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];  }