在xcode中解析XML数据并存储它

Question

我有一个XML文件，里面有5个项目（每个都有标题和网址）我希望使用xml解析在xcode中检索所有这些项目，然后想要将所有条目存储在数组中，以便我可以在应用程序中使用它们。让我告诉你我的所有代码。

XML文件

<data>
<item>
<title>Eggs</title>
<link>
http://URL/ios/category.php?cat_id=14
</link>
</item>
<item>
<title>Bakery</title>
<link>
http://URL/ios/category.php?cat_id=15
</link>
</item>
<item>
<title>Bread</title>
<link>
http://URL/ios/category.php?cat_id=16
</link>
</item>
<item>
<title>Cakes, Pies Patisserie</title>
<link>
http://URL/ios/category.php?cat_id=17
</link>
</item>
<item>
<title>Specialty Breads</title>
<link>
http://URL/ios/category.php?cat_id=119
</link>
</item>
</data>

这是我的头文件

#import "XMLStringFile.h"

@interface MyViewController : UIViewController<NSXMLParserDelegate>{
    NSMutableArray *rssOutputData;
    NSMutableString *nodecontent;
    NSXMLParser *xmlParserObject;
    XMLStringFile *xmlStringFileObject;
}

现在在xcode中这是我的viewdidload代码

rssOutputData = [[NSMutableArray alloc]init];
    NSData *xmlData=[[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:@"http://URL/mycategories.xml"]];
    xmlParserObject =[[NSXMLParser alloc]initWithData:xmlData];
    [xmlParserObject setDelegate:self];
    [xmlParserObject parse];

这里是所有解析方法

#pragma mark NSXMLParser delegate
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict
{
    if([elementName isEqualToString:@"item"]){
        xmlStringFileObject =[[XMLStringFile alloc]init];
    } else {
        nodecontent = [[NSMutableString alloc] init];
    }
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    [nodecontent appendString:[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]];
    NSLog(@"node content = %@",nodecontent);
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if([elementName isEqualToString:@"item"]){
        [rssOutputData addObject:xmlStringFileObject];
        xmlStringFileObject = nil;
    } else if([elementName isEqualToString:@"title"]){
        xmlStringFileObject.xmltitle= nodecontent;
        nodecontent = nil;
    }
    else if([elementName isEqualToString:@"link"]){
        xmlStringFileObject.xmllink= nodecontent;
        nodecontent = nil;
    }
}

这是XMLStringFile.h和XMLStringFile.m

XMLStringFile.h

#import <Foundation/Foundation.h>

@interface XMLStringFile : NSObject {
    NSString *xmllink,*xmltitle;
}
@property(nonatomic,retain)NSString *xmllink,*xmltitle;
@end

和XMLStringFile.m文件

#import "XMLStringFile.h"
@implementation XMLStringFile
@synthesize xmllink,xmltitle;
-(void)dealloc
{
}

现在我想将我的两个条目存储在两个单独的数组标题和链接中，然后我希望将来从这些数组中检索它们。我需要帮助，请让我知道我该怎么做。现在xmltitle和xmllink存储检索到的数据但是如果我在另一个函数中使用它，那么只有nslog是最后一个。

Answer 1

下载XMLReader

在ViewDidLoad方法中。

- (void)viewDidLoad {

    NSData *xmlData=[[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:@"http://cms.proxiclients.com/choithrams/mycategories.xml"]];

    NSString *XMLString = [[NSString alloc]initWithData:xmlData encoding:NSUTF8StringEncoding];

    XMLString = [XMLString stringByReplacingOccurrencesOfString:@"\n" withString:@""];

    NSDictionary *dict = [XMLReader dictionaryForXMLString:XMLString error:nil];

    NSLog(@"== %@",dict);

    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

您可以获得如下字典值。

NSString *linkText = [[[[dict valueForKey:@"data"] valueForKey:@"item"] valueForKey:@"link"] valueForKey:@"text"];
linkText = [linkText stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

您的输出是字典：