EGORefreshTableHeaderView 下拉刷新加载新数据（转） 沧海一粟

1、导入EGO框架

2、.h文件

    #import <UIKit/UIKit.h>  
    #import "EGORefreshTableHeaderView.h"  
      
    @interface QuanWenArt : UIViewController<UITableViewDelegate, UITableViewDataSource,  
        EGORefreshTableHeaderDelegate,UIScrollViewDelegate>  
    {  
    //    CGFloat   height;  
        EGORefreshTableHeaderView *_refreshHeaderView;  
        BOOL _reloading;  
        NSInteger cellHeight;  
    }  
      
    @property (nonatomic, retain) UITableView *table;  
    @property (nonatomic ,retain) NSArray *data;  
      
    @end  

 .m文件

    #import "QuanWenArt.h"  
    #import "AppDelegate.h"  
    #import "MyNav.h"  
    #import "JSON.h"  
      
    @interface QuanWenArt ()  
      
    @end  
      
    @implementation QuanWenArt  
      
    @synthesize table = _table;  
    @synthesize data = _data;  
      
    -(void)dealloc  
    {  
        [super dealloc];  
        [_table release];  
        [_data release];  
    }  
      
    - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil  
    {  
        self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];  
        if (self) {  
            NSLog(@"----------------------------------------------------------");  
            self.navigationItem.title = @"文章";  
    //        [self.navigationItem.backBarButtonItem setBackButtonBackgroundImage:[UIImage imageNamed:@"navbar.png"]  
    //                                                                   forState:UIControlStateNormal  
    //                                                                 barMetrics:UIBarMetricsDefault];  
              
    //        //自定义返回按钮  
            UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];  
            backButton.frame =  CGRectMake(0, 0, 68, 31);  
            backButton.backgroundColor = [UIColor clearColor];  
            [backButton setBackgroundImage:[UIImage imageNamed:@"btn_back.png"] forState:UIControlStateNormal];  
            [backButton addTarget:self action:@selector(backAction) forControlEvents:UIControlEventTouchUpInside];  
            UIBarButtonItem *backBarButton = [[UIBarButtonItem alloc] initWithCustomView:backButton];  
            self.navigationItem.leftBarButtonItem = backBarButton;  
              
              
              
        }  
        return self;  
    }  
      
    - (void)viewDidLoad  
    {  
        [super viewDidLoad];  
        NSLog(@"这里是QuanWenArt类的viewDidLoad方法");  
        self.table = [[[UITableView alloc] initWithFrame: CGRectMake(0.0, 0.0, 320.0, 480.0) style: UITableViewStylePlain] autorelease];  
        self.table.delegate = self;  
        self.table.dataSource = self;  
        self.view = self.table;  
          
        //初始化数据源  
        AppDelegate *delegate= [[UIApplication sharedApplication] delegate];  
        self.data = delegate.artsOfQWData;  
    //    NSLog(@"list is：%@",self.data);  
          
        //增加下拉刷新加载数据  1；  
        _refreshHeaderView=[[EGORefreshTableHeaderView alloc] initWithFrame:  
                            CGRectMake(0, 440, 320, 480)];  
        _refreshHeaderView.delegate=self;  
        [self.table addSubview:_refreshHeaderView];  
          
        [_refreshHeaderView refreshLastUpdatedDate];  
    }  
      
    -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section  
    {  
        return self.data.count;  
    }  
      
    -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath  
    {  
          
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: @"cell"]; //获取cell  
        [ cell setBackgroundColor:[ UIColor blueColor ] ] ;  
          
        //每次都要清空一下，否则cell中的内容会重叠  
        for (UIView *subview in [cell.contentView subviews])  
            [subview removeFromSuperview];  
          
        if (cell == nil)  
        {  
            cell = [[[UITableViewCell alloc] initWithStyle: UITableViewCellStyleValue1 reuseIdentifier: @"cell"] autorelease];  
        }  
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;   //表格单元右侧的披露按钮  
        cell.selectionStyle = UITableViewCellSelectionStyleGray;  
          
        int selectedIndex = [indexPath indexAtPosition: 1]; //获取行号  
        for (int i=0; i<self.data.count; i++) {  
            if (i == selectedIndex) {  
                NSDictionary *dict = [self.data objectAtIndex:i];  
    //            NSString *idstr = [dict objectForKey:@"id"];  
                NSString *titlestr = [dict objectForKey:@"title"];  
    //            NSString *authorstr = [dict objectForKey:@"author"];  
    //            NSLog(@"id=%@,title=%@,author=%@",idstr,titlestr,authorstr);  
                cell.textLabel.text = titlestr;  
                cellHeight = cell.frame.size.height;  
                break;  
            }  
        }  
          
        return cell;  
    }  
      
    - (void)backAction  
    {  
        [self.navigationController popViewControllerAnimated:YES];  
    }  
      
    //此方法是开始读取数据 增加下拉刷新加载数据  2；  
    - (void)reloadTableViewDataSource  
    {  
        NSLog(@"start");  
        _reloading = YES;  
        //打开线程，读取下一页数据  
        [NSThread detachNewThreadSelector:@selector(requestNext) toTarget:self withObject:nil];  
    }  
      
    //增加下拉刷新加载数据  3；  
    - (void)requestNext  
    {  
        NSAutoreleasePool * pool=[[NSAutoreleasePool alloc] init];  
        //请求下一页数据  
        NSMutableURLRequest *req = [[NSMutableURLRequest alloc] init];  
        NSString *strURL = [NSString stringWithFormat:@"http://192.168.1.49:8080/exz/xmlli?fl=exz-qw-tb&op=new&ps=10&pn=2"];  
        NSURL *connection = [[NSURL alloc] initWithString:strURL];  
          
        [req setURL:connection];  
        [req setHTTPMethod:@"GET"];  
          
        NSURLResponse *rep = nil;  
        NSError *error = nil;  
        NSData *data = [NSURLConnection sendSynchronousRequest:req  
                                             returningResponse:&rep  
                                                         error:&error];  
          
        if(error)  
        {  
            NSLog(@"服务器请求失败");  
        }else {  
            if (data) {  
                NSLog(@"服务器请求成功");  
                NSString *jsonStr = [[NSString alloc] initWithData:data  
                                                          encoding:NSUTF8StringEncoding];  
                NSArray *arr = [jsonStr JSONValue];  
                AppDelegate *delegate= [[UIApplication sharedApplication] delegate];  
                [delegate.artsOfQWData addObjectsFromArray:arr];  
                self.data = delegate.artsOfQWData;  
                [jsonStr release];    
            }  
        }  
          
        [pool release];  
        //回到主线程跟新界面  
        [self performSelectorOnMainThread:@selector(dosomething) withObject:nil waitUntilDone:YES];  
    }  
      
    //增加下拉刷新加载数据  4;  
    -(void)dosomething  
    {  
          
        int count=[self.data count];  
        NSString *str1 = [NSString stringWithFormat:@"%d",count];  
        NSString *str2 = [NSString stringWithFormat:@"%d",self.table.contentSize.height];  
        NSLog(@"-->%@",str1);  
        NSLog(@"-->%@",str2);  
    //    
    //  if(100*count>2000)  
    //  {  
    //        
    //        self.table.contentSize=CGSizeMake(320, 40*count);  
        //设置显示上来加载那一块view的CGRECT  
            _refreshHeaderView.frame=CGRectMake(0, cellHeight*count, 320, 480);  
              
    //  }  
        [self.table reloadData];  
        [self performSelector:@selector(doneLoadingTableViewData) withObject:nil afterDelay:0];  
    }  
      
    //此方法是结束读取数据  
    - (void)doneLoadingTableViewData{  
          
        //  model should call this when its done loading  
        _reloading = NO;  
        [_refreshHeaderView egoRefreshScrollViewDataSourceDidFinishedLoading:self.table];  
        NSLog(@"end");  
          
    }  
      
    #pragma mark -  
    #pragma mark UIScrollViewDelegate Methods  
      
    - (void)scrollViewDidScroll:(UIScrollView *)scrollView{   
          
        [_refreshHeaderView egoRefreshScrollViewDidScroll:self.table];  
          
    }  
      
    - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{  
          
        [_refreshHeaderView egoRefreshScrollViewDidEndDragging:self.table];  
          
    }  
      
      
    #pragma mark -  
    #pragma mark EGORefreshTableHeaderDelegate Methods  
      
    - (void)egoRefreshTableHeaderDidTriggerRefresh:(EGORefreshTableHeaderView*)view{  
          
        [self reloadTableViewDataSource];  
        //[self performSelector:@selector(doneLoadingTableViewData) withObject:nil afterDelay:0.5];  
          
    }  
      
    - (BOOL)egoRefreshTableHeaderDataSourceIsLoading:(EGORefreshTableHeaderView*)view{  
          
        return _reloading; // should return if data source model is reloading  
          
    }  
      
    - (NSDate*)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView*)view{  
          
        return [NSDate date]; // should return date data source was last changed  
          
    }  
      
    - (void)viewDidUnload  
    {  
        [super viewDidUnload];  
        // Release any retained subviews of the main view.  
    }  
      
    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation  
    {  
        return (interfaceOrientation == UIInterfaceOrientationPortrait);  
    }  
      
    @end