XML 解析

我们将通过 NSXMLParser 解析突出显示的标签数据

我们已经声明了如下几个属性

@property(nonatomic, strong)NSMutableArray *results;
@property(nonatomic, strong)NSMutableString *parsedString;
@property(nonatomic, strong)NSXMLParser *xmlParser;

//Fetch xml data
NSURLSession *session=[NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    
NSURLSessionDataTask *task=[session dataTaskWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:YOUR_XMLURL]] completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
    
self.xmlParser=[[NSXMLParser alloc] initWithData:data];
self.xmlParser.delegate=self;
if([self.xmlParser parse]){
   //If parsing completed successfully
        
        NSLog(@"%@",self.results);
        
}
    
}];
    
[task resume];

然后我们定义 NSXMLParserDelegate

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(nullable NSString *)namespaceURI qualifiedName:(nullable NSString *)qName attributes:(NSDictionary<NSString *, NSString *> *)attributeDict{
    
    if([elementName isEqualToString:@"GeocodeResponse"]){
        self.results=[[NSMutableArray alloc] init];
    }
    
    if([elementName isEqualToString:@"formatted_address"]){
        self.parsedString=[[NSMutableString alloc] init];
    }

}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    
    if(self.parsedString){
        [self.parsedString appendString:[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]];
    }

}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(nullable NSString *)namespaceURI qualifiedName:(nullable NSString *)qName{
    
    if([elementName isEqualToString:@"formatted_address"]){
        [self.results addObject:self.parsedString];
        
        self.parsedString=nil;
    }

}