Question

它是从某个网站获取天气信息的程序的一部分。进入程序我使用singleton获取Core Data上下文。 AirportsICA和AirportsData是核心数据子类。此函数必须解析页面并将所有数据保存到Core Data上下文，它在解析数据时工作正常，但在尝试将结果保存到数据库时抛出错误。怎么解决？有任何想法吗。

2017-03-16 23：56：21.197036天气应用[3603：81353] [通用] _BSMachError：端口700f; （os / kern）无效功能（0x14）“无法插入COPY_SEND”

2017-03-16 23：56：21.197265 Weather App [3603：81353] [Common] _BSMachError：port 700f; （os / kern）无效名称（0xf）“无法解除分配发送权”

    func getData(forICAO icaoCode: String) -> Bool {

    let config = URLSessionConfiguration.default
    let apiKey = "zzzzzzzzz-zzzz-zzzz-zzzz-zzzzzz"
    let url = URL(string: "https://somesite.com/current-conditions-list?api_key=" + apiKey + "&airports=" + icaoCode + "&states=&format=json")
    let session = URLSession(configuration: config)


    let task = session.dataTask(with: url!) { (data, responce, error) in



        if error == nil && data != nil {
            if let parsedDataArray = try? JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as! Array<Any> {
                if let parsedData = parsedDataArray[0] as? Dictionary<String, Any> {
                    guard let airport = parsedData["airport"] as? String else { return }
                    guard let airport_name = parsedData["airport_name"] as? String else { return }
                    let updatedByUser = Date()

                    // Core Data
                        let context = CoreDataManager.instance.persistentContainer.viewContext
                        let entityForAirportICAO = NSEntityDescription.entity(forEntityName: "AirportsData", in: context)
                        let airportICAO = AirportsICAO(entity: entityForAirportICAO!, insertInto: context)

                        airportICAO.airport = airport
                        airportICAO.airport_name = airport_name
                        airportICAO.updatedByUser = updatedByUser

                        try! context.save()
                }
            }
        }
    }

    task.resume()
    return true
}

Answer 1

在后台队列上调用URLSession.dataTask(with:completionHandler:)的完成处理程序块，但是您正在从该块访问视图上下文。只应从主线程访问视图上下文。

相反，您应该使用后台任务：

CoreDataManager.instance.persistentContainer.performBackgroundTask() { context in

    let entityForAirportICAO = NSEntityDescription.entity(forEntityName: "AirportsData", in: context)
    let airportICAO = AirportsICAO(entity: entityForAirportICAO!, insertInto: context)

    airportICAO.airport = airport
    airportICAO.airport_name = airport_name
    airportICAO.updatedByUser = updatedByUser

    try! context.save()
}

无法将已解析的数据保存到URLSession到Core Data上下文（iOS 10，Swift 3）

1 个答案: