ios Coredata大集插入

Question

嘿，我被同样的问题困扰了好几天，插入时间逐渐增加，在较低的 ipad 中它也会因内存问题而崩溃。插入 20k 记录需要 4-5 分钟。后台线程会提高效率吗？ ？无论如何我可以优化这个。如果可以，请帮忙。

  +(BOOL) addObjectToProfessionalsDBWithDict:(NSArray*)profArray{

if (!([profArray count]>0 && profArray )) {
    return NO;
}

NSManagedObjectContext *thisContext=[self getManagedObjectContext];


for (int i=0; i<[profArray count]; i++) {
  NSManagedObject *professionalDBObject = [NSEntityDescription
    insertNewObjectForEntityForName:@"ProfessionalsDB"
                                          inManagedObjectContext:thisContext];//initWithDictionary:objectDict];        NSMutableDictionary * objectDict=[profArray objectAtIndex:i];
 [professionalDBObject setValue:[objectDict valueForKey:@"Degree"] forKey:@"degree"];
[professionalDBObject setValue:[objectDict valueForKey:@"First_Name"] 
  // and 10 more  values  

     if(i%500==0){
        NSError *error;
        NSLog(@"saved rec nu %d",i);
        if (![thisContext save:&error]) {
            NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]);
            return NO;
        }
        else{
            NSLog(@"data saved");

        }

         [thisContext reset];


   }

}



[prefs setInteger:numOfRecords forKey:@"numberOfRecords"];
NSError *error;


if (![thisContext save:&error]) {
    NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]);
    return NO;
}

return YES;

Answer 1

存储 20k 条记录大约需要 4 分钟。我用下面的代码把它减少到 8 秒(这真的很棘手!):

  +(NSManagedObjectContext*)getInsertContext{
NSManagedObjectContext *thisContext=[[NSManagedObjectContext alloc] init];
AppDelegate *delegate=(AppDelegate*)[[UIApplication sharedApplication] delegate];
NSPersistentStoreCoordinator *coordinator = [delegate persistentStoreCoordinator];
[thisContext setPersistentStoreCoordinator:coordinator];
[thisContext setUndoManager:nil];

return thisContext;

我在此上下文中保存的每 1000 条记录，在保存重置并再次获取新上下文后:

    [thisContext reset];
        thisContext=[self getInsertContext];