这是我经常使用的代码，用于从 XML 文件构建字典，该文件遵循一些定义明确的重复元素（在本例中为"trip"）的基本模型，以及其中的一系列数据元素，其中一些我正在阅读标签的属性（在本例中"takeoff"为"landing"和"flight"），以及其他我正在读取开始和结束标签之间的数据（在本例中为"price"）。
我有以下 ivars：
@interface XmlParserViewController () <NSXMLParserDelegate>
{
NSMutableArray *trips;
NSMutableDictionary *currentTrip;
NSMutableString *currentElement;
}
@end
然后代码如下所示：
- (void)viewDidLoad
{
[super viewDidLoad];
trips = [[NSMutableArray alloc] init];
// I'm getting my xml from my bundle. You get it however you're currently getting it.
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(@"%s trips=%@", __FUNCTION__, trips);
// generally I immediately kick off the reload of the table, but maybe
// you want to grok the trips dictionary first.
//
// [self.tableView reloadData];
}
正如您所猜想的那样，我正在尝试使用我们已经习惯于解析 JSON 文件的那种嵌套数组/字典结构。显然，我不喜欢我必须在我的代码中预先识别 XML 文件的一些结构的事实（外部数组有"trip"标签，即"takeoff","landing"和"flight"具有属性但 "price"` 没有t) 等。但这比我第一次尝试 XML 解析所有硬编码值的尝试要好一些。叹。