Question

因此，我试图在我的应用程序中添加一些功能，如果我按下+按钮，我将被发送到页面。该页面将用于设置要放置在列表中的新项目。

但是，每当我按下+按钮时，都会出现this class is not key value coding-compliant for the key dueDateField.错误。我已经研究过，似乎与某些已删除的按钮有关。尽管错误文字说明它与dueDateField有关。

到目前为止，我已经尝试恢复已删除的按钮，并且仍然出现相同的错误。该按钮与dueDateField不相关。每次删除按钮时，我也会使用该按钮删除该操作。我还尝试取消对dueDateField的注释，以查看它是否会产生一些不同的错误，但是没有。

ToDoViewController.swift

import UIKit

class ToDoViewController: UIViewController, UITextFieldDelegate {
    // MARK: Properties
    @IBOutlet weak var toDoNameField: UITextField!
    @IBOutlet weak var workOnField: UITextField!
    @IBOutlet weak var startTimeField: UITextField!
    @IBOutlet weak var dueDateField: UITextField!
    @IBOutlet weak var estTimeField: UITextField!

    @IBOutlet weak var toDoNameLabel: UILabel!
    @IBOutlet weak var workOnLabel: UILabel!
    @IBOutlet weak var startTimeLabel: UILabel!
    @IBOutlet weak var dueDateLabel: UILabel!
    @IBOutlet weak var estTimeLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Handles the changes for the labels through user input
        toDoNameField.delegate = self
        workOnField.delegate = self
        startTimeField.delegate = self
        dueDateField.delegate = self
        estTimeField.delegate = self
    }

    // MARK: UITextFieldDelegate
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        // Hide the keyboard.
        textField.resignFirstResponder()
        return true
    }

    func textFieldDidEndEditing(_ textField: UITextField) {
        // Determines which of the textfield is it working
        switch(textField) {
        case workOnField:
            workOnLabel.text = "Work On: " + textField.text!
        case startTimeField:
            startTimeLabel.text = "Start Time: " + textField.text!
        case dueDateField:
            dueDateLabel.text = "Due Date: " + textField.text!
        case estTimeField:
            estTimeLabel.text = "Est. Time: " + textField.text!
        default:
            toDoNameLabel.text = textField.text
        }
    }

    // MARK: Actions
    /*@IBAction func setDefaultTodoName(_ sender: UIButton) {
        toDoNameLabel.text = "Default ToDo Name"
    }*/
}

ToDo.swift

import UIKit

class ToDo {
    // MARK: Properties
    var toDoName, workOnDate, startTime, dueDate, estTime: String

    // MARK: Initializers
    init?(toDoName: String, workOnDate: String, startTime: String,
         dueDate: String, estTime: String) {
        // Initialization should fail if either one of these items are set
        if toDoName.isEmpty || workOnDate.isEmpty || startTime.isEmpty
            || dueDate.isEmpty || estTime.isEmpty {
            return nil
        }
    }
}

ToDoTableViewCell.swift

import UIKit

class ToDoTableViewCell: UITableViewCell {
    // MARK: Properties
    @IBOutlet weak var startTimeLabel: UILabel!
    @IBOutlet weak var toDoNameLabel: UILabel!
    @IBOutlet weak var dueDateLabel: UILabel!
    @IBOutlet weak var estTimeLabel: UILabel!


    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }

}

ToDoTableViewController.swift

import UIKit

class ToDoTableViewController: UITableViewController {
    // MARK: Properties
    var toDos = [ToDo]()

    override func viewDidLoad() {
        super.viewDidLoad()

        // Load the sample toDo data
        loadSampleToDos()
    }

    // MARK: - Table view data source

    override func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // Returns how many rows will be there for the list of Todos
        return toDos.count
    }


    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        // Table view cells are reused when the user and should be dequeued using a cell identifer.
        let cellIdentifier = "ToDoTableViewCell"

        guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? ToDoTableViewCell else {
            fatalError("The dequeued cell is not an instance of ToDoTableViewCell.")
        }

        // Retrieves the correct toDo for the layout of the data sourcer
        let toDo = toDos[indexPath.row]

        cell.toDoNameLabel.text = toDo.toDoName
        cell.startTimeLabel.text = toDo.startTime
        cell.dueDateLabel.text = toDo.dueDate
        cell.estTimeLabel.text = toDo.estTime

        return cell
    }

    // MARK: Private Methods
    private func loadSampleToDos() {
        // Sample todo items
        guard let toDo1 = ToDo(toDoName: "Check my calendar", workOnDate: "5/24", startTime: "4:00 PM", dueDate: "6/07", estTime: "3 Hours") else {
            fatalError("Unable to instantiate toDo1")
        }
        guard let toDo2 = ToDo(toDoName: "Watch a Game", workOnDate: "5/27", startTime: "5:00 PM", dueDate: "6/10", estTime: "1 Hour") else {
            fatalError("Unable to instantiate toDo2")
        }
        guard let toDo3 = ToDo(toDoName: "Write a Story", workOnDate: "5/30", startTime: "4:30 PM", dueDate: "6/07", estTime: "1.5 Hour") else {
            fatalError("Unable to instantiate toDo3")
        }

        toDos += [toDo1, toDo2, toDo3]
    }
}

这是错误消息：

2019-06-13 23：17：14.754529-0500 ToDoNix [4333：171304] Interface Builder文件中的未知类_TtC7ToDoNix14ViewController。 2019-06-13 23：17：14.786783-0500 ToDoNix [4333：171304] *由于未捕获的异常'NSUnknownKeyException'而终止应用程序，原因：'[ setValue：forUndefinedKey：]：此类不是键值符合密钥DueDateField的编码要求。” * 第一个调用堆栈：（ 0 CoreFoundation 0x0000000107f601bb exceptionPreprocess + 331 1 libobjc.A.dylib 0x00000001065a3735 objc_exception_throw + 48 2 CoreFoundation 0x0000000107f5fd29-[NSException提高] + 9 3基础0x0000000105fcede4-[NSObject（NSKeyValueCoding）setValue：forKey：] + 292 4 UIKitCore 0x000000010a363292-[UIViewController setValue：forKey：] + 87 5 UIKitCore 0x000000010a5fa573-[UIRuntimeOutletConnection连接] + 109 6 CoreFoundation 0x0000000107f4bcfd-[NSArray makeObjectsPerformSelector：] + 317 7 UIKitCore 0x000000010a5f72b9-[UINib InstantiateWithOwner：options：] + 1814 8 UIKitCore 0x000000010a36a452-[UIViewController _loadViewFromNibNamed：bundle：] + 383 9 UIKitCore 0x000000010a36addc-[UIViewController loadView] + 177 10 UIKitCore 0x000000010a36b0ee-[UIViewController loadViewIfRequired] + 175 11 UIKitCore 0x000000010a36b940-[UIViewController视图] + 27 12 UIKitCore 0x000000010a2b5a9b-[UINavigationController _startCustomTransition：] + 931 13 UIKitCore 0x000000010a2cc3f0-[UINavigationController _startDeferredTransitionIfNeeded：] + 741 14 UIKitCore 0x000000010a2cd7e0-[UINavigationController __viewWillLayoutSubviews] + 150 15 UIKitCore 0x000000010a2ad600-[UILayoutContainerView layoutSubviews] + 217 16 UIKitCore 0x000000010ae74795-[UIView（CALayerDelegate）layoutSublayersOfLayer：] + 1441 17 QuartzCore 0x000000010c3fcb19-[CALayer layoutSublayers] + 175 18 QuartzCore 0x000000010c4019d3 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 395 19 QuartzCore 0x000000010c37a7ca _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 342 20 QuartzCore 0x000000010c3b197e _ZN2CA11Transaction6commitEv + 576 21 UIKitCore 0x000000010a984701 _UIApplicationFlushRunLoopCATransactionIfTooLate + 165 22 UIKitCore 0x000000010aa7e569 __handleEventQueueInternal + 6874 23 CoreFoundation 0x0000000107ec5721 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 24 CoreFoundation 0x0000000107ec4f93 __CFRunLoopDoSources0 + 243 25 CoreFoundation 0x0000000107ebf63f __CFRunLoopRun + 1263 26 CoreFoundation 0x0000000107ebee11 CFRunLoopRunSpecific + 625 27图形服务0x000000011011b1dd GSEventRunModal + 62 28 UIKitCore 0x000000010a98a81d UIApplicationMain + 140 29 ToDoNix 0x0000000105c6c917主+ 71 30 libdyld.dylib 0x00000001094a7575开始+ 1 ） libc ++ abi.dylib：以类型为NSException的未捕获异常终止（lldb）

NSUnknownKeyException：此类与键DueDateField的键值编码不兼容。'

0 个答案: