ios - 将XML返回的数据从ASMX Web服务加载到iPhone/iPad时崩溃

因此，在我的应用程序中，我从XML Web服务检索数据。它非常大。最多30-40000个记录。在模拟器上，它可以正常工作。但是在设备上它崩溃了。我使用NSXMLParser。 didStartElement，didEndElement。所以它在某个时候崩溃了。但是我在后台线程中这样做，以免破坏我的主线程。如果超过10秒，也可以停止iOS以停止淘汰我的应用程序。关于如何纠正它的任何想法。我一直在这个时候，但没有解决方案。任何帮助，将不胜感激。谢谢。

0   CoreFoundation                  0x3baa839c __CFBasicHashAddValue + 1452
1   CoreFoundation                  0x3b9d2194 CFBasicHashAddValue + 3048
2   CoreFoundation                  0x3b9d5ebc CFSetAddValue + 112
3   CoreData                        0x3709b5b0 -[NSManagedObjectContext(_NSInternalAdditions) _insertObjectWithGlobalID:globalID:] + 172
4   CoreData                        0x370939bc -[NSManagedObjectContext insertObject:] + 136
5   CoreData                        0x370836d2 -[NSManagedObject initWithEntity:insertIntoManagedObjectContext:] + 646
6   CoreData                        0x3706fd74 +[NSEntityDescription insertNewObjectForEntityForName:inManagedObjectContext:] + 176
7   XYZ Orders                      0x00146c68 -[ITMParser parser:didEndElement:namespaceURI:qualifiedName:] (ITMParser.m:393)
8   Foundation                      0x36898a82 _endElementNs + 298
9   libxml2.2.dylib                 0x3ad8de5a xmlParseEndTag2 + 614
10  libxml2.2.dylib                 0x3ad8f546 xmlParseTryOrFinish + 1658
11  libxml2.2.dylib                 0x3ad8ece8 xmlParseChunk + 208
12  Foundation                      0x3689755e -[NSXMLParser parse] + 482
13  XYZ Orders                      0x0017a4c4 -[ITMLoginVC getAllCustomerValues] (ITMLoginVC.m:822)
14  XYZ Orders                      0x00176a6c __25-[ITMLoginVC viewDidLoad]_block_invoke_0 (ITMLoginVC.m:218)
15  libdispatch.dylib               0x39d8011c _dispatch_call_block_and_release + 8
16  libdispatch.dylib               0x39d8495c _dispatch_root_queue_drain + 248
17  libdispatch.dylib               0x39d84abc _dispatch_worker_thread2 + 80
18  libsystem_c.dylib               0x36ae9a0e _pthread_wqthread + 358
19  libsystem_c.dylib               0x36ae98a0 start_wqthread + 4


- (void) parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
if([elementName isEqualToString:@"NAllAddresses"])
{
    NSString *temp=@"";
    self.managedObjectContext = appDelegate.managedObjectContext;
         //The below line happens to be the line number 393.
    ITMAllCustomerAddresses *allCustAddress =(ITMAllCustomerAddresses *)[NSEntityDescription
                                                        insertNewObjectForEntityForName:@"ITMAllCustomerAddresses"
                                                                      inManagedObjectContext:self.managedObjectContext];
    allCustAddress.allAddID = [self numberValue:[self.mutableDictionary objectForKey:@"AllAddID"]];
    allCustAddress.allCustID = [self numberValue:[self.mutableDictionary objectForKey:@"AllCustID"]];

    temp =[self.mutableDictionary objectForKey:@"AllAddressLine"];
    allCustAddress.allAddressLine = [self noSpaceString:temp];

    temp = [self.mutableDictionary objectForKey:@"AllAddressCity"];
    allCustAddress.allAddressCity = [self noSpaceString:temp];

    temp = [self.mutableDictionary objectForKey:@"AllAddressState"];
    allCustAddress.allAddressState = [self noSpaceString:temp];

    temp = [self.mutableDictionary objectForKey:@"AllAddressZip"];
    allCustAddress.allAddressZip = [self noSpaceString:temp];

    [self.allCustomerAddressesArray addObject:allCustAddress];
    [self.mutableDictionary removeAllObjects];
}
else
{
    if([elementName isEqualToString:@"AllAddID"]||[elementName isEqualToString:@"AllCustID"] ||[elementName isEqualToString:@"AllAddressLine"]||[elementName isEqualToString:@"AllAddressCity"]||[elementName isEqualToString:@"AllAddressState"]||[elementName isEqualToString:@"AllAddressZip"])
    {
        [self.mutableDictionary setObject:currentElementValue forKey:elementName];
        currentElementValue = nil;
    }
}

最佳答案

您是否调查过设备的崩溃日志？好像是由于设备内存不足而崩溃。尝试解析较小的文件。另外，实现此方法:

- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError

捕获可能的解析错误。

更新:

从崩溃日志判断，您正在后台线程上使用Core Data。请记住，NSManagedObjectContext和NSManagedObject不是线程安全的。但是NSManagedObjectID是。因此，如果要解析XML并从中创建Core Data对象，请确保像这样创建新的NSManagedObjectContext实例:

NSManagedObjectContext *ctx = [[NSManagedObjectContext alloc] init];
[ctx setUndoManager:nil];

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
[ctx setPersistentStoreCoordinator: [appDelegate persistentStoreCoordinator]];

然后使用ctx创建新对象。