Xcode 6 Bug Unknown class in Interface Builder file

Question

I upgraded to Xcode 6 beta 4 and now my App continuously crashes with the message     Unknown class X in Interface Builder file    It crashes because supposedly Xcode can t find my custom classes that I have linked in my Storyboard but it shows that they are linked correctly in the Xcode interface   I m positive everything is linked correctly  My only other option may be to delete the entire storyboard file and start from scratch because it might be corrupted somehow   Edit  I would also like to add that I tried cleaning  reseting simulator  messing with build phases etc  None of that works

User · Answer

I had the same problem with Xcode Version 6 1  6A1052d   I think the problem appears if you renamed your App   Xcode Project   My solution was to add the module name in the interface builder manually

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My issue was related to a podfile framework  specifically the  BWWalkthrough    None of the above solutions worked for me  and no matter how I tried I couldnt get the module to point to my app   What ended up working for me was removing the library as a podfile and add it directly to my project as a static library  Everything was hunky-dory for me after that  Not entirely sure what was  broken  with the pod implementation of the class

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The solution was different for me  You need to add the  m of the class to the build phase compiled sources of the target    Hope this helps

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I fixed it by doing exactly the opposite of what ChikabuZ suggested  thanks for pointing it out  though   In the storyboard file  find this    lt viewController storyboardIdentifier  StoryboardId  id  SomeID  customClass  CustomClass  customModule  AppName  customModuleProvider  target  sceneMemberID  viewController  gt    and replace it with this    lt viewController storyboardIdentifier  StoryboardId  id  SomeID  customClass  CustomClass  sceneMemberID  viewController  gt    I can t believe how many hours I m losing getting around bugs in the Swift compiler and Xcode 6

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Check if your class has right Target Membership

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In my case  I added a flag -ObjC to Other Linker Flags in project settings to make it work  Also I tried with -all load flag and it worked well too

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I had the same problem with Xcode 6 3 when  I add files to  myapp   That s because I choose  create folder reference  instead of  create groups  I delete these files and add them again with the  create groups  option And the problem fixed

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Sometimes Xcode missed customModule  AppName  customModuleProvider  target    To fix it  open storyboard as source code and replace this line    lt viewController storyboardIdentifier  StoryboardId  id  SomeID  customClass  CustomClass  sceneMemberID  viewController  gt    to this    lt viewController storyboardIdentifier  StoryboardId  id  SomeID  customClass  CustomClass   customModule  AppName  customModuleProvider  target  sceneMemberID  viewController  gt

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I faced such a problem on Xcode 6 when I deleted the already included ViewController h  amp  ViewController m files from my new view based project  and deleted the scene that was related to this class from storyboard  Xcode cashes these files in derived data folder  so if you try to go to Window -  Projects -  your project and delete the derived data everything will go fine

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On me it happend because my project was called with

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In my case the problem was due to having our main storyboard set as the Launch Screen  and I d get a console error  no crash  at app start for every custom view controller referenced in the storyboard   We d covered from XIBs and launch images to storyboards and I hadn t yet gotten around to getting the launch screen working again  When I finally got around to creating a bare bones launch storyboard with no custom view controllers  which aren t allowed  these console errors stopped appearing

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I faced a problem when I created a project with the same name that already existed in my projects directory  though it was deleted some time ago   I wrote my solution there https   stackoverflow com a 27763697 1654692

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What  gfrs said is correct  you need to set the Module  However I once ran into an issue that my class wasn t listed in the Class dropdown  Eventually I removed the swift file  re-started Xcode and re-created the file  Finally the class was listed and could be used in Storyboard   Also have a look at this answer  which looks like to solve the  real  problem I encountered

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This really wierd when XCode 10 stopped to  refine debugs   In my case  i setted UITableViewDelegate and UITableViewDataSource with Storyboard and forget to implemente those required methods I just wanted to test the view first  before implement those methods  then crash  XCode 9  will warning about those methods  but XCode 10  really maked my code slow  not on this one  others i been thru this  error doubt  Hope this help someone  Thanks

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I had the same problem  but not the same fix   The project folder was kinda corrupted so i had to copy my project folder to another folder  for example your desktop and after that open the project   When it opened go to your interface builder project and you will see he recognise your script  Then you click indeed on the name of your script and press enter  u will see the module input will fill it self   And it will work like a charm   D

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I faced the problem when I ported the storyboard from Swift project to Objective-c project  noticing vvkuznetsov s answer  it turned out the two project using same identifier  I  Product -  Clean  and tap Enter key on the Module and Class text field  the issue went away

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These steps work for me    1  Clear Derived Data  2  Remove  h and  m files  3  Create  h and  m files Again

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Enabling Inherit Module From Target took the correct target module  That solved the issue

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in my case   i setup app as universal app  so xcode creates two storyboards but i was only using designed  only iPhone storyboard  and trying to run app in iPad for resolve problem just need to make app as only for iPhone and works great

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This can happen in any Xcode above 6 0  It happened to me after renaming some ViewController classes in Swift project  but I guess it will happen with Obj-C too   You just have to open the interface builder  go to Identity Inspector of ViewController that had its class renamed  select class and press Enter  That will reassign renamed class to selected ViewController and also reset Module Value which gets lost after renaming the class   Update for Xcode 8 1  probably 8 0 too    Xcode 8 1 just crashes  Simply and annoyingly just crashes and doesn t print anything  I was chasing that phantom crash for an hour just to find out that it was this very same thing - unassigned class in IB  If you re getting some phantom crashes  double check IB for unassigned classes first

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My solution  Xcode 8 1 Swift 3 0    Unknown class xxx in Interface Builder file   Open StoryBoard as Source Code and search for xxx  Remove attribute which contains value xxx  Build and Run

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You need to check the box  Inherit Module From Target  Checkbox

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It happened to me because my class was marked with  objc and in sotryboard it couldn t find the module  Removing  objc fixed the problem

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I m a PyObjC user and I had my NSView subclass in its own file  What solved this problem for me was to move the NSView subclass from its own file into my AppController py file  This is the file that has the application controller in it

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I solved this by opening my storyboard file as source code and using command-F to search for my unknown class and delete the custom class associated with it

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I googled everywhere for this  None of the answers work for me until i met 1 dude who asked me to move my project folder to desktop  It just worked automatically  Apparently if you have you project folder to deep in many folders  XCODE actually breaks

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I resolved this issue as I was typing the question  I figured I d answer my question and leave it here for anyone else who may face this issue when using Xcode 6 beta 4   To resolve this issue  you need to select each of your custom class objects in Storyboard  this includes any custom views  even the custom view controllers themselves    Then with those objects selected  open the identity inspector and under  Custom Class  you should see the Module option  Click inside the Module text box  and press enter   That s it  The current module for all of my custom objects must have been internally incorrectly set somehow in Xcode 6 beta 4  But there was no visual indication of this in the inspector   Note that if pressing enter inside the Module text box doesn t work  try selecting the arrow to the right and manually select your current module  then clear the text box and press enter  You can also try pressing enter inside the class text box  although this usually is to resolve a different issue    Here is an image to make things more clear

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I faced this problem in Xcode 8  to resolve it I had to modify storyboard in the text editor   In general  look up for your control and remove customModule and customModuleProvider from control entity   Did a trick for me

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I faced this issue in Xcode 6 1 when I removed Main storyboard   the LaunchScreen xib file and the default ViewController classes from my project   I fixed it by deleting the Launch Screen File and Main Interface entries from Info plist

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For me i ve tried all the solutions in this question didn t work   i finally made it by   copy the pod  h  m files into my project and imported the  h into my project c header  then i went back to storyboard the class was UICountingLabel i removed it and hit enter   empty no class     then i added it again and hit enter  worked successfully

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Swift 3 solution   All these did NOT work    Clicking on Module on right pane did NOT work  Adding  obj did NOT work  Restarting did NOT work  Moving to desktop as xcode breaks for longer path is NOT working        This worked finally   Just create new directory and create a new project inside that  Add the files except Main sotryboard   Now copy the view controllers from previous project and paste it into new Main storyboard   Voila   This works

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For me  I m using Xcode7   Swift2  Solved this problem by checking my code  I have this line in my viewController    self  navigationController  pushViewController vc  animated  true    Then I realized that I haven t get navigationController connected to the detail page  So if you re pushing a new ViewController with customized ID  better to check that

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In mij case the ViewController h m where in a lib  The projects still builds but since Xcode 6 3 the above error was shown at run-time  Moving both files back into the project solved the issue

User · Answer

I had the same problem   In my case  Xcode wasn t adding my custom class to  Target   Build Phase   Compile Sources   So I recommend you to verify if your CustomClass m is there     I hope this helps you

User · Answer

Select your unknown class file  open file inspector tab  check your target name in Target Membership  There you go

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I had this problem after I added a new target  then created a new class using the  New File  dialog but accidentally failed to check the new target as well as the original target in the creation dialog  so the object was only added to my original target  The solution was to delete the source files  remove reference only  then add them back using  Add Files   this time checking both targets

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This worked for me when nothing else did  From the project directory in terminal      Developer MyProject  grep -rn ViewController     grep -i xib    Open the matched files as source code in Xcode and change any instances of ViewController to what you actually need  In my case the file I needed to open as source was Main storyboard and I changed instances of ViewController to DetailViewController   I deleted two files from Xcode and main storyboard which is what I believe caused this issue for me to begin with

User · Answer

I solved this problem by typing in the Module name  unfortunately the drop list will show nothing     in the Custom Class of the identity inspector for all the View controller and views   You may also need to indicate the target provider  To achieve this objective you can open the storyboard in sourcecode mode and add the  customModuleProvider  attribute in both ViewController and View angle brackets

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Project with Multiple Targets  In my case I am  working on Project with multiple Targets and the issue was  inherit from Target  was unchecked  Selecting  inherit from target  solved my problem

User · Answer

This worked for me    Check your compiled source  whether that file e g  ViewController m  is added or not  in my case ViewController file was not added so it was giving me the error

User · Answer

Selecting the proper Module for my Custom Class I solved this problem     Here it is

User · Answer

My issue was user error   I had a generic UIView in my storyboard and in the Custom Class section of the Identity Inspector I had accidentally changed the name from UIView to gibberish   All it took to fix was to change it back to UIView

User · Answer

In my case  the class referenced in the Storyboard   xib did not have Target Membership set   To fix  give that class s  h and  m files the same Target Membership as your other classes

User · Answer

What only worked for me is actually adding the module name to the xib file      Sooo  the xib files look like this   mymodule MyViewController xib  Module being the name of the proyect  usually    HORRIBLE solution in my opinion  but that is supposedly how Apple wants us to do it now    This question shows 3 possible work arounds back in beta 4     apparently Apple has not been very helpful in this situation according to some because they call it  Working as intended

User · Answer

Don t use spaces in the project name  otherwise the Custom Class will not find your own classes

User · Answer

Sometimes the controller you are providing loses its target membership from the current application  In that case  pressing enter on the  Module  field will do nothing  Go to the controller and make sure that it has target membership set to the current app

User · Answer

For me the problem was that I was referencing a custom class in the storyboard  which matched to a  h file  but I didn t have an  implementation command in the  m file

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I was playing with Spring class  And this error happend to me because i used folder as reference when moving whole folder class to project instead of creating groups  So this was my solution  dont use folder as reference but create groups

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My answer  set custom Module equal to the custom Pod name  in my example - custom class name  like on the screenshot attached  This solution is for a specific case  for custom views classes from Pod  or Carthage  framework    Infrastructure  XCode8  Swift3

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I had this problem after renaming a swift class  Solved it by using the  objc directive    objc ForumTopicListViewController  class ForumTopicListViewController

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I fixed this along the lines of what Laura suggested but I didn t need to recreate the files   Using XCode 4  in the Project Navigator  select the  m file that contains the class that it is complaining about  Go to View- Utilities- Show File Inspector  this will show the File Inspector to the right  with that  m-file info   Open the Target Membership section and make sure that your target is selected for this  m-file  When I added my  m file to my project  it didn t add it to my default target for some reason and that caused me to get the error you mentioned

User · Answer

My solution was to remove  objc from Custom class definition

[ios] Xcode 6 Bug: Unknown class in Interface Builder file

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