'Use of Unresolved Identifier' in Swift

Question

So I have been making an app, and everything has been working great. But today I made a new class like usual and for some reason in this class I can't access Public/Global variable from other classes. All the other classes can, but now when ever I try to make a new class I can't. How would this be fixed?

I am using Swift and Xcode 6.

Working Class:

import UIKit
import Foundation
import Parse
import CoreData

var signedIn = true

class ViewController: UIViewController {

New Class:

import UIKit

class NewClass: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        signedIn = false

}

But on signedIn = false

I get the error:

use of unresolved identifier "signedIn"

and yes I have deleted and recreated this class several times — Apple Geek, Mar 11 '15 at 20:33
Can you specify the version of XCode / Swift you're using (if it's beta or not) ? — lchamp, Mar 11 '15 at 20:48
Is this your complete code? because of your indentation it looks like you are missing a curly bracket `}` at the end of your `viewDidLoad()` — Wez, Mar 11 '15 at 20:54

score 298 · Accepted Answer · edited Aug 22 '17 at 13:05

298

One possible issue is that your new class has a different Target or different Targets from the other one.

For example, it might have a testing target while the other one doesn't. For this specific case, you have to include all of your classes in the testing target or none of them.

Targets

edited Aug 22 '17 at 13:05

thomaux

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answered Mar 11 '15 at 20:58

lchamp

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If the class is in a different target, make sure you import it on top of your swift file – Medhi Oct 28 '16 at 09:12
2

hehe, that was a problem. I forgot to setup a target for class. Tnx :) – tBug May 31 '19 at 10:56
Oh man, I spent a couple of hours to solve this one. Such a stupid error message. Even Syntax Error is better! – turingtested Sep 05 '19 at 16:17
yup.. it wasn't set in a target for a test project!! thank you – reidisaki Oct 18 '19 at 21:38
1

Mine was in, but I just unchecked then re-checked, which fixed this AND my autocomplete/intellisense came back! – Stephen J Jan 23 '20 at 19:31

ThomasW · Answer 2 · 2020-08-02T22:41:29.793

12

Once I had this problem after renaming a file. I renamed the file from within Xcode, but afterwards Xcode couldn't find the function in the file. Even a clean rebuild didn't fix the problem, but closing and then re-opening the project got the build to work.

edited Aug 02 '20 at 22:41

answered Jun 17 '20 at 10:10

ThomasW

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exactly right i removed the files references and then added them again. and everything worked – Hamed Nova Sep 06 '20 at 09:12

score 7 · Answer 3 · edited Aug 16 '18 at 04:30

7

'Use of Unresolved Identifier' in Swift my also happen when you forgot to import a library. For example I have the error:

In which I forgot the UIKit

import UIKit

edited Aug 16 '18 at 04:30

oOEric

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answered Apr 28 '18 at 09:21

Cons Bulaquena

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import AVFoundation – Jenita _Alice4Real Jun 20 '18 at 10:12

score 4 · Answer 4 · answered Oct 29 '15 at 18:57

Sometimes the compiler gets confused about the syntax in your class. This happens a lot if you paste in source from somewhere else.

Try reducing the "unresolved" source file down to the bare minimum, cleaning and building. Once it builds successfully add all the complexity back to your class.

This has made it go away for me when re-starting Xcode did not work.

score 4 · Answer 5 · answered Mar 29 '16 at 22:27

Another place I've seen this error is when your project has multiple targets AND multiple bridging headers. If it's a shared class, make sure you add the resource to all bridging headers.

A good tip to is to look in the left Issue Navigator panel; the root object will show the target that is issuing the complaint.

mfaani · Answer 6 · 2016-11-18T21:26:39.000

3

For me this error happened because I was trying to call a nested function. Only thing I had to do to have it fixed was to bring the function out to a scope where it was visible.

edited Nov 18 '16 at 21:26

answered Jun 25 '16 at 22:40

mfaani

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By "bring the function out to a scope where it was visible", do you mean mark it as public? – Barry Jones Oct 01 '19 at 20:56
No. Just purely moving/dragging the function to a different scope ie under the scope of the class – mfaani Oct 01 '19 at 20:59

score 3 · Answer 7 · answered Feb 26 '20 at 14:19

3

In my case, I had an Object-C file which was also in the same Target Membership. I fixed by adding #import "YourObjectCFileHeader.h" inside file Bridging-Header.h

answered Feb 26 '20 at 14:19

Ribaz

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score 1 · Answer 8 · answered Mar 11 '15 at 20:49

1

Because you haven't declared it. If you want to use a variable of another class you must use

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    var DestViewController : ViewController = segue.destinationViewController as ViewController
    DestViewController.signedIn = false
}

You have to put this code at the end of the NewClass code

answered Mar 11 '15 at 20:49

Ftagliacarne

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yes but I have used other classes and they have worked fine without that, it's just when I make this new class. – Apple Geek Mar 11 '15 at 20:50
2

This won't work, he has the signedIn variable declared in the global scope, not inside his class. – Sam Mar 11 '15 at 20:57

score 1 · Answer 9 · edited May 19 '16 at 22:00

1

Your NewClass inherits from UIViewController. You declared signedIn in ViewController. If you want NewClass to be able to identify that variable it will have to be declared in a class that your NewClass inherits from.

edited May 19 '16 at 22:00

Fabio says Reinstate Monica

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answered May 19 '16 at 20:47

M Johnson

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score 1 · Answer 10 · answered Dec 05 '17 at 06:02

I got this error for Mantle Framework in my Objective-Swift Project. What i tried is ,

Check if import is there in Bridging-Header.h file
Change the Target Membership for Framework in Mantle.h file as shown in below screenshot.

Toggle between Private Membership first build the project , end up with errors. Then build the project with Public Membership for all the frameworks appeared for Mantle.h file, you must get success.

It is just a bug of building with multiple framework in Objective-C Swift project.

score 0 · Answer 11 · answered Jun 29 '17 at 01:02

If this is regarding a class you created, be sure that the class is not nested.

F.e

A.swift

class A {

   class ARelated {

   }
}

calling var b = ARelated() will give 'Use of unresolved identifier: ARelated'.

You can either:

1) separate the classes if wanted on the same file:

A.swift

class A {

}

class ARelated {

}

2) Maintain your same structure and use the enclosing class to get to the subclass:

var b = A.ARelated

score 0 · Answer 12 · answered Nov 07 '17 at 18:18

0

I did a stupid mistake. I forgot to mention the class as public or open while updating code in cocoapod workspace.

Please do check whether accesor if working in separate workspace.

answered Nov 07 '17 at 18:18

abhimanyu jindal

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score 0 · Answer 13 · edited Oct 10 '18 at 16:12

0

You forgot to declare the variable. Just put var in front of signedIn = false

edited Oct 10 '18 at 16:12

shim

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answered Oct 10 '18 at 15:43

Davron Jabborov

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I would assume that that is just a typo in the posted code (along with the missing closing bracket on `viewDidLoad`. – shim Oct 10 '18 at 16:15

score 0 · Answer 14 · answered May 13 '20 at 21:08

0

My issue was calling my program with the same name as one of its cocoapods. It caused a conflict. Solution: Create a program different name.

answered May 13 '20 at 21:08

Hola Soy Edu Feliz Navidad

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score 0 · Answer 15 · answered Jul 20 '20 at 09:39

This is not directly to your code sample, but in general about the error. I'm writing it here, because Google directs this error to this question, so it may be useful for the other devs.

Another use case when you can receive such error is when you're adding a selector to method in another class, eg:

private class MockTextFieldTarget {
private(set) var didCallDoneAction = false
    @objc func doneActionHandler() {
        didCallDoneAction = true
    }
}

And then in another class:

final class UITextFieldTests: XCTestCase {
    func testDummyCode() {
        let mockTarget = MockTextFieldTarget()
        UIBarButtonItem(barButtonSystemItem: .cancel, target: mockTarget, action: MockTextFieldTarget.doneActionHandler)
        // ... do something ...
    }
}

If in the last line you'd simply call #selector(cancelActionHandler) instead of #selector(MockTextFieldTarget.cancelActionHandler), you'd get

use of unresolved identifier

error.

'Use of Unresolved Identifier' in Swift

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