在swift中优雅地迭代CoreData关系？

import CoreData

// 创建NSFetchedResultsController
let fetchRequest: NSFetchRequest<Entity> = Entity.fetchRequest()
let sortDescriptor = NSSortDescriptor(key: "attribute", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptor]

let fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest,
                                                          managedObjectContext: context,
                                                          sectionNameKeyPath: nil,
                                                          cacheName: nil)

// 设置代理
fetchedResultsController.delegate = self

// 执行查询
do {
    try fetchedResultsController.performFetch()
} catch {
    print("Fetch error: \(error.localizedDescription)")
}

// 迭代结果
if let entities = fetchedResultsController.fetchedObjects {
    for entity in entities {
        // 处理每个实体对象
    }
}