在核心数据swift ios中使用未解析的标识符“模型”

Posted 2023-03-12

【中文标题】在核心数据swift ios中使用未解析的标识符“模型”

【英文标题】：Use of unresolved identifier "Model" in core data swift ios

【发布时间】：2018-01-12 05:39:32

【问题描述】：

我将数据保存在一个名为 Forms 的实体中，但是当我调用 Forms 时，它给了我错误 一切都很好，但突然发生错误，现在让我很恼火。我不知道为什么即使没有任何语法错误。

使用未解析的标识符“Forms”

这是我的代码

import UIKit
import CoreData

@available(ios 11.0, *)
class ViewViewController: UIViewController, UITableViewDelegate, UITableViewDataSource 
    // var getAddController : AddViewController = AddViewController()
    var fName : String?
    var fDesc : String?
    var formName : String?
    var results : [NSManagedObject] = []

    @IBOutlet weak var menu: UIBarButtonItem!
    @IBOutlet weak var viewTableView: UITableView!

    var manageObjectContext: NSManagedObjectContext!
    var eventArray = [Forms]()  // Where **Forms** is an model name

    let appDel = UIApplication.shared.delegate as! AppDelegate
    let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Forms")
    //var eventRequest: NSFetchRequest<Forms> = Forms.fetchRequest()

    func loadSaveData()  
        let eventRequest: NSFetchRequest<Forms> = Forms.fetchRequest()
        do
            eventArray = try manageObjectContext.fetch(eventRequest)
            self.viewTableView.reloadData()
        catch
        
            print("Could not load save data: \(error.localizedDescription)")
        
    

    ...
    table view methods here
    ...

    func moveToEdit() 
        let mainStoryBoard: UIStoryboard = UIStoryboard(name: "Main", bundle : nil)
        let desController = mainStoryBoard.instantiateViewController(withIdentifier: "EditViewController") as! EditViewController
        let newFrontViewController = UINavigationController.init(rootViewController:desController)
        revealViewController().pushFrontViewController(newFrontViewController, animated: true)
    

    override func viewDidLoad() 
        super.viewDidLoad()

        menu.target = revealViewController()
        menu.action = #selector(SWRevealViewController.revealToggle(_:))
        self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())

        let context = appDel.persistentContainer.viewContext
        results = try! context.fetch(request) as! [NSManagedObject]

        viewTableView.delegate = self
        viewTableView.dataSource = self
        viewTableView.reloadData()

        request.returnsObjectsAsFaults = false

        manageObjectContext = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
        self.loadSaveData()
    

更新

从var eventArray = [Forms]() 更改为 var eventArray : [NSManagedObject] = []

func loadSaveData() 中出现错误

 let eventRequest: NSFetchRequest<Forms> = Forms.fetchRequest()

使用未声明的类型“表单”

【问题讨论】：

将 var eventArray = [Forms]() 更改为 var eventArray : [NSManagedObject] = []

@Shezad 更新问题仍然错误

让 eventRequest: NSFetchRequest = Forms.fetchRequest() 让 eventRequest = NSFetchRequest(entityName: "Forms")

@Shezad 好心回答，以便我接受你的回答

【参考方案1】：

1.将你的 eventArray 类型更改为 NSManagedObject

var eventArray : [NSManagedObject] = []

2.为您的 loadSaveData() 方法更新代码。

func loadSaveData()  
    let eventRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Forms")
    do
        eventArray = try manageObjectContext.fetch(eventRequest) as! [NSManagedObject]
        self.viewTableView.reloadData()
    catch
    
        print("Could not load save data: \(error.localizedDescription)")