ios - pickerView 无法加载在同一 View Controller 中获取的数据(swift)

Question

我的 pickerview 无法从同一 View Controller 中获取的数组加载数据。但是，如果我将 fetchHistory 放入另一个 viewController(就在 historyViewController 之前)并通过导航发送数据，pickerView 会显示 confirms 数据。当我将 fetchHistory 放入 historyViewController 时，如何让它工作？或任何建议以某​​种方式放置 fetchHistory 而不是将其放入随机 viewController 的最佳方法？

历史 View Controller

var confirms = [DataWaitingConfirm]() //pickerView DataSource
override func viewDidLoad() {
    super.viewDidLoad()

    fetchHistory()//fetch data from server for 'confirms'
}

获取数据

func fetchHistory(){

    let headers = ["Authorization" : "\(TokenType!) \(Token!)"]
    Alamofire.request(.GET, "http://xxxx/history/", headers: headers, encoding: .JSON).responseJSON { response in
              switch response.result {
                  case .Success:
                     if let value = response.result.value {
                         let json = JSON(value)
                         print(json)
                         for (results,subJson):(String, JSON) in json["results"] {
                         print(subJson["status"].int)
                         if subJson["status"].intValue == 3 {
                             print("ada 3")
                             let orderReference = subJson["px_reference"].stringValue
                             let date = subJson["invoice_date_str"].stringValue
                             let totalPaid = subJson["total_paid"].stringValue

                             let orderPicker = "\(orderReference) \(date) \(totalPaid)"
                             let confirm = DataWaitingConfirm(orderReference: orderReference, pickerConfirm: orderPicker)
                             self.confirms += [confirm]
                                            }
                                        }}

            }
        case .Failure(let error):
            spinningActivity.hide(true)
            print(error)
            self.displayAlertMessage("could not fetch history")
        }
    }
}

pickerview 委托(delegate)

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {

    let orderToConfirm = confirms[row]
    return orderToConfirm.pickerConfirm
}

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {


    return confirms.count
}

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

}

Answer 1

您需要调用self.pickerView.reloadAllComponents() 来触发刷新。然后将再次调用数据源方法，您更新的数据将显示在选择器 View 中。

您的 Alamofire 请求异步返回，因此您应该在 self.confirms += confirm 之后触发重新加载。

注意:您还可以考虑使用 dispatch_async(dispatch_get_main_queue(), {...})

在主线程上触发它