Question

Iam消耗XML响应并解析它。但是当我将对象添加到NSMutableDictionary然后再添加到nSMutableArray时，响应为null。我无法理解iam出错的地方？我的Xmlresponse是这样的：

<List>
<Address>
   <City>Michigan</City>
   <Line1>17</Line1>
   <line2>12</Line2>
 </Address>
<Employee>
    <EmployeeName>Williams</EmployeeName>
 </Employee>
 <Address>
   <City>NewYork</City>
   <Line1>27</Line1>
   <line2>52</Line2>
</Address>
<Employee>
    <EmployeeName>Mandarin</EmployeeName>
</Employee>

我的回答应该是这样的：

Michigan 
17
12
Williams

NewYork
27
52
Mandarin

我的解析代码是这样的：

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

element = elementName;
if([elementName isEqualToString:@"Address"])
    {
        arr=[[NSMutableArray alloc] init];
        drr=[[NSMutableDictionary alloc] init];


    }

}

-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
 [srr appendString:string];
}


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

if([elementName isEqualToString:@"City"])
{
    [drr setObject:srr forKey:@"City"];
    [srr release],srr=nil;
    return;
}  

if([elementName isEqualToString:@"Line1"])
{

     [drr setObject:srr forKey:@"Line1"];
     [srr release],srr=nil;
     return;    
}
if([elementName isEqualToString:@"Line2"])
   {

       [drr setObject:srr forKey:@"Line2"];
       [srr release],srr=nil;
       return;      
   }

if([elementName isEqualToString:@"Address"])
{
    [arr addObject:drr];
    [drr release],drr=nil;


}
[srr release],srr=nil;
}
NsLog(@"%@",arr);

但是当我在'arr'检查响应时它会返回NULL吗？Y是这样的吗？我哪里错了？

Answer 1

请在viewDidLoad中初始化您的iVars

arr=[[NSMutableArray alloc] init];
        drr=[[NSMutableDictionary alloc] init];

，因为

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

解析每个元素时会调用

，因此会再次重新分配

将NSMutableDictionary添加到NSMutableArray，返回null

1 个答案: