将 XML 数据解析为 NSMutableArray iOS - iPhone

Question

这是 XML 数据：

<Categorys> 
    <Category>  
        <categoryId>25</categoryId>  
            <categoryName>My Photos</categoryName>                                  
                <categoryDescription>Description</categoryDescription>      
            <categoryIconPath>7.jpg</categoryIconPath>      
            <userId>2</userId>  
            <categoryStatus>ON</categoryStatus>  
        <publicPrivate>Private</publicPrivate>
    </Category>
......more categories
<Categorys>

在这里，我想将<categoryName> 值放入我的NSMutableArray categList。

我使用的代码是：

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI
                                       qualifiedName:(NSString *)qualifiedName 
                                          attributes:(NSDictionary*)attributeDict {

    if ( [elementName isEqualToString:@"categList"]) {
        // addresses is an NSMutableArray instance variable
        if (!categList)
            categList = [[NSMutableArray alloc] init];
        return;
    }

    NSLog(@"StartedElement %@", elementName);

    element = [NSMutableString string];

}


- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {

    if(element == nil)

        element = [[NSMutableString alloc] init];

        [element appendString:string];

}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName 
                                      namespaceURI:(NSString *)namespaceURI
                                     qualifiedName:(NSString *)qName {

    NSLog(@"Found an element named: %@ with a value of: %@", elementName, element);

    if ([elementName isEqualToString:@"categoryName"]) {

        NSLog(@"\n\n\nfound::::::::::::::: %@", element);

        category = element;

        NSLog(@"category:::: %@", category);

    }

    [categList addObject:element];
    NSLog(@"categList*************** %@", categList);
}

但我没有在我的NSMutableArray categList 中获得类别名称：

我的代码有什么问题？ :(

谢谢

Answer 1

嘿，你可以使用XMLReader，但它会返回NSDictionary。

XMLReader to get NSDictionary 的以下代码演示。

在您的文件中导入XMLReader。

#import "XMLReader.h"

然后使用以下方法获取NSDictionary。您必须将XML 传递为NSString .

NSDictionary* xmlDict = [XMLReader dictionaryForXMLString:theXML error:&er];

Answer 2

如果您想使用 GDataXMLParser，您可以使用以下运行良好的代码

首先 Impost GDataXMLParser 库文件，然后写入 vbe

 -(void)XMLParsing
 {

      GdataParser *parser = [[GdataParser alloc] init];

      NSString* urlString = @"YOURURL"; 

      NSURL *url = [[NSURL alloc] initWithString:urlString];

      [parser downloadAndParse:url withRootTag:@"Category" withTags:[NSDictionary dictionaryWithObjectsAndKeys:@"categoryId",@"categoryId",@"categoryName",@"categoryName",@"categoryDescription",@"categoryDescription",@"categoryIconPath",@"categoryIconPath",@"userId",@"userId",@"categoryStatus",@"categoryStatus",@"publicPrivate",@"publicPrivate",nil] 
                         sel:@selector(finishGetDataSF:) 
                  andHandler:self];
      [urlSR release];
      [parser release];
  } 


  -(void)getDate:(NSDictionary*)dict
  {
      NSLog(@"Data from XML file  ==  %@",dict);

      NSArray* arrayTemp = [dict copy];
  }

Answer 3

我在这里解析了你的应用程序，它工作得很好，请检查它是否创建了一个面向对象的类别并使用它。

 -(void)loaddatafromxml
  {
    NSString *ur=[NSString stringWithFormat:@"Enter your url"]; 

     NSURL *url=[NSURL URLWithString:ur];
     NSMutableURLRequest *req=[NSMutableURLRequest requestWithURL:url];
     conn=[[NSURLConnection alloc]initWithRequest:req delegate:self];
     if(conn)
     webdata=[[NSMutableData data]retain];
  }

 -(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
 {
[webdata appendData:data];
  }
 -(void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
  {
[webdata setLength:0];  
   }

-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
categaryArry=[[NSMutableArray alloc]init];


  NSString *thexml=[[NSString alloc] initWithBytes:[webdata mutableBytes] length:[webdata length] encoding:NSASCIIStringEncoding];

  NSArray *arr=[thexml componentsSeparatedByString:@"<Category>"];


for(int i=1;i<[arr count];i++)
{
    categList *object = [[categList alloc] init];
    NSString *str=[arr objectAtIndex:i];


    NSArray *arr=[str componentsSeparatedByString:@"<categoryId>"];
    NSString *data=[arr objectAtIndex:1];
    NSRange ranfrom=[data rangeOfString:@"</categoryId>"];
    object.catid=[data substringToIndex:ranfrom.location];





    arr=[str componentsSeparatedByString:@"<categoryName>"];
    data=[arr objectAtIndex:1];
    ranfrom=[data rangeOfString:@"</categoryName>"];
   object.catname=[data substringToIndex:ranfrom.location];



    arr=[str componentsSeparatedByString:@"<categoryDescription>"];
    data=[arr objectAtIndex:1];
    ranfrom=[data rangeOfString:@"</categoryDescription>"];
   object.catdesc=[data substringToIndex:ranfrom.location];






    arr=[str componentsSeparatedByString:@"<categoryIconPath>"];
    data=[arr objectAtIndex:1];
    ranfrom=[data rangeOfString:@"</categoryIconPath>"];
    object.caticon=[data substringToIndex:ranfrom.location];





    arr=[str componentsSeparatedByString:@"<userId>"];
    data=[arr objectAtIndex:1];
    ranfrom=[data rangeOfString:@"</userId>"];
    object.userid=[data substringToIndex:ranfrom.location];





    arr=[str componentsSeparatedByString:@"<categoryStatus>"];
    data=[arr objectAtIndex:1];
    ranfrom=[data rangeOfString:@"</categoryStatus>"];
    object.catstatus=[data substringToIndex:ranfrom.location];





    arr=[str componentsSeparatedByString:@"<publicPrivate>"];
    data=[arr objectAtIndex:1];
    ranfrom=[data rangeOfString:@"</publicPrivate>"];
    object.publicpriv=[data substringToIndex:ranfrom.location];


    [categaryArry addObject:object];
}   

[self.table_data reloadData];

[thexml release];

[connection release];

 }

并将loaddatafrm xml函数调用为[self loaddatafromxml]；效果不错，试试吧。

谢谢

Answer 4

您使用 if ( [elementName isEqualToString:@"categList"])...，但我在您的 XML 示例中找不到 categList 名称。请检查 - 这可能是个问题。