XML解析及上拉加载下拉刷新

XML解析及上拉加载下拉刷新

1.XML格式

　　

2.GData和XPath遍历

//配置XML库(配置完才能使用)
 //(1)添加头文件搜索路径
 //      Header Search Paths-> /usr/include/libxml2
 //(2)添加二进制库
 //  Link library ->  lixml2.dylib
 //(3)源文件添加编译选项
 //      -fno-objc-arc
 //(4)添加头文件
 //  #import "GDataXMLNode.h"*/

　　XPath 获取路径  --> 访问数据

 NSString *path = [[NSBundle mainBundle] pathForResource:@"xml" ofType:@"txt"];
 NSData *data = [[NSData alloc] initWithContentsOfFile:path];
    
    //initWithData -- > 使用NSData初始化，解析
    GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithData:data options:0 error:nil];
    
    //获取指定结点 XPath(路径)
    //   CityName路径: /root/systemConfig/CityName
    NSArray *array = [doc nodesForXPath:@"/root/systemConfig/areaCode" error:nil];
    
    GDataXMLElement *element = [array firstObject];
    NSLog(@"name = %@,value = %@",element.name,element.stringValue);     NSArray *items = [doc nodesForXPath:@"/root/systemConfig/ComeChannel/Item" error:nil];
    GDataXMLElement *item = [items firstObject];
//    item.attributes   //属性
    //获取所有属性
    for(GDataXMLElement *attr in item.attributes){
    
        NSLog(@"a-name = %@, a-value = %@",attr.name,attr.stringValue);
    }
    //4.获取所有指定名字的结点（不管位置）
    //XPath
    NSArray *allItem = [doc nodesForXPath:@"//Item" error:nil];
    for(GDataXMLElement *e in allItem){
        NSLog(@"name = %@",e.name);
    }
    //5.获取所有指定名字的值（不管位置）
    //XPath
    NSArray *allValue = [doc nodesForXPath:@"//@value" error:nil];
    for(GDataXMLElement *e in allValue){
        NSLog(@"value = %@",e.stringValue);
    }
    //获取根结点
    GDataXMLElement *rootel = doc.rootElement;
//    NSArray *children = rootel.children;  //获取子结点
//    rootel.childCount  //获取结点个数

3.上拉加载及下拉刷新

　　一般使用第三方开源库

     注：需刷新表格数据　　　　

#import "GDataXMLNode.h"
#import "AAPullToRefresh.h"@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>

{

    ZJHttpRequest *_request;
    NSString *_city;
    NSString *_catagory;   //
    int _offset;   //几行
    int _pageSize;   //#pragma mark - 上拉刷新及下拉加载

-(void)addapullRefreshAndPullLoadMore{

//AAPullToRefresh
    //top
    AAPullToRefresh *tv = [_tableView addPullToRefreshPosition:AAPullToRefreshPositionTop actionHandler:^(AAPullToRefresh *v){
    
        _offset = 1;
        NSLog(@"fresh top");
        [v performSelector:@selector(stopIndicatorAnimation) withObject:nil afterDelay:1.0f];
        [self startDownloadData];
    }];
    tv.imageIcon = [UIImage imageNamed:@"launchpad"];
    tv.borderColor = [UIColor whiteColor];
    
    //buttom
    AAPullToRefresh *bv =[_tableView addPullToRefreshPosition:AAPullToRefreshPositionBottom actionHandler:^(AAPullToRefresh *v){
        
        _offset += _pageSize;
        NSLog(@"add buttom");
        [v performSelector:@selector(stopIndicatorAnimation) withObject:nil afterDelay:1.0f];
        [self startDownloadData];
    }];
    bv.imageIcon = [UIImage imageNamed:@"launchpad"];
    bv.borderColor = [UIColor whiteColor];

}