0

我正在尝试获取UIPickerView 运行 App 时的选定值。但我得到错误，

致命错误：索引超出范围

我通过函数进行print("selected ==>\(selected)")调试 。我通过调试numberOfRowsInComponent得到的值为0。selected

如何解决这个问题呢？

Value From Postman
- Plandate function
http://xxx.xxx.xxx.xx/ProjectService/PODService.svc/GetPlanDate/2
"[  {    \"PlanDate\": \"26/08/2019\",    \"PlanDateFullFormat\": \"20190826\"  },  {    \"PlanDate\": \"27/08/2019\",    \"PlanDateFullFormat\": \"20190827\"  }]"

- PlanShipment
http://xxx.xxx.xxx.xx/ProjectService/PODService.svc/GetShipment/2/20190826
"[  {    \"Shipment\": \"4505023278\"  },  {    \"Shipment\": \"4505023279\"  }]"
http://xxx.xxx.xxx.xx/ProjectService/PODService.svc/GetShipment/2/20190827
"[  {    \"Shipment\": \"4505023244\"  },  {    \"Shipment\": \"4505023274\"  }]"

Return Value From JSON
- Plandate function
http://xxx.xxx.xxx.xx/ProjectService/PODService.svc/GetPlanDate/2
pplandateCategories ==>["20190826", "20190827"]

- PlanShipment
http://xxx.xxx.xxx.xx/ProjectService/PODService.svc/GetShipment/2/20190827
getpShipmentDCPlanData ==>["4505023244", "4505023274"]

Swift
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
      return 2
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if component == 0 {
            return pPlandateCategories.count
        }else{
            let selected = pickerview.selectedRow(inComponent:0)
           return pShipmentCategories[selected].count ———>. Thread 1: Fatal error: Index out of range
        }
    }

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        if component == 0 {
            return pPlandateCategories[row]
        }else{
            let selected = pickerview.selectedRow(inComponent:0)
            return pShipmentCategories[selected][row]
        }
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if component == 0{
            pickerview.reloadComponent(1)

        }else{
            let selected = pickerview.selectedRow(inComponent:0)
//            getpPlanDatePickerView.text = "PlanDate:" + " " + pplandateCategories[selected][row]
            someTextField.text = "Shipment:" + " " + pShipmentCategories[selected][row]
        }
    }

Error when Run Project 
My WebService ==> http://xxx.xxx.xxx.xx/ProjectService/PODService.svc/GetPlanDate/2GetPlanDate/2
Fatal error: Index out of range
2019-12-19 10:55:14.459056+0700 pickerDateAndShipment[782:19020] Fatal error: Index out of range
4

1 回答 1

0

仅当异步加载组件的数据并且在第一次重新加载表视图时数据源为空时，才会发生崩溃。

为了避免崩溃检查pShipmentCategories数组是否为空

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    if component == 0 {
        return pPlandateCategories.count
    } else {
        let selected = pickerview.selectedRow(inComponent:0)
        return pShipmentCategories.isEmpty ? 0 : pShipmentCategories[selected].count
    }
}
于 2019-12-19T11:37:34.280 回答