iOS xml解析

xml解析@property (nonatomic, strong) NSMutableArray *dataList;// 来回拼接@property (nonatomic, strong) NSMutableString *elementString;// 当前视频信息的对象@property (nonatomic, strong) Video *v;//创建并调用NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];parser.delegate = self;[parser parse];#pragma mark 1. 开始- (void)parserDidStartDocument:(NSXMLParser *)parser{    NSLog(@"开始文档");    // 准备工作    // 1> dataList    if (!self.dataList) {        self.dataList = [NSMutableArray array];    } else {        [self.dataList removeAllObjects];    }        // 2> elementString    if (!self.elementString) {        self.elementString = [NSMutableString string];    } else {        // 清空可变字符串不要设置成nil,使用setString只是清空内容,下次不会再次实例化        [self.elementString setString:@""];    }}#pragma mark 2. 所有开始一个节点:<element>- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{    NSLog(@"开始节点:%@ %@", elementName, attributeDict);    // 如果是<video>新建对象    if ([elementName isEqualToString:@"video"]) {        self.v = [[Video alloc] init];        self.v.videoId = attributeDict[@"videoId"];    }        // 每开始一个新节点之前都清空elementString    // 避免上一次的结果被重复拼接,例如拼完名字是"abc",再拼长度就会变成"vda1234"    [self.elementString setString:@""];}#pragma mark 3. 查找内容,可能会重复多次- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{    // 拼接字符串    [self.elementString appendString:string];}#pragma mark 4. 节点结束 </element>- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{    NSLog(@"结束节点 %@", elementName);    // 判断如果是<name>要复制    if ([elementName isEqualToString:@"video"]) {        [self.dataList addObject:self.v];    } else if (![elementName isEqualToString:@"videos"]) {        [self.v setValue:self.elementString forKey:elementName];    }}#pragma mark 5. 文档结束- (void)parserDidEndDocument:(NSXMLParser *)parser{    NSLog(@"解析结束 %@ %@", self.dataList, [NSThread currentThread]);        dispatch_async(dispatch_get_main_queue(), ^{        // 在iOS开发中用一个可变对象给不可变对象赋值时,使用copy是一个好习惯        self.videoList = [self.dataList copy];                // 关闭刷新控件的刷新        [self.refreshControl endRefreshing];    });}#pragma mark 6. 出错处理- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError{    NSLog(@"%@", parseError.localizedDescription);}