Food Tracker Tutorial Error

Question

Hi all, I'm new to all this so please keep that in mind while reading.

This is the code I am using; the file refuses to build because of line 16. The error says "Cannot assign value of type 'ViewController' to type 'UITextFieldDelegate?'".

//
//  ViewController.swift
//  FoodTracker
//
//

import UIKit

class ViewController: UIViewController {
    //MARK: Properties
    @IBOutlet weak var nameTextField: UITextField!
    @IBOutlet weak var mealNameLabel: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        nameTextField.delegate = self
        // Handle the text field’s user input through delegate callbacks.
    }
    //MARK: UITextFieldDelegate
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        //Hide the keyboard
        textField.resignFirstResponder()
        
        return true
    }
    
    func textFieldDidEndEditing(_ textField: UITextField) {
        mealNameLabel.text = textField.text
    }
    
    //MARK: Actions
    @IBAction func setDefaultLabelText(_ sender: UIButton) {
        mealNameLabel.text = "Default Text"
    }
    
}

Here is the full error output message.

020-04-09 14:19:12.897243-0400 FoodTracker[29402:868329] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<FoodTracker.ViewController 0x7ffaef406830> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key nameTypeField.'

*** First throw call stack:

(

0 CoreFoundation 0x00007fff23e3dcce __exceptionPreprocess + 350

1 libobjc.A.dylib 0x00007fff50b3b9b2 objc_exception_throw + 48

2 CoreFoundation 0x00007fff23e3d899 -[NSException raise] + 9

3 Foundation 0x00007fff258d5796 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 325

4 UIKitCore 0x00007fff485689b6 -[UIViewController setValue:forKey:] + 87

5 UIKitCore 0x00007fff48874ad3 -[UIRuntimeOutletConnection connect] + 109

6 CoreFoundation 0x00007fff23e29fe2 -[NSArray makeObjectsPerformSelector:] + 242

7 UIKitCore 0x00007fff48871cbc -[UINib instantiateWithOwner:options:] + 2192

8 UIKitCore 0x00007fff4856fdbe -[UIViewController _loadViewFromNibNamed:bundle:] + 379

9 UIKitCore 0x00007fff485708f5 -[UIViewController loadView] + 177

10 UIKitCore 0x00007fff48570bf4 -[UIViewController loadViewIfRequired] + 172

11 UIKitCore 0x00007fff485713a1 -[UIViewController view] + 27

12 UIKitCore 0x00007fff48c51ae1 -[UIWindow addRootViewControllerViewIfPossible] + 326

13 UIKitCore 0x00007fff48c5110a -[UIWindow _updateLayerOrderingAndSetLayerHidden:actionBlock:] + 219

14 UIKitCore 0x00007fff48c52195 -[UIWindow _setHidden:forced:] + 362

15 UIKitCore 0x00007fff48c655bc -[UIWindow _mainQueue_makeKeyAndVisible] + 42

16 UIKitCore 0x00007fff48e84d2c -[UIWindowScene _makeKeyAndVisibleIfNeeded] + 202

17 UIKitCore 0x00007fff48177720 +[UIScene _sceneForFBSScene:create:withSession:connectionOptions:] + 1405

18 UIKitCore 0x00007fff48c15561 -[UIApplication _connectUISceneFromFBSScene:transitionContext:] + 1019

19 UIKitCore 0x00007fff48c15898 -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 291

20 UIKitCore 0x00007fff4876a160 -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 361

21 FrontBoardServices 0x00007fff36c6091e -[FBSSceneImpl _callOutQueue_agent_didCreateWithTransitionContext:completion:] + 419

22 FrontBoardServices 0x00007fff36c869b1 __86-[FBSWorkspaceScenesClient sceneID:createWithParameters:transitionContext:completion:]_block_invoke.154 + 102

23 FrontBoardServices 0x00007fff36c6b347 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 220

24 FrontBoardServices 0x00007fff36c86642 __86-[FBSWorkspaceScenesClient sceneID:createWithParameters:transitionContext:completion:]_block_invoke + 355

25 libdispatch.dylib 0x00000001075eee8e _dispatch_client_callout + 8

26 libdispatch.dylib 0x00000001075f1da2 _dispatch_block_invoke_direct + 300

27 FrontBoardServices 0x00007fff36cac2d9 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 30

28 FrontBoardServices 0x00007fff36cabfc7 -[FBSSerialQueue _queue_performNextIfPossible] + 441

29 FrontBoardServices 0x00007fff36cac4d6 -[FBSSerialQueue _performNextFromRunLoopSource] + 22

30 CoreFoundation 0x00007fff23da1c71 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17

31 CoreFoundation 0x00007fff23da1b9c __CFRunLoopDoSource0 + 76

32 CoreFoundation 0x00007fff23da13cc __CFRunLoopDoSources0 + 268

33 CoreFoundation 0x00007fff23d9bf6e __CFRunLoopRun + 974

34 CoreFoundation 0x00007fff23d9b884 CFRunLoopRunSpecific + 404

35 GraphicsServices 0x00007fff38b5ac1a GSEventRunModal + 139

36 UIKitCore 0x00007fff48c19220 UIApplicationMain + 1605

37 FoodTracker 0x000000010737880b main + 75

38 libdyld.dylib 0x00007fff519b910d start + 1

39 ??? 0x0000000000000001 0x0 + 1

)

libc++abi.dylib: terminating with uncaught exception of type NSException

Thanks for your help in advance.

Xcode

263

Posted by

deepg

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Answer 1

Food Tracker has always been a broken toy, with built-in mistakes. This has been gone over several times in the past several years, so your best self-help is to simply start searching on: food tracker

As an example, I believe the solution you need at this time was previously covered in this 5 yr. old thread, so no need to repeat the correct code here, again:

Food Tracker - Tutorial problem

My advice, otherwise, is to run, not walk, away from the FT tutorial, drop it like a hot rock, and find something that won't force you to waste time attempting to fix outdated crap when you should be learning with comfort, instead.

...good luck.

Posted by

KMT

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Answer 2

As KMT pointed out, FoodTracker is badly bugged.

You'll get a lot more errors.

This one is easy to solve:

change:

class ViewController: UIViewController {

into

class ViewController: UIViewController, UITextFieldDelegate {

Now, self is a UITextFieldDelegate and you can set the delegate of the textField to it.

That simple.

Posted by

Claude31

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Food Tracker Tutorial Error

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