如何保存响应 JSON 数组并在 swift 中使用用户默认值进行检索

Posted 2023-02-24

【中文标题】如何保存响应 JSON 数组并在 swift 中使用用户默认值进行检索

【英文标题】：How to save response JSON array and retrieve using user default in swift

【发布时间】：2018-12-18 06:05:26

【问题描述】：

我想将 kode_pelaksanaan 保存在用户默认值中，并使用 SwiftyJSON 和 Alamofire 在第二个视图控制器中检索它。 这是我的代码

class ListSelfLearningViewController: UIViewController

     @IBOutlet weak var collectionView: UICollectionView!

     var listSelfLearning: [ListSelfLearningModel] = [] 

     override func viewDidLoad() 
     super.viewDidLoad()
     fetchData()
   


extension ListSelfLearningViewController: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
    return self.listSelfLearning.count


func numberOfSections(in collectionView: UICollectionView) -> Int 
    return 1


func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell 
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ListSelfLearningCollectionViewCell", for: indexPath) as! ListSelfLearningCollectionViewCell
    //cell.profileIv.image = listSelfLearning[indexPath.row].listImage
    cell.profileIv.sd_setImage(with: URL(string: listSelfLearning[indexPath.row].listImage))
    cell.title.text = listSelfLearning[indexPath.row].labelName
    return cell


func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize 
    return CGSize.init(width: UIScreen.main.bounds.width - 20, height: 250)


func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) 
    let storyboard: UIStoryboard = UIStoryboard(name: "Home", bundle: nil)
    let vc = storyboard.instantiateViewController(withIdentifier: "ListActivityViewController") as! ListActivityViewController
    navigationController?.pushViewController(vc, animated: true)


func fetchData()
    DispatchQueue.main.async 
        let url = URLs.listImage
        guard let user = helper.getApiUser() else return 

        guard let token = helper.getApiToken() else return 

        let parameter  = [
            "request": "\"requestMethod\":\"list_selflearning\",\"user\":\"\(user)\""

        ]

        let headers: HTTPHeaders = [
            "Content-Type" : "application/x-www-form-urlencoded",
            "Authorization" : "Bearer \(token)"
        ]

        Alamofire.request(url, method: .post, parameters: parameter, headers: headers).responseJSON(completionHandler:  (response) in
            switch response.result
            case .success(let value):
                let json = JSON(value)
                if let data = json["responseData"].array
                    for item in data
                        let images = item["image_detail"]["path_image"].string
                        let namaPelaksana = item["nama_pelaksanaan"].string

                        if let kode_pelaksanaan = item["kode_pelaksanaan"].string
                            helper.saveKodePelaksanaan(kode_pelaksanaan: kode_pelaksanaan)
                            print("nilai kode pelaksanaan: \(kode_pelaksanaan)")
                        

                        let listData = ListSelfLearningModel(listImage: images!, labelName: namaPelaksana!)
                        self.listSelfLearning.append(listData)

                    
                

                self.collectionView.reloadData()

            case .failure(let error):
                print(error)
            
        )
    

打印用户默认时的输出：

nilai kode pelaksanaan: ELR2018120005
nilai kode pelaksanaan: ELR2018120004
nilai kode pelaksanaan: ELR2018120003
nilai kode pelaksanaan: ELR2018120001
nilai kode pelaksanaan: ELR2018050004

但是当我在第二类中检索参数时，却没有像保存在 Userdefault 中那样得到输出。

这是我在第二个视图控制器中的代码：

import UIKit
import SwiftyJSON
import Alamofire
import SDWebImage

class ListActivityViewController: UIViewController 

@IBOutlet weak var tableView: UITableView!
var listActivity: [ListActivity] = []

override func viewDidLoad() 
    super.viewDidLoad()
    tableView.delegate = self
    tableView.dataSource = self
    // Do any additional setup after loading the view.
    let nibCell = UINib(nibName: "ListActivityTableViewCell", bundle: nil)
    tableView.register(nibCell, forCellReuseIdentifier: "ListActivityTableViewCell")
    fetchData()




    extension ListActivityViewController: UITableViewDataSource, UITableViewDelegate
func numberOfSections(in tableView: UITableView) -> Int 
    return 1


func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
    return listActivity.count


func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
    let cell = tableView.dequeueReusableCell(withIdentifier: "ListActivityTableViewCell", for: indexPath) as! ListActivityTableViewCell

    cell.title.text = listActivity[indexPath.row].pathImage
    return cell


func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) 
    let segueIdentifier: String
    switch indexPath.section 
    case 0:
        segueIdentifier = "webView"
    case 1:
        segueIdentifier = "ujian"
    default:
        segueIdentifier = ""
    
    self.performSegue(withIdentifier: segueIdentifier, sender: self)



override func prepare(for segue: UIStoryboardSegue, sender: Any?) 
    let indexPath = self.tableView.indexPathForSelectedRow

    switch indexPath?.section 
    case 0:
        let vc = segue.destination as! DetailPdfViewController
        let user = listActivity[(indexPath?.row)!]
        vc.webSite = user.pathPdf
    default:
        break
    

func fetchData()
    DispatchQueue.main.async 
        let url = URLs.listActivity
        guard let user = helper.getApiUser() else return 
        guard let token = helper.getApiToken() else return 
        guard let kodePelaksanaan = helper.getKodePelaksanaan() else return 

        print(kodePelaksanaan)

        let parameter =  [
            "request" : "\"requestMethod\":\"detail_selflearning\",\"user\":\"\(user)\",\"kode_pelaksanaan\":\"\(kodePelaksanaan)\""
        ]

        let headers: HTTPHeaders = [
            "Content-Type" : "application/x-www-form-urlencoded",
            "Authorization" : "Bearer \(token)"
        ]

        Alamofire.request(url, method: .post, parameters: parameter, encoding: URLEncoding.default, headers: headers).responseJSON(completionHandler:  (response) in

            switch response.result
            case .success(let value):
                let json = JSON(value)

                let data1 = json["responseData"]["data"]["materi_selflearning"]

                for item in data1.array!

                    if (item["jenis_materi"] == "2" || item["jenis_materi"] == "3" || item["jenis_materi"] == "99")

                        let image_detail = item["nama_pelaksanaan"].stringValue
                        let pdfDetail = item["path_file"].stringValue
                        let listActivitied = ListActivity(pathImage: image_detail, pathPdf: pdfDetail)

                        self.listActivity.append(listActivitied)
                        self.tableView.reloadData()
                    

                

            case .failure(let error):
                print(error)
            
        )

          
    
    

这是我在第二个视图控制器中得到的输出：

  nilai kode pelaksanaan: ELR2018050004

我想像这样在第二个视图控制器中获得输出：

  nilai kode pelaksanaan: ELR2018120005
  nilai kode pelaksanaan: ELR2018120004
  nilai kode pelaksanaan: ELR2018120003
  nilai kode pelaksanaan: ELR2018120001
  nilai kode pelaksanaan: ELR2018050004

这是我的班级助手：

  class helper: NSObject 
     class func saveKodePelaksanaan(kode_pelaksanaan: String)
    let def = UserDefaults.standard
    def.set(kode_pelaksanaan, forKey: "kode_pelaksanaan")
    def.synchronize()
   

  class func getKodePelaksanaan() -> String? 
    let def = UserDefaults.standard
    return def.object(forKey: "kode_pelaksanaan") as? String
    
  

【问题讨论】：

您正在使用相同的key 将项目（字符串值）一一保存到UserDefaults。因此，当您保存第二个字符串时，它会因为相同的键替换前一个字符串。因此，UserDefaults 中键 "kode_pelaksanaan" 的值是数组中的最后一个字符串。所以你需要将Array保存为一个整体并检索Array作为一个整体，否则你将不会得到相同的值。

那么如何将数组保存为一个整体并检索该数组整体呢？

save and retrieve array to user default using swift的可能重复

【参考方案1】：

希望这条消息能找到你

您正在尝试仅保存一个字符串，如下面的函数所示：-

class func saveKodePelaksanaan(kode_pelaksanaan: String)
let def = UserDefaults.standard
def.set(kode_pelaksanaan, forKey: "kode_pelaksanaan")
def.synchronize()

但函数参数中应该有字典或数组，如下所示

class func saveKodePelaksanaan(kode_pelaksanaan: array)
 let def = UserDefaults.standard
 def.set(kode_pelaksanaan, forKey: "kode_pelaksanaan")
 def.synchronize()

// 或

class func saveKodePelaksanaan(kode_pelaksanaan: dictionary)
 let def = UserDefaults.standard
 def.set(kode_pelaksanaan, forKey: "kode_pelaksanaan")
 def.synchronize()

你也应该在你的 for 循环完成时调用辅助类函数，而不是在循环执行时调用它自己，如下所示：-

    func fetchData()
    DispatchQueue.main.async 
        let url = URLs.listImage
        guard let user = helper.getApiUser() else return 

        guard let token = helper.getApiToken() else return 

        let parameter  = [
            "request": "\"requestMethod\":\"list_selflearning\",\"user\":\"\(user)\""

        ]

        let headers: HTTPHeaders = [
            "Content-Type" : "application/x-www-form-urlencoded",
            "Authorization" : "Bearer \(token)"
        ]

        Alamofire.request(url, method: .post, parameters: parameter, headers: headers).responseJSON(completionHandler:  (response) in
            switch response.result
            case .success(let value):
                let json = JSON(value)
                if let data = json["responseData"].array
                    for item in data
                        let images = item["image_detail"]["path_image"].string
                        let namaPelaksana = item["nama_pelaksanaan"].string

                        let listData = ListSelfLearningModel(listImage: images!, labelName: namaPelaksana!)
                        self.listSelfLearning.append(listData)

                    

                    // Changes are made here
                    helper.saveKodePelaksanaan(kode_pelaksanaan: self.listSelfLearning)

                

                self.collectionView.reloadData()

            case .failure(let error):
                print(error)
            
        )
    

如果你有任何问题，请与我分享，我会尽快更新。

【讨论】：

我收到错误我像这样更改 userDefault：class func saveKodePelaksanaan(kode_pelaksanaan: Array) let def = UserDefaults.standard def.set(kode_pelaksanaan, forKey: "kode_pelaksanaan") def.synchronize () // 此处进行更改 helper.saveKodePelaksanaan(kode_pelaksanaan: self.listSelfLearning)

这个错误：作为键 kode_pelaksanaan 的 NSUserDefaults/CFPreferences 值 2018-12-18 13:57:13.124702+0700 BRISM​​ART[4211:140578] *** 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序', 原因：'尝试插入非属性列表对象（“BRISM​​ART.ListSelfLearningModel(listImage: \"1.142.17.3/edu/uploads/ms_image/brismart_logo.png\", labelName: \"SIT\")"）为关键kode_pelaksanaan'

亲爱的 edo oktarifa，这是因为您传递了 Modal 数组（ ListSelfLearningModel ）。你能把你的项目发给我，这样我就可以做所有必要的更改并在每一行添加注释，否则你可以将你的数组传递给字典并保存该字典。

当然，我怎么能发给你。？通过电子邮件或 github？

我的邮箱是[e-mail]，或者你可以在github上与我分享，我的github id是[e-mail]，我的github用户名是harmandeep97等待项目

【参考方案2】：

您可以使用SwiftyUserDefaults