解析具有相同名稱的屬性，但在在IOS

Question

不同字段我有一個PHP如下：

<?php 
    header("Content-Type: application/rss+xml; charset=ISO-8859-1"); 
    $ip=$_GET['ip']; 
    $type=$_GET['type']; 
    $rssfeed = '<?xml version="1.0" encoding="ISO-8859-1"?>'; 
    $rssfeed .= '<rss version="2.0">'; 
    $connection = mysql_connect('localhost','root') 
    or die('Could not connect to database'); 
    mysql_select_db('Android') 
    or die ('Could not select database'); 
    $query = "SELECT * FROM User_Upload_Table WHERE Status='Approved' and Content_Type='$type' ORDER BY Approved_Time desc"; 
    $result = mysql_query($query) or die ("Could not execute query"); 
    while($row = mysql_fetch_array($result)) { 
      extract($row); 
      $rssfeed .= "<channel>"; 
      $rssfeed .= "<title>" .$row[Content_Name] ."</title>"; 
      $rssfeed .= '<link>http://'.$ip .$row[Content_Path] .$row[Status] . '/' .$row[Content_Name] . '</link>'; 
      if($type == "Video"){ 
      $rssfeed .= '<description>' .$row[Duration]. '</description>'; 
      } 
      $rssfeed .= '<category>' .$row[Description]. '</category>'; 
      $rssfeed .= '<rating>' .$row[Rating]. '</rating>'; 
      $rssfeed .= '<generator>' .$row[Vote_Count]. '</generator>'; 
      $rssfeed .= '<language></language>'; 
      if($type == "Video"){ 
       $name = $row[Content_Name]; 
       $subName = substr($name, 0, strpos($name, '.')); 
       $rssfeed .= '<image>http://'.$ip.'/Android/'.$type.'/'.$subName.'.jpg</image>'; 
      } else { 
       $rssfeed .= '<image>http://'.$ip.'/Android/'.$type.'/Approved.jpg</image>'; 
      } 
      $rssfeed .= '<copyright>Copyright 2011</copyright>'; 
      $rssfeed .= '<item>'; 
      $rssfeed .= '<title>Pre-Roll</title>'; 
      $rssfeed .= '<link>http://'.$ip.'/Android/Video/Approved/MERCEDES_BENZ.3gp</link>'; 
      $rssfeed .= '<description>Post-Roll</description>'; 
      $rssfeed .= '<source>http://'.$ip.'/Android/Video/Approved/PG_Dawn_PGDN4582000_30.mp4</source>'; 
      $rssfeed .= '</item>'; 
      $rssfeed .= '</channel>'; 
    } 
    $rssfeed .= '</rss>'; 
    echo $rssfeed; 
?> 

這裏，我已經具有名稱標題兩個字段，一個在通道和其他在項目屬性。我如何分別解析它。我的解析代碼如下：

-(void)parseXMLFileAtURL:(NSString *)URL{ 

    NSURL *xmlURL = [NSURL URLWithString:URL]; 
    rssParser = [[NSXMLParser alloc]initWithContentsOfURL:xmlURL]; 
    [rssParser setDelegate:self]; 
    [rssParser setShouldProcessNamespaces:NO]; 
    [rssParser setShouldReportNamespacePrefixes:NO]; 
    [rssParser setShouldResolveExternalEntities:NO]; 
    [rssParser parse]; 
    NSLog(@"Parsed"); 
} 

-(void)parserDidStartDocument:(NSXMLParser *)parser{ 

    NSLog(@"Found file and started parsing"); 
} 


-(void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError{ 

NSString *errorString = [NSString stringWithFormat:@"Unable to download feed from website (Error Code %i)", [parseError code]]; 
NSLog(@"Error parsing xml: %@", errorString); 
UIAlertView *errorAlert = [[UIAlertView alloc]initWithTitle:@"Error loading content" message:errorString delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
[errorAlert show]; 
} 


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

    insideItem = FALSE; 
    insideChannel = FALSE; 

    rssElement  = [[NSMutableDictionary alloc]init]; 

    currentElement = [elementName copy]; 
    if ([elementName isEqualToString:@"channel"]) { 

    title   = [[NSMutableString alloc]init]; 
    link   = [[NSMutableString alloc]init]; 
    description  = [[NSMutableString alloc]init]; 
    copyright  = [[NSMutableString alloc]init]; 
    image   = [[NSMutableString alloc]init]; 
    } 
} 


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

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

    [rssElement setObject:title     forKey:@"title"]; 
    [rssElement setObject:link     forKey:@"link"]; 
    [rssElement setObject:description   forKey:@"description"]; 
    [rssElement setObject:copyright    forKey:@"copyright"]; 
    [rssElement setObject:image     forKey:@"image"]; 

    [item addObject:[rssElement copy]]; 
    NSLog(@"adding stories %@", title); 

    } 
} 


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

    if ([currentElement isEqualToString:@"title"]) { 
    [title appendString:string]; 
    }else if ([currentElement isEqualToString:@"link"]) { 
    [link appendString:string]; 
    }else if ([currentElement isEqualToString:@"description"]) { 
    [description appendString:string]; 
    }else if ([currentElement isEqualToString:@"copyright"]) { 
    [copyright appendString:string]; 
    }else if ([currentElement isEqualToString:@"image"]) { 
    [image appendString:string]; 
    } 
} 

-(void)parserDidEndDocument:(NSXMLParser *)parser{ 

    NSLog(@"all done"); 
    NSLog(@"item array has %d items", [item count]); 
    [tableView reloadData]; 
    NSLog(@"Finished Parsing"); 
} 

現在，問題是，當我顯示在表視圖進料，兩種標題字段被越來越所附但我需要只顯示信道屬性的標題字段中。

請幫助我，讓我知道我做錯了什麼。

在這方面，正確的代碼將是巨大的幫助。

Answer 1

在didStartElement中，將當前標籤推送到堆棧。在didEndElement中，從堆棧中彈出它。然後，您可以隨時檢查父元素的堆棧，並區分頻道的標題元素和項目的標題元素。

Answer 2

我已經解決了這個問題。我目前的代碼解決了我的問題如下：

-(void)parseXMLFileAtURL:(NSString *)URL{ 

    NSURL *xmlURL = [NSURL URLWithString:URL]; 
    rssParser = [[NSXMLParser alloc]initWithContentsOfURL:xmlURL]; 
    [rssParser setDelegate:self]; 
    [rssParser setShouldProcessNamespaces:YES]; 
    [rssParser setShouldReportNamespacePrefixes:NO]; 
    [rssParser setShouldResolveExternalEntities:NO]; 
    [rssParser setIsAccessibilityElement:YES]; 
    [rssParser parse]; 
} 


-(void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError{ 

    NSString *errorString = [NSString stringWithFormat:@"Unable to download feed from website (Error Code %i)", [parseError code]]; 
    UIAlertView *errorAlert = [[UIAlertView alloc]initWithTitle:@"Error loading content" message:errorString delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
    [errorAlert show]; 
} 


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

    currentElement = [elementName copy]; 

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

     channelDictionary = [[NSMutableDictionary alloc]init]; 
     itemAttributeArray = [[NSMutableArray alloc]init]; 

     insideItem = FALSE; 
    }else { 
     if ([elementName isEqualToString:@"item"]) { 


     insideItem = TRUE; 
     itemDictionary = [[NSMutableDictionary alloc]init]; 
     } 
    } 
} 

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

    key = [[NSMutableString alloc]init]; 
    key = [currentElement copy]; 

    value = [[NSMutableString alloc]init]; 
    [value setString:string]; 

    if (insideItem == TRUE) { 

     [itemDictionary setObject:value forKey:currentElement]; 
    }else{ 

     [channelDictionary setObject:value forKey:currentElement]; 

    } 

} 

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

    if ([elementName isEqualToString:@"channel"]) { 
     [channelDictionary setObject:itemAttributeArray forKey:@"item"]; 
     [channelAttributeArray addObject:[channelDictionary copy]]; 
    }else { 
     if ([elementName isEqualToString:@"item"]){ 
      [itemAttributeArray addObject:[itemDictionary copy]]; 
      insideItem = FALSE; 
     } 
    } 
} 

-(void)parserDidEndDocument:(NSXMLParser *)parser{ 

    [tableView reloadData]; 
}