仅打印最后一个实体(swift4)的coreData

import CoreData

// 创建NSPersistentContainer
lazy var persistentContainer: NSPersistentContainer = {
    let container = NSPersistentContainer(name: "YourDataModelName")
    container.loadPersistentStores(completionHandler: { (storeDescription, error) in
        if let error = error as NSError? {
            fatalError("Unresolved error \(error), \(error.userInfo)")
        }
    })
    return container
}()

// 获取NSManagedObjectContext
lazy var managedObjectContext: NSManagedObjectContext = {
    return persistentContainer.viewContext
}()

// 查询最后一个实体
func fetchLastEntity() -> YourEntity? {
    let fetchRequest: NSFetchRequest<YourEntity> = YourEntity.fetchRequest()
    let sortDescriptor = NSSortDescriptor(key: "yourSortAttribute", ascending: false)
    fetchRequest.sortDescriptors = [sortDescriptor]
    fetchRequest.fetchLimit = 1
    
    do {
        let entities = try managedObjectContext.fetch(fetchRequest)
        return entities.first
    } catch {
        print("Failed to fetch entities: \(error)")
        return nil
    }
}

// 打印最后一个实体的属性
if let lastEntity = fetchLastEntity() {
    print(lastEntity.yourAttribute)
}