Cannot find in scope swift ошибка

I am facing a strange error when writing the simplest of swift programs in Xcode 12.0.1.
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It says that it can’t find T1 in scope when it is very much in scope. I feel that it must be trivial to solve this problem, and I tried ⌘ + ⇧ + K and closed Xcode and reopened, but the problem persists. Anyone knows how this can be solved?

asked Dec 11, 2020 at 3:03

Sometimes there are ghost errors that seem to not go away, even when Xcode is closed and reopened, but are fixed by either changing the code then changing it back, or clicking build anyway and the build succeeds.

Otherwise, the color highlighting of T1 in the return doesn’t match in the variable declaration. That suggests name clashing. Are there any types or global variables called T1, even if there’s nothing else in your code maybe it’s a built-in type or similar? Try naming the variable differently.

answered Dec 11, 2020 at 3:09

I got the same error and was searching around, but couldn’t find an answer to it so I’ll share it here for others to find as well. For my part, I was creating a view in a package and was referencing that view from an app.

I got the Cannot find [Type] in scope and turns out I forgot to put the public attribute on the view struct.

answered Aug 23, 2022 at 7:06

Kent RobinKent Robin

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I had many swift compiler errors of this type : «Cannot find type ‘className’ in scope» after passing from Xcode 12.5 to Xcode 13. And the error is always referred to Objective-C classes.
The project is for an iOS 11 app for iPad.

The bridging-header is correctly set and the project with the same build-settings has never given this error before Xcode 13.

I’ll try to clean the derived data folder without success.
the strange thing is project compile successfully and I can run on simulator as well but after few second from a successful compilation on any swift files that use objective-c class is fired
the swift compiler error.

Any idea? thanks

Accepted Reply

I finally solved the problem removing all #import in bridging header of files contained in my pods libraries

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I add sample code and screen of the error, i hope is useful, PersonalEditorContentPageVC and QWidget are Objective-c classes.

class ContactViewController:PersonalEditorContentPageVC {
    var activeWidget:QWidget?
    var prevActiveWidget:QWidget?

Screenshot 2021-10-08 at 22.11.41.jpg

Go to build settings and build after setting Precompile Bridging Header YES -> NO.
You can show no errors.
But codes defined by objec aren’t recognized. It is not able to jump to definition.

I finally solved the problem removing all #import in bridging header of files contained in my pods libraries

I finally solved the problem with Product -> Clean Build Folder

I am seeing complier error on WKMediaCaptureType and WKPermissionDecision. I made sure WebKit is imported in WebViewDelegationHandler.swift file. Cannot find type ‘WKMediaCaptureType’ in scope. Cannot find type ‘WKPermissionDecision’ in scope. Any clue why it is happening. Thanks in advance!

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When those simple annoyances are too frustrating! Yes we have all been there and I was really hoping that Apple would have fixed what is obviously a bug.

Historically I have found Core Data annoying to work with… so for a while now I have been managing the database using Realm. However, with Realm now significantly bloating (553MB) and the Realm Browser app on OSX no longer usable, it was time to visit my old friend. With open arms it tripped me up straight away. I had deleted the cursory Item entity and added a new entity named Person. With that change I was greeted with Cannot find ‘Person’ in scope. As I had deleted Item, even if I added that back in to the code — correctly the error was Cannot find ‘Item’ in scope. At least I had something working. Or was it really working for me…

I needed to give Xcode a good clean.

The clearing process I did to get it running again was:

Clean build folder (shift + command + k)
Close Xcode completely
Delete 'DerivedData' content (/Library/Developer/Xcode/DerivedData)
Open Xcode and your project again
Try to build and run it again

Deleting derived data

Run the following command to delete the contents of your DerivedData directory, replacing {your-name}:

rm -rf /Users/{your-name}/Library/Developer/Xcode/DerivedData/*

Andrew Fletcher
•
18 Jun 2022

Andrew Fletcher
•
04 May 2022

Andrew Fletcher
•
27 Apr 2022

ionic app in Xcode white screen cannot find files issue

While loading an ionic project, in Xcode when performing a run routine I had the following response

⚡️ Loading app at capacitor://localhost…
2022-04-17 15:54:01.318573+1000 App[74515:7355495] [Process] 0x7f8758828820 — [pageProxyID=5, webPageID=6, PID=74520]…

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Comments

groue

changed the title
Xcode 12 beta error: «Cannot find ‘CodingKeys’ in scope»

Xcode 12 error: «Cannot find ‘CodingKeys’ in scope»

Sep 20, 2020

tobyspark