Coredata提取请求与序列顺序

Question

我正在使用核心数据并基于ID数组获取结果。这个ID数组是我需要获取的序列。但是取得的结果不是这样的顺序。我应该怎么做才能获取完全匹配ID数组顺序的对象？

// get manageObjectContext 
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate]; 
NSManagedObjectContext *context = [appDelegate managedObjectContext]; 

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; 
NSEntityDescription *entity = [NSEntityDescription entityForName:@"SomeName" 
              inManagedObjectContext:context]; 
[fetchRequest setEntity:entity]; 

fetchRequest.predicate = [NSPredicate predicateWithFormat:@"%K IN %@", @"anId", arr]; 

NSError *error; 
NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error]; 
fetchRequest = nil; 

Answer 1

使用

fetchRequest.sortDescriptors = NSSortDescriptor(key: "anId", ascending: true or false)