ios - NSXMLParser 代码的 EXC_BAD_ACCESS

Question

我已经编写了以下代码来解析 RSS 提要。 但是当它尝试将元素与 @"title"进行比较时，我在 foundCharacter 方法中不断收到 EXC_BAD_ACCESS 。知道我哪里出错了吗？

NSMutableDictionary * item;
NSMutableString * title;
NSMutableString * link;
NSString *element;
NSMutableArray *feeds; 

-(void) parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
    element = elementName;
    if ([element isEqualToString:@"item"]) {
        item = [[NSMutableDictionary alloc]init];
        title = [[NSMutableString alloc]init];
        link = [[NSMutableString alloc] init];
    }
}

-(void) parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
    if ([elementName isEqualToString:@"item"]) {
        [item setObject:title forKey:@"title"];
        [item setObject:link forKey:@"link"];
        [feeds addObject:[item copy]];
        NSLog(@"feeds :: %@",feeds);
    }


}

-(void) parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    if ([element isEqualToString:@"title"]) {
        [title appendString:string];`enter code here`
    }else if ([element isEqualToString:@"link"]){
        [link appendString:string];
    }
}

Answer 1

我认为错误在于这一行:

element = elementName;

您必须初始化变量元素。所以写这个:

element = [[NSString alloc] initWithString:elementName];

那么它应该可以工作了。