Question

我正在从webservice（15.000地址）下载地址列表。获取所有地址大约需要800ms，并且需要额外的15秒才能将它们写入CoreData。如果我错了，请给出一些建议：

AppDelegate *delegate = [[UIApplication sharedApplication] delegate];
            NSManagedObjectContext *managedObjectContext = delegate.managedObjectContext;
            for (NSDictionary *dict in addresses) {
                [self saveAddressesToCoreDataWithDictionary:dict andManagedObject:managedObjectContext];
            }
            [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"alreadyDownloaded"];

方法：

-(void)saveAddressesToCoreDataWithDictionary:(NSDictionary *)dict andManagedObject:(NSManagedObjectContext *)managedObject
{

    NSManagedObject *address;
    address = [NSEntityDescription insertNewObjectForEntityForName:@"Address" inManagedObjectContext:managedObject];

    [address setValue:[[dict objectForKey:@"lat"] stringValue] forKey:@"lat"];
    [address setValue:[[dict objectForKey:@"lon"] stringValue] forKey:@"lon"];
    [address setValue:[dict objectForKey:@"addressLong"] forKey:@"addressLong"];
    [address setValue:[dict objectForKey:@"addressShort"] forKey:@"addressShort"];
    NSError *error;
    [managedObject save:&error];

}

Answer 1

想通了！

问题是我每次都在保存managedObjectContext，只有在迭代完成后才能保存它。

刚刚移动了这一行：

if ([managedObjectContext save:&error] == NO) {
                NSAssert(NO, @"Error saving context: %@\n%@", [error localizedDescription], [error userInfo]);
            }

下面的循环。

CoreData写入对象慢

1 个答案: