHeaderView = view;  
10 [view release];  
11   
12 }  
13   
14 // update the last update date 
15 [_refreshHeaderView refreshLastUpdatedDate];  
16 }

 1 #pragma mark -  
 2 #pragma mark Data Source Loading / Reloading Methods  
 3   
 4 - (void)reloadTableViewDataSource{  
 5   
 6 // should be calling your tableviews data source model to reload 
 7 // put here just for demo 
 8 _reloading = YES;  
 9   
10 }  
11   
12 - (void)doneLoadingTableViewData{  
13   
14 // model should call this when its done loading 
15 _reloading = NO;  
16 [_refreshHeaderView egoRefreshScrollViewDataSourceDidFinishedLoading:self.tableView];  
17   
18 }  
19   
20 #pragma mark -  
21 #pragma mark UIScrollViewDelegate Methods  
22   
23 - (void)scrollViewDidScroll:(UIScrollView *)scrollView{  
24   
25 [_refreshHeaderView egoRefreshScrollViewDidScroll:scrollView];  
26   
27 }  
28   
29 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{  
30   
31 [_refreshHeaderView egoRefreshScrollViewDidEndDragging:scrollView];  
32   
33 }  
34   
35 #pragma mark -  
36 #pragma mark EGORefreshTableHeaderDelegate Methods  
37   
38 - (void)egoRefreshTableHeaderDidTriggerRefresh:(EGORefreshTableHeaderView*)view{  
39   
40 [self reloadTableViewDataSource];  
41 [self performSelector:@selector(doneLoadingTableViewData) withObject:nil afterDelay:3.0];  
42   
43 }  
44   
45 - (BOOL)egoRefreshTableHeaderDataSourceIsLoading:(EGORefreshTableHeaderView*)view{  
46   
47 return _reloading; // should return if data source model is reloading 
48   
49 }  
50   
51 - (NSDate*)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView*)view{  
52   
53 return [NSDate date]; // should return date data source was last changed 
54   
55 }

四、最后呢，别忘了内存管理习惯，如果是ARC管理则可以不用dealloc。如果是MRC的话，就把下面的那个全部内存释放写上：

1 - (void)viewDidUnload {  
2 _refreshHeaderView=nil;  
3 }  
4   
5 - (void)dealloc {  
6   
7 _refreshHeaderView = nil;  
8 [super dealloc];  
9 }