在视图控制器之间解析 JSON 数据

Posted 2023-02-24

【中文标题】在视图控制器之间解析 JSON 数据

【英文标题】：parsing JSON data between view controllers

【发布时间】：2017-05-23 23:43:48

【问题描述】：

此代码获取 JSON 数据并显示在此代码所在的视图控制器上。我试图弄清楚如何在另一个视图控制器上使用此页面的结果，这将大多数来自下面的第二个视图控制器的代码，我试图让代码的结果显示在上面。

      func paraseData()


    fetchedFiName = []

    let url = ""
    var request = URLRequest(url: URL(string: url)!)
    request.httpMethod = "GET"

    let configuration = URLSessionConfiguration.default
    let session = URLSession(configuration: configuration, delegate: nil, delegateQueue: OperationQueue.main)

    let task = session.dataTask(with: request)  (data, response, error) in
        if error != nil 
            print("Error")
        
        else

            do
                let fetchedData = try JSONSerialization.jsonObject(with: data!, options: .mutableLeaves) as! NSArray
                //print(fecthdata)

                for eachFetchedfiName in fetchedData 
                    let eachfiName = eachFetchedfiName as! [String :Any]
                    let fiName = eachfiName["financial_institution"] as! String
                    let oneYear = eachfiName["one_year"] as! String
                    let twoYear = eachfiName["two_year"] as! String
                    let threeYear = eachfiName["three_year"] as! String
                    let fourYear = eachfiName["four_year"] as! String
                    let fiveYear = eachfiName["five_year"] as! String


                    self.fetchedFiName.append(rates(fiName: fiName, oneYear: oneYear, twoYear: twoYear, threeYear: threeYear, fourYear: fourYear, fiveYear: fiveYear))

                

                //print(self.fetchedFiName)
                self.mtgRates.reloadData()


            

            catch
                print("Error 2")
            
        

    
    task.resume()




class rates 

var fiName: String
var oneYear: String
var twoYear: String
var threeYear: String
var fourYear: String
var fiveYear: String

init(fiName: String, oneYear: String, twoYear: String, threeYear: String, fourYear: String, fiveYear: String) 
    self.fiName = fiName
    self.oneYear = oneYear
    self.twoYear = twoYear
    self.threeYear = threeYear
    self.fourYear = fourYear
    self.fiveYear = fiveYear

这是我试图将结果传递给第二个视图控制器的代码。我正在尝试使用 JSON 数据中的贷方名称填充pickerview...我已经为这个问题苦苦挣扎了好几天...请思考。

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

    return fetchedFiName[row].fiName


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

    return fetchedFiName.count


func numberOfComponents(in pickerView: UIPickerView) -> Int 

    return 1


func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) 
    lenderName.text = fetchedFiName[row].fiName
    self.view.endEditing(false)

【参考方案1】：

Investigate 后续。离开当前视图控制器时，您可以在目标视图控制器上设置一个值。代码如下所示：

override func prepare(for segue: UIStoryboardSegue, sender: Any?) 
    let destinationViewController = segue.destination as! YourViewController
    destinationViewController.json = yourJSONObj