- （void） （NSXMLParser *）解析器foundCharacters：（NSString *）string 
 {
 [dateString appendString：string]; （NSString *）nameName namespaceURI（NSString *）namespaceURI qualifiedName :( NSString *）qName {
} $（$）
 $ NSDateFormatter * df = [[[NSDateFormatter alloc] init] autorelease]; 
 [df setDateFormat：@dd.MM.yyyy]; //如果以不同的方式使用格式，请更改格式
 NSDate * myDate = [df dateFromString：dateString]; 
 [dateArray addObject：myDate];之后，您可以使用您所述的方式对数组进行排序。  
I am new to iphone development.I am sorting a mutable array with respect to date.But it is sorting Using the date parameter consider it as string.I want to sort it by date.How can i achieve that .Please help me out.
 NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"pubDate" ascending:YES];
[stories sortUsingDescriptors:[NSArray arrayWithObjects:descriptor,nil]];

Can i use selectors? if so how should i use it?.Thanks.


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

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{  
  NSDateFormatter *df = [[[NSDateFormatter alloc] init]autorelease];
  [df setDateFormat:@"dd.MM.yyyy"]; //change the format if you are using it in different way
  NSDate *myDate = [df dateFromString: dateString];
  [dateArray addObject:myDate];
}

after that you can sort the array just using the way you wrote in question.