Question

我正在使用NSXmlParser从XML获取数据。在解析器委托方法中，我有：

- (void)resetPassCallback: (NSData*) data{
        NSLog(@"start parsing the data");
        NSXMLParser *nsXmlParser = [[NSXMLParser alloc] initWithData:data];
        [nsXmlParser setDelegate:self]; 
        BOOL success = [nsXmlParser parse];
        if (success) {
             NSLog(@"No errors %@", xmlArray);
        } else {
             NSLog(@"Error parsing document!");
        }
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *) namespaceURI qualifiedName:(NSString *)qualifiedName attributes: (NSDictionary *)attributeDict
{
      element = elementName;
      if([elementName isEqualToString:@"User"])
      {
      XmlDict = [[NSMutableDictionary alloc]init];
      userId =[[NSMutableString alloc]init];
      screenName =[[NSMutableString alloc]init];
      xmlArray = [[NSMutableArray alloc]init];
}

}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
    NSLog(@"foundCharacters ::::: %@ :::: ", string);
   [xmlArray addObject:string];
}

虽然我能够解析数据，但我没有得到完整的数据。在控制台中，日志显示：

foundCharacters ::::: 200 :::: 
foundCharacters ::::: f1f47453-04d7-20c8-a9e1-406fdc89a2da :::: 
foundCharacters ::::: test :::: 
foundCharacters ::::: 62e2092a-eb6e-44ad-7a7b-3deb976569c1 :::: 
foundCharacters ::::: Thomas :::: 
xmlArray contents : (
"62e2092a-eb6e-44ad-7a7b-3deb976569c1",
Thomas
)

正如您所看到的，为什么我没有在xmlArray中获得“测试”和其他值。

Answer 1

为什么要用于mutableArray。试试这个

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

        if(!currentElementValue) 
                currentElementValue = [[NSMutableString alloc] initWithString:string];
        else
                [currentElementValue appendString:string];

        NSLog(@"Processing Value: %@", currentElementValue);

}

Answer 2

我希望，每次调用NSXMLParser个代表时，Array都会重新初始化。

您需要在NSXMLParser delegates之前初始化数组调用。

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *) namespaceURI qualifiedName:(NSString *)qualifiedName attributes: (NSDictionary *)attributeDict
{
     //Don't initialise your NSArray here 
    }
}

-(void) parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
     NSLog(@"foundCharacters ::::: %@ :::: ", string);
   [xmlArray addObject:string];
}

Answer 3

在

中使用xmlArray = [[NSMutableArray alloc]init];

- (void)resetPassCallback: (NSData*) data{
    NSLog(@"start parsing the data");
    xmlArray = [[NSMutableArray alloc]init];
    NSXMLParser *nsXmlParser = [[NSXMLParser alloc] initWithData:data];
    [nsXmlParser setDelegate:self]; 
    BOOL success = [nsXmlParser parse];
    if (success) {
         NSLog(@"No errors %@", xmlArray);
    } else {
         NSLog(@"Error parsing document!");
    }
}

不在

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

}

无法使用NSXmlParser获取数据

3 个答案: