NSXMLParser

使用步骤

// 传入XML数据，创建解析器
NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
// 设置代理，监听解析过程
parser.delegate = self;
// 开始解析
[parser parse];

NSXMLParser采取的是SAX方式解析，特点是事件驱动，下面情况都会通知代理

当扫描到文档（Document）的开始与结束
当扫描到元素（Element）的开始与结束

NSXMLParserDelegate

@protocol NSXMLParserDelegate <NSObject>

@optional
- (void)parserDidStartDocument:(NSXMLParser *)parser;    // sent when the parser begins parsing of the document.当扫描到文档的开始时调用（开始解析）
- (void)parserDidEndDocument:(NSXMLParser *)parser;    // sent when the parser has completed parsing. If this is encountered, the parse was successful.当扫描到文档的结束时调用（解析完毕）
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(nullable NSString *)namespaceURI qualifiedName:(nullable NSString *)qName attributes:(NSDictionary<NSString *, NSString *> *)attributeDict;
  //当扫描到元素的开始时调用（attributeDict存放着元素的属性）
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(nullable NSString *)namespaceURI qualifiedName:(nullable NSString *)qName;    // sent when an end tag is encountered. The various parameters are supplied as above.当扫描到元素的结束时调用

@end

原生API解析XML

- (void) parserDatabyNSXMLParser:(NSData*)data{
    // 传入XML数据，创建解析器
    NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
    //  设置代理，监听解析过程
    parser.delegate = self;
    NSLog(@"-----begin%s",__func__);
    // 开始解析
    [parser parse];//Starts the event-driven parsing operation.
}
#pragma  mark - NSXMLParserDelegate
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(nullable NSString *)namespaceURI qualifiedName:(nullable NSString *)qName attributes:(NSDictionary<NSString *, NSString *> *)attributeDict{
   //    NSLog(@"%s---elementName:%@------namespaceURI:%@--qualifiedName%@----attributeDict:%@",__func__,elementName,namespaceURI,qName,attributeDict);
    if ([elementName isEqualToString:@"videos"]) {
        return;
    }else if ([elementName isEqualToString:@"video"]){
        [self.videos addObject:[HSVideoModel videoWithDictionary:attributeDict]];
    }
}