ios - 如何在 swift 2 中更新多个核心数据属性

Question

我想使用 swift 更新实体的多个属性，但找不到任何教程来管理它。我已成功使用以下代码更新实体的单个属性:

   //Insert Function
func Insert(dbname : String , attributeName : String , value : String ) {
    let check_empty = entityIsEmpty(dbname)
    if(check_empty != true){

    let saveData = NSEntityDescription.insertNewObjectForEntityForName(dbname, inManagedObjectContext: managedContext)

    // add our data
    saveData.setValue(value, forKey: attributeName)

    //2
    do {
        try managedContext.save()
        //3
        check_DB.append(saveData)

    } catch let error as NSError  {
        print("Could not save \(error), \(error.userInfo)")
    }

    //check_empty
}else{
        //Update procedure
        let fetchRequest = NSFetchRequest(entityName: dbname)

        do {
            let fetchedEntities = try self.managedContext.executeFetchRequest(fetchRequest) as! [SettingInfo]
            fetchedEntities.first?.attributeName = value

            // ... Update additional properties with new values
        } catch {
            // Do something in response to error condition
        }

        do {
            try self.managedContext.save()

        } catch {
            // Do something in response to error condition
        }

}

但是如何更新实体的多个属性？例如:实体名称是:dbname属性名称为:attribute_name我要更新的属性的值是:value

更新:错误消息:

我的数据库结构:

Answer 1

您可以使用对 NSManagedEntities 的键控访问，因此您可以说

if let entity = fetchedEntities.first {
    entity[attribute_name]=value
}