您可以将结果存储在字典条目数组中，然后您可以使用sortedArrayUsingComparator我在此答案末尾演示的那样对数组进行排序。
例如，我的解析器如下：
@interface XmlParserViewController () <NSXMLParserDelegate>
{
NSMutableArray *trips;
NSMutableDictionary *currentTrip;
NSMutableString *currentElement;
}
@end
@implementation XmlParserViewController
- (void)viewDidLoad
{
[super viewDidLoad];
trips = [[NSMutableArray alloc] init];
// clearly I'm reading your XML from a file in my bundle, but you'll get it
// how ever you're retrieving it from your remote source
NSString *filename = [[NSBundle mainBundle] pathForResource:@"results" ofType:@"xml"];
NSData *data = [NSData dataWithContentsOfFile:filename];
NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
parser.delegate = self;
[parser parse];
}
#pragma mark - NSXMLParserDelegate methods
#define kRowElementTag @"trip"
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict
{
NSArray *attributeElementNames = @[@"takeoff", @"landing", @"flight"];
NSArray *foundCharacterElementNames = @[@"price"];
if ([elementName isEqualToString:kRowElementTag])
{
currentTrip = [[NSMutableDictionary alloc] init];
[trips addObject:currentTrip];
if (attributeDict)
[currentTrip setObject:attributeDict forKey:elementName];
}
else if (currentTrip)
{
if ([attributeElementNames containsObject:elementName])
{
if (attributeDict)
[currentTrip setObject:attributeDict forKey:elementName];
}
else if ([foundCharacterElementNames containsObject:elementName] && currentElement == nil)
{
// you can change this to just grab a few fields ... add whatever fields you want to this
currentElement = [[NSMutableString alloc] init];
[currentTrip setObject:currentElement forKey:elementName];
}
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
if ([elementName isEqualToString:kRowElementTag])
{
currentTrip = nil;
}
else if (currentElement)
{
currentElement = nil;
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
if (currentElement)
{
[currentElement appendString:string];
}
}
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError
{
NSLog(@"%s error=%@", __FUNCTION__, parseError);
// we should handle the error here
}
- (void)parserDidEndDocument:(NSXMLParser *)parser
{
NSLog(@"Order in XML:");
for (NSDictionary *trip in trips)
{
NSLog(@" %@ %@ %@ %@ %@ %@", trip[@"flight"][@"carrier"], trip[@"flight"][@"eq"], trip[@"takeoff"][@"date"], trip[@"takeoff"][@"time"], trip[@"trip"][@"duration"], trip[@"price"]);
}
NSArray *sortedTrips = [self sortResultsByDurationAndPrice];
NSLog(@"Sorted order:");
for (NSDictionary *trip in sortedTrips)
{
NSLog(@" %@ %@ %@ %@ %@ %@", trip[@"flight"][@"carrier"], trip[@"flight"][@"eq"], trip[@"takeoff"][@"date"], trip[@"takeoff"][@"time"], trip[@"trip"][@"duration"], trip[@"price"]);
}
// you can now update your user interface or do whatever at this point
//
// [self.tableView reloadData];
}
你会注意到那个parserDidEndDocument调用sortResultsByDurationAndPrice看起来像：
- (NSArray *)sortResultsByDurationAndPrice
{
NSArray *sortedTrips = [trips sortedArrayUsingComparator: ^(id trip1, id trip2) {
double duration1 = [self durationFromString:trip1[@"trip"][@"duration"]];
double duration2 = [self durationFromString:trip2[@"trip"][@"duration"]];
double price1 = [trip1[@"price"] doubleValue];
double price2 = [trip2[@"price"] doubleValue];
if (duration1 < duration2 || (duration1 == duration2 && price1 < price2)) {
return (NSComparisonResult)NSOrderedAscending;
}
if (duration1 > duration2 || (duration1 == duration2 && price1 > price2)) {
return (NSComparisonResult)NSOrderedDescending;
}
return (NSComparisonResult)NSOrderedSame;
}];
return sortedTrips;
}
// this assumes that duration is in the form of "h:mm"
- (double)durationFromString:(NSString *)durationString
{
NSArray *durationArray = [durationString componentsSeparatedByString:@":"];
return [durationArray[0] doubleValue] + [durationArray[1] doubleValue] / 60.0;
}
// sort by date and time not used, but was part of my original answer
// so I provide it here for the sake of completeness
- (NSArray *)sortResultsByDateTime
{
NSArray *sortedTrips = [trips sortedArrayUsingComparator: ^(id trip1, id trip2) {
NSComparisonResult dateComparison = [trip1[@"takeoff"][@"date"] compare:trip2[@"takeoff"][@"date"]];
NSComparisonResult timeComparison = [trip1[@"takeoff"][@"time"] compare:trip2[@"takeoff"][@"time"]];
if (dateComparison == NSOrderedAscending || (dateComparison == NSOrderedSame && timeComparison == NSOrderedAscending)) {
return (NSComparisonResult)NSOrderedAscending;
}
if (dateComparison == NSOrderedDescending || (dateComparison == NSOrderedSame && timeComparison == NSOrderedDescending)) {
return (NSComparisonResult)NSOrderedDescending;
}
return (NSComparisonResult)NSOrderedSame;
}];
return sortedTrips;
}
显然，您可以sortResults根据您个人的字典条目数组进行调整，但这应该让您了解它是如何工作的。