将数据插入核心数据模型的速度慢得令人无法接受

您可能应该实例化上下文并将其保存在for之外,它应该如下所示:

func loadDataBase() {

    let mainDelegate = UIApplication.shared.delegate as! AppDelegate
    let context = mainDelegate.persistentContainer.viewContext

    for i in 1..<objectArray.count - 1 {

        let item: [String] = objectArray[i]


        s_stop_id = Int(item[0])
        s_stop_code = Int(item[1])
        s_stop_name = item[2]



        let newResource = NSEntityDescription.insertNewObject(forEntityName: stopEntity, into: context)

        newResource.setValue(s_stop_id, forKey: "stop_id")
        newResource.setValue(s_stop_name, forKey: "stop_name")
        newResource.setValue(s_stop_code, forKey: "stop_code")
    }
    do {
            try context.save()

        } catch let error as NSError  {
            print("Error While Saving Data: \(error.userInfo)")
        }
}

使用测试以下内容 autoreleasepool 。

let mainDelegate = UIApplication.shared.delegate as! AppDelegate
let context = appDelegate.persistentContainer.viewContext
let newResource = NSEntityDescription.insertNewObject(forEntityName: stopEntity, into: context)

for i in 1..<objectArray.count - 1 {
    autoreleasepool(invoking: { () -> () in
        let item: [String] = self.objectArray[i]
        s_stop_id = Int(item[0])
        s_stop_code = Int(item[1])
        s_stop_name = item[2]
        newResource.setValue(s_stop_id, forKey: "stop_id")
        newResource.setValue(s_stop_name, forKey: "stop_name")
        newResource.setValue(s_stop_code, forKey: "stop_code")

        do {
            try context.save()
        } catch let error as NSError  {
            print("Error While Saving Data: \(error.userInfo)")
        }    
    })
}