IOS开发之下拉刷新和上拉加载更多

IOS开发之下拉刷新和上拉加载更多

1.简介

  常用的下拉刷新和上拉加载更多的实现方式

    (1)UIRefreshControl

    (2)EGOTableViewRefresh

    (3)AH3DPullRefresh

    (4)MJRefresh

    (5)自己实现

 

2.AH3DPullRefresh的使用

  2.1 配置

    1.导入AH3DPullRefresh工程文件

    2.在工程TARGETS-> Build Phases-> Compile Sources->

      搜索UIScrollView+AH3DPullRefresh并在后面加上  “-fno-objc-arc”

    3.添加头UIScrollView+AH3DPullRefresh的头文件

#import "UIScrollView+AH3DPullRefresh.h"

  2.2 使用(基于满座网的实例)

    1.添加下拉刷新和上拉加载更多的方法

#pragma mark 下拉刷新和上拉加载更多
-(void)addPullRefreshAndPullLoadMore{
    [_tableView setPullToRefreshHandler:^{
        //从第一行数据开始下载
        _offset = 1;
        [self startDownloadData];
    }];
    
    [_tableView setPullToLoadMoreHandler:^{
        _offset += _pageSize;
        [self startDownloadData];
    }];
}

    2. 下载数据:如果是下拉刷新先清空所有的数据

//如果_offset = 1,重新刷新
    if (_offset == 1) {
       
        [_dataArray removeAllObjects];
    }

       加载完成新的数据之后结束刷新并刷新表格

 //结束刷新
    [_tableView refreshFinished];
    [_tableView loadMoreFinished];
    [_tableView reloadData];

    3.完整的代码:

-(void)startDownloadData
{
    NSString *urlStr = [NSString stringWithFormat:MAIN_SHOP_URL,_city,_categotry,_offset,_pageSize];
    _reauest = [[HttpRequest alloc]init];
    [_reauest requestWithUrl:urlStr targe:self action:@selector(dealDownloadFinish:)];
}

-(void)dealDownloadFinish:(HttpRequest *)request{
    NSString *str = [[NSString alloc]initWithData:request.data encoding:NSUTF8StringEncoding];
    NSLog(@"%@",str);
    
    GDataXMLDocument *doc = [[GDataXMLDocument alloc]initWithData:request.data  options:0 error:nil];
    NSArray *list = [doc nodesForXPath:@"//promotion" error:nil];
    
    //如果_offset = 1,重新刷新
    if (_offset == 1) {
       
        [_dataArray removeAllObjects];
    }
    
    for (GDataXMLElement *promotion in list) {
        PromotionModel *model = [[PromotionModel alloc]init];
        model.myid = [[[promotion elementsForName:@"id"] firstObject] stringValue];
        model.name = [[[promotion elementsForName:@"name"] firstObject] stringValue];
        [_dataArray addObject:model];

    }
    
    //结束刷新
    [_tableView refreshFinished];
    [_tableView loadMoreFinished];
    [_tableView reloadData];
    
}

 

    

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posted @ 2015-04-05 11:24  BadMao  阅读(1089)  评论(0编辑  收藏  举报