Question

解析后我遇到了这个错误。 * 由于未捕获的异常'NSInvalidArgumentException'而终止应用程序，原因：' - [NSCFString stringValue]：无法识别的选择器发送到实例0x4b68480'

代码是

- （void）解析器：（NSXMLParser *）解析器didStartElement：（NSString *）elementName namespaceURI：（NSString *）namespaceURI qualifiedName：（NSString *）qName attributes：（NSDictionary *）attributeDict {

if([elementName isEqualToString:@"gallery"]){

}
else if ([elementName isEqualToString:@"asset"]){

    NSString *str ;
    str = [[attributeDict objectForKey:@"type"] stringValue];     <- HERE
    NSLog(@"type = %@",str);
    str = [[attributeDict objectForKey:@"thumbnail"] stringValue];      <- HERE
    NSLog(@"thumbnail = %@",str);
    str = [[attributeDict objectForKey:@"large"] stringValue];        <- HERE
    NSLog(@"large = %@",str);

}
 NSLog(@"Processing Element: %@",elementName);

}

XML树看起来像

“＆lt;”gallery ...“＆gt;” “＆lt;”asset type =“image”thumbnail =“/ ...”large =“/ ...”“＆gt;” ...

谢谢你的帮助！

Answer 1

错误显然[attributeDict objectForKey:...]已经返回NSString。因此，您无需致电stringValue来存储到str。即，而不是

str = [[attributeDict objectForKey:@"type"] stringValue];

你可以做到

str = [attributeDict objectForKey:@"type"];

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