Use of undeclared type in Swift even though type is internal and exists in same module

Question

I have a type in my module   import Cocoa  class ColoredDotView   NSView              It is used in a number of different classes with no issue   class EditSubjectPopoverController   NSObject         IBOutlet internal var subjectColorDotView   ColoredDotView              But for some reason  when I use it in one specific class  I have compilation errors on the type   class EditTaskPopoverController   NSObject         IBOutlet internal var lowPriorityDotView   ColoredDotView     Error here      IBOutlet internal var medPriorityDotView   ColoredDotView     And here         IBOutlet internal var highPriorityDotView   ColoredDotView     And here                The compilation error is      EditTaskPopoverController swift 15 49  Use of undeclared type    ColoredDotView    Which I don t understand  It s the first compilation error in the file  and the rest of the errors are all symptomatic of the first  Further  there are no other files with compilation errors  I don t understand why the type is undeclared  as the file is in the same module     I have tried cleaning the project  cleaning the build folder  and restarting Xcode  to no avail  What potential missteps can cause an undeclared type compiler error in Swift

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There are seemingly multiple reasons for this issue  Following the accepted answer did not solve it  For me it was Product   Clean Build Folder

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When testing Swift code that belongs to the application  first make sure the test target is building the application as a dependency  Then  in your test  import the application as a module  For example    testable import MyApplication  This will make the Swift objects that are part of the application available to the test

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Not adding the correct import delcaration can also be an obvious miss  For me  I had simply omitted to import PriorityUIKit

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This can also happen if you have a function with the same name as an object type in your signature  For example   class func Player playerObj  Player    will cause the compiler to get confused  and rightfully so  since the compiler will first look locally within the file before looking at other files  So it looks at  Player  in the signature and thinks  that s not an object in this scope  but a function  so something is wrong   Perhaps this is a good reason why I shouldn t capitalize class functions

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In case someone makes the same silly mistake I did     I was getting this error because in renaming my source file  I accidentally removed the  from the filename and so the compiler treated the file as a plain text file and not as source to compile   so I meant to rename the file to MyProtocol swift but accidently named it MyProtocolswift  It s a simple mistake  but it was not readily obvious that this is what was going on

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In my case  the issue was with a new class not being recognized  I solved the issue by deleting the class and re-adding it but this time checking the Watch App Extension option when creating the new class     Please note that I do have a Watch App Extension in my Application

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In my case was a mistake made by me  I added a new file as  OS X Source Cocoa Class   instead of  iOS Source Cocoa Touch Class

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For me  I encountered this error when my test target did not have some swift files that my app build target had in compile sources    It was very confusing because the  undeclared type  was being used in so many other places with no problem  and the error seemed vague   So solution there was of course to add the file containing the  undeclared type  to the test target

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The cause for me was a function name that began with same characters as a type    IBOutlet weak var tableView  CustomTableView    and in the implementation I had a function beginning with CustomTableView  func CustomTableView tableView  CustomTableView  dataForRow row   Int  - gt  NSData         The fix was to change the function signature so that it didn t begin with the same characters as the type  CustomTableView   e g    func dataForRow row  Int  tableView  CustomTableView  - gt  NSData         This was a very misleading error message for the actual cause in my case

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I tried many of the solutions offered here  but eventually deleted the file and created it again  and Xcode was mollified

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Maybe you have added class with some  FirstNameClass  and after that manually rename to  ColoredDotView   Try to copy content of  ColoredDotView  class to clipboard  remove   ColoredDotView  from project and add agin   This id fix similar problem from me

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My situation is that I drag a new file XXView swift into the project  And declare a View type to be XXView then the error  use of undeclared type        I just try to add my XXView swift to the test target which it solved the error  But I didn t want my UI Class involved in the test target   Finally  I found my ViewController already in the test target which should not happen    I think because I create the VC by an xctemplate therefore  it automatically be included in the test target   I remove the view controller from the test target  and then my XXView is now no need to add to the test target   Conclusion  make sure all your related files should also uncheck the test target

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In XCode menu Product- Clean and then Product- Build worked for me  I encountered this issue when added new ViewController to my project in new Group Folder

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Had an error with type Int  due to referencing to a local case in my enum called  Int   func foo        switch self         case  Int var info                     some other code          There error was here  someFuncWithInt parameter  Int    Fixed it with  someFuncWithInt parameter  Swift Int

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Like others  it was some unrelated code that was causing the  testable to malfunction   In my test target there was an Objective-C header file that had    import ModuleUnderTest   I removed this line  because the import was actually unnecessary  and miraculously  testable starting working again   I was only able to track this down but removing everything from my project and adding it back in bit by bit until it failed   Eventually I found the problem line of code

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if you are accessing it from different module or Target then you just need it to public it

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as others mentioned well and in this thread  use of unneeded swift files in  copy bundle resources

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I got this error message in Xcode 8 while refactoring code in to a framework  it comes out that I forgot to declare the class in the framework as public

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In my case  the TestTarget s compile sources were having files from the Main Target   Ref     Why this happens     This happens since we check the TestTarget association while creating the file Or manually checking this option from the inspector   Ref      How did i resolve     I removed the main target s files from compile source of Test Target

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After spending an hour on this error I found that the module file is duplicated  delete the extra file  and shift cmd k to clean and the error is gone

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Sometimes errors can be very silly       Before checking all the solutions up here   make sure you have   imported all the basic stuff        import Foundation      import UIKit      It is quite a possibility that when you import some files from outside   to your project  which may miss this basic things as I experienced   once

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In my app I have app delegate and other classes that need to be accessed by the tests as public  As outlined here  I then import my my app into my tests   When I recently created two new classes  their test targets were both the main and testing parts  Removing them from their membership from the tests solved the issue

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I had the exact same problem  Some of the files in my framework were not reachable from other classes within the same module   For some reason the files that had been added to the framework in Xcode was not part of the Compile Sources  If your Swift file is not part of the compile sources you need to add them by tapping the   and selecting them in the popup     Also make sure the file is part of the framework target   The little box in the screenshot below should be checked

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This might help someone   I ve created new test project with Core Data called  CoreData   Shortly I ve got  Use of undeclared type  for NSManagedObjectContext and other Core Data classes  After several attempts of importing  adding to Build phases  etc  I ve deleted project and started new one called  TestingCoreData  and it all worked well   Don t name  test  Projects like name of the Classes

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The issue for me was the type I was using was in objective-c in a swift project and I had forgotten to import the type s objective-c header file in the bridging header file

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In my case I wanted to add a method with a custom swift object as a type parameter  and the name I gave to the variable in the parameter was exactly the same as the custom object class name  The problems was something like this   func moveBlob   blob     blob          code     The part in bold characters was causing the error of undeclared type

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In case anyone encounters a similar problem but the Compile Sources fix does not solve the problem  restarting Xcode may  it worked for me   My version of Xcode is Version 6 1  6A1052d

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This can also happen if you by accident capitalize the parameter name  and call it the same as the object   class func didRecieveData BlockItems   BlockItems

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In my case  this was caused by a subclass name being used in the very next line as a variable name with a different type   var binGlow  pipGlow   pipGlow style   Bin   var pipGlow  PipGlowSprite   PipGlowSprite     Notice that in line 1  pipGlow is the name of the subclass  of SKShapeNode   but in line two  I was using pipGlow as a variable name   This was not only bad coding style  but apparently an outright no-no as well   Once I change the second line to   var binGlow  pipGlow   pipGlow style   Bin   var pipGlowSprite  PipGlowSprite   PipGlowSprite     I no longer received the error   I hope this helps someone

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Phew  finally diagnosed this  Somehow  the offending Swift file EditTaskPopoverController swift was in two different build phases   It was in Compile Sources properly  with all the other Swift files  but it was also  for some very strange reason  in the Copy Bundle Resources phase as well  along with all my XIB and image resources   I have no idea how it got there  but removing it from the extra build phase resolved the issue

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In my case  that was caused by swift files s Text Encoding  One file showed  No Explicit Encoding   and after convert that to  UTF-8   problem solved   And the reason why file s text encoding is not explicit is that I copied all code from other swift file   No Explicit Encoding Screenshot    UTF-8 Screenshot

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This has already been answered by  Craig Otis  but the issue is caused when the classes in question do not belong to the same targets  usually the test target is missing  Just make sure the following check boxes are ticked    Edit To see the target membership  Select your file then open the file inspector          1   option     command    1

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Cleaning the project solved my problem   Steps  Product -  Clean or Shift   Cmd   K

[xcode] "Use of undeclared type" in Swift, even though type is internal, and exists in same module

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