这段代码为什么会崩溃？

Question

我正在加载一个XML file，其中包含大约600个小数据集，大约有10,000行。数据被用作地图上的注释点。我正在使用TouchXML库来处理XML。这里是我的代码：将XML文件下载

NSData *XMLData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://skidmoreapps.com/darksky/fetch_info.php"]]; 
CXMLDocument *doc = [[[CXMLDocument alloc] initWithData:XMLData options:0 error:nil] autorelease]; 
NSArray *nodes = [doc nodesForXPath:@"//site" error:nil]; 

for (CXMLElement *node in nodes) 
{ 
    ObservationSite *site = [ObservationSite mapAnnotation]; 
    [site setCoordinate:CLLocationCoordinate2DMake([[[[node elementsForName:@"lat"] objectAtIndex:0] stringValue] floatValue], [[[[node elementsForName:@"lng"] objectAtIndex:0] stringValue] floatValue])]; 
    [site setTitle:[[[node elementsForName:@"name"] objectAtIndex:0] stringValue]]; 
    [site setAddress:[[[node elementsForName:@"address"] objectAtIndex:0] stringValue]]; 
    [site setUrl:[[[node elementsForName:@"name_l"] objectAtIndex:0] stringValue]]; 
    [site setAffiliation:[[[node elementsForName:@"affil"] objectAtIndex:0] stringValue]]; 
    [site setAffiliationUrl:[[[node elementsForName:@"affil_l"] objectAtIndex:0] stringValue]]; 
    [site setOwner:[[[node elementsForName:@"owner"] objectAtIndex:0] stringValue]]; 
    [site setFee:[[[node elementsForName:@"fee"] objectAtIndex:0] stringValue]]; 
    [site setAccess:[[[node elementsForName:@"access"] objectAtIndex:0] stringValue]]; 
    [site setSky:[[[node elementsForName:@"sky"] objectAtIndex:0] stringValue]]; 
    [site setWeatherUrl:[[[node elementsForName:@"wx_l"] objectAtIndex:0] stringValue]]; 
    [site setPads:[[[node elementsForName:@"pads"] objectAtIndex:0] stringValue]]; 
    [site setParking:[[[node elementsForName:@"parking"] objectAtIndex:0] stringValue]]; 
    [site setRestrooms:[[[node elementsForName:@"b_rooms"] objectAtIndex:0] stringValue]]; 
    [site setSleep:[[[node elementsForName:@"sleep"] objectAtIndex:0] stringValue]]; 
    [site setNotes:[[[node elementsForName:@"notes"] objectAtIndex:0] stringValue]]; 

    [map addAnnotation:site]; 
} 

后，它崩溃，出现此错误：

Answer 1

从截图中我可以看到，有一个mutateError发生的历史。如果你修改你正在枚举的东西，这可能发生在快速枚举过程中。在快速枚举正在运行的同时，是否会发生什么情况会修改[self children]集合？例如，是否有多个线程处理事务？

如果您继续调试程序并允许异常完全抛出，您在控制台上看到了什么？

顺便说一下，您的.php脚本似乎正在返回一个无效的XML文档 - 有些字符不是有效的UTF8，就我的浏览器而言。也许不是问题，但值得修复和排除。