I know that there are a lot of questions on this subject but I've tried most of them to try and figure it out with no success.
the problem:
at first I couldn't add my class from the assistant editor cause the custom class didn't pick it up.
I made sure the calls inherits from uiviewcontroller
I made sure the class is added to the target
I tried to remove the class file and re-add it back
finally I've added the class through the storyboard xml and it appeared in the custom class
Now I'm trying to connect my buttons, views etc to its outlets. It seems like they are connected but when running the app and opening that view controller the app crashes and the debugger prints:
"Unknown class xxx in Interface Builder file."
and than
"this class is not key value coding-compliant for the key btnMenu."
I've checked:
That connection inspector is properly set (no error in the outlets there)
Tried to delete derived data
Clean project
Re-install the app
I even tried restarting my mac and of course no success.
can anyone shad some light here?
thanks.
I just had this happen with a UIViewController subclass (with Xcode 9 beta 2 & Swift 4) and the solution was to tick 'Inherit from Target' where I set the Custom Class in IB.
If your view happens to be in a .bundle file (such as for a framework/static library) that gets copied to a different target, you'll want to set an explicit module target for each xib/storyboard class rather than having it inherit from the target that's hosting it.
For me the problem was that the class was not part of the Target Membership. Just add the class to the target, and you should see it back on the interface builder. This Helped in my case.
After I checked the tick mark called "Inherit Module From Target" in Custom Class in View Controller Section, it works fine. Can Follow the image.
To find this >
Select your view controller yellow button > then click "Show Identity Inspector" > then checked the tick mark called "Inherit Module From Target"
What #Anthony Scott mentioned is true until you have Framework_A dependent on Framework_B and class is from Framework_B :) Then you need to deselect checkbox and provide Module which contains given class. Thanks for the question btw. I am using Commons framework for other frameworks and it helped me to realize this ;)
For those who develop custom Cocoa Touch Frameworks this can be helpful.
If you are trying to assign a class to a ViewController, please make sure the class you created is inheriting a UIViewController. The only reason that xCode won't recognize your class is where it is a different type of instance, let's say, may be a UITableViewController type.
Please check the inheritence of your class first.
I had this problem with a custom UIView I was testing, where the UIView was in a framework. I had created a simple app, created a UIView in the Storyboard's default ViewController and set its class to MyCustomView. I always got the "Unknown class in interface builder" error when the app launched. I was importing my framework, and I checked in the built product that the framework was there.
The problem was that my test app code never actually used the framework. Even though the Storyboard referenced it, I guess it never got loaded. When I added a [MyCustomView load]; into the test app code, it all worked.
For those who encounter this problem but with a system class like PKCanvasView or ARView, in a storyboard.
After you've set view's Custom Class to any of those system classes, make sure the Module is set to None. Next go to target's Link Binary with Libraries in Build Phases and manually link the framework which contains that class. One last step is to do a clean and remove derived data (it's critical otherwise the problem won't float away).
ok so i dont know how and why, but, i did (AGAIN) what i already tried before which is:
deleting the class
creating the same class with new name
removed the scene and recreated it in the storyboard
connected it all (in the same usual way!!!)
now it seems that Xcode knows my class....
i still don't know what was the problem but i guess it has something to do with the linker.
I ran into this error because I accidentally saved my class file to the Base.lproj folder when I created it.
I fixed the error by right-clicking the file in the Project Navigator and deleting the reference to it. I then moved the file through Finder to the correct folder. Then I right-clicked the main group in the Project Navigator and clicked Add Files to "GroupName"... and selected the class and clicked the Add button.
After that the error went away.
Check the name of your class. Make sure that it corresponds to the class to which you have assigned your ViewController in the property inspector.
You need to instantiate the view controller with the custom class. Without that you might have the error.
self.storyboard!.instantiateViewController(withIdentifier: "namePage") as! EmailAndPassword
none of this helped. My problem was I created custom storyboards and added custom classes. But I forgot to take of the initial view controller arrow from auto-generated main storyboard and changed the initial storyboard to my custom storyboard which fixed it for me.
I found the problem for me was that the UIViewController that I was pointing to did not have a ViewController.swift file attached to its "Custom Class" parameter!
I created a class called HelloWorld and I would like to link it with a display.
I could code in the HelloWorld class in order to control the behaviour for a specific app page.
However, when I clicked on the identifier inspector, it doesn't show the HelloWorld class at all. I was wondering which process I did it incorrectly?
Here is an example:
While creating a class always remember to choose correct class for your subclass. like if you are trying to add class in UITableViewController type view than your subclass must be of UITableViewController
I guess the problem is you are trying to change you ViewController's view's class, not your controller's class.
To do that,
Step 1: click on your view controller/Click on Hello World shown in your above image.
Step 2: Then try to change class name in interface builder.
That's it.
I have an objective-c project. I want to create a single swift file in the project and use it to initialize and present a view controller which has been assigned the swift file. Note that i do not want to import a whole swift project. Just a single swift file.
I have added #import "MySwift-Swift.h" and anything else i could find in the web but non of them works.
To create the file, right click on your project name and click 'New File'. Then make sure you're in the iOS section, at which point scroll through the categories (I believe you can find it in 'Source') and click 'Swift File'.
Name it whatever you would like and make sure that it's a subclass of UIViewController. Then in your storyboard, in the inspector, change the class to what you named your file.
Hope this helps,
Will
Let me preface this by saying that I've already tried quitting and restarting Xcode, as well as deleting derived data for the project, to no avail. I'm at wits end right now.
Basically, I've created a custom ViewController class I want to use, but I cannot select it. In fact, using the Custom Class dropdown, I can only select the default UITableViewController class for my controller. The weird part is, it looks like the full list appears for a split second sometimes, before being replaced by the incorrect list with a single option. Here's what it looks like:
I would really appreciate any ideas here. I'm not really sure what I could have done wrong, since I was following this Apple tutorial pretty much to the T.
For another scene in my project, which is just a plain view controller, I can select custom classes with no problems.
Ideas?
You have to inherit from UITableViewController class so basically the interface file (.h) should looks like that:
#interface YOURCLASSNAME : UITableViewController
Make sure you replace YOURCLASSNAME with your class name and you add UITableViewController and that should do the job.
Make sure the swift file is defined as a UITableViewController and not as a UIViewController.
I have a UIViewController I created in my apps storyboard, as well as a custom UIViewController subclass which I added to the project (and is correctly in the compile phase for my target). However when I go to set the 'Custom Class' property on the view-controller in Storyboard my custom class does not show up on the list.
Checked that the class is part of my app's target, not tests'
Double checked that it is correctly a subclass of UIViewController
Compiled program just to make sure xcode was working with latest information
Restarted xcode
What would cause my class to not show up in the 'Custom Class' drop down?
Two ways I found that solve the problem but they are work arounds:-
Just type the view controllers name in the text field, or
close the project and then reopen it and in the project initialization it places the file on the list.
If you still have your problem or for those who could have the same problem:
Make sure to select on your storyboard your "ViewController" instead of your "View" (which is automatically selected when you click on the view in the storyboard). The difference between those two is that when the view controller is selected, a blue rectangle pop up around your app. To be sure to select the view controller, open the document outline and select it directly in your storyboard hierarchy.
I would try the following:
Check that the file implementing the class is part of the build phases (check under target > build phases)
Add the .m file to build phases (if it isn't already).
Restart Xcode.
You can fix this by editing the XML of your Storyboard.
Right-click your My.storyboard entry in the Project Navigator panel and select the Open As->SourceCode menu choice. Find your view controller entry in the XML, and add the attribute customClass="MyController".
Save the storyboard.
Right-click your My.storyboard entry in the Project Navigator panel again, and select the Open As->Interface Builder - Storyboard menu choice.
The custom class entry will now contain your MyController class name.
Make sure your class inherits from UIViewController.
#interface ClassName : UIViewController
In Xcode 8, a few of my classes had the wrong path (case sensitive) specified for their file locations.
MyProject/mysubdirectory/MyViewController.xib (.m, .h)
vs:
MyProject/MySubdirectory/MyViewController.xib (.m, .h)
Really not sure how it ended up in that state, but my project exhibited the exact same behavior as above (no outlets/actions displaying in IB), and fixing that path fixed the problem.
I fixed this two different ways. One way was by I opened the .pbxproj file and fixing the case sensitive issue manually. The other way that worked was by tapping the folder icon under the Identity and Type section of the File Inspector tab of the file, and re-selecting the file there.
Click on a different view controller in the storyboard, then click on it's custom class pulldown to confirm the new class is listed, but don't select it. Click back on the new view controller you made and you should see it now listed in its custom class pulldown menu. odd, eh? just forces a refresh I think.
I had been having the same issues as described in this problem. However, none of the suggested answers fixed it for me. My project compiled OK without warnings or errors, but, in the .h file there were no 'outlet' indicators to indicate that my outlets had been linked to storyboard elements.
Additionally, attempts to create new outlets in my code, by right-click and dragging into my header file, were not recognising my header source as a potential target for this operation. And furthermore, my Class did not make an appearance in the Custom-Class dropdown for the ViewController's property inspector panel.
And yet, the project compiled OK.
Closer examination showed that I had defined my own class in the following manner...
#interface KJBMainDataViewTrackConMk2<UIScrollViewDelegate> : UIViewController
which apparently compiles nicely.
But, if this is changed to the following, (moving the protocols to the end)...
#interface KJBMainDataViewTrackConMk2 : UIViewController<UIScrollViewDelegate>
Then everything springs to life. All outlets are suddenly indicated as being 'connected' with a storyboard element. And right-click dragging starts to work again, and my custom class appears in the custom-class drop-down in the property inspector panel for the storyboard ViewController!
Other answers here probably represent the most likely causes of this condition, but, I felt it worth mentioning at least this one other potential cause.
I had the same problem, but none of the other solutions worked for me. The issue for me was that I had a Mac and iOS target, both with their own versions of the same view controller. For example, I had a .h/.m pair of files named FooViewController for Mac and another .h/.m pair of files named FooViewController for iOS. Each pair was properly included with their respective targets, but for some reason Xcode does not like it and my view controller would not show up in the Custom Class dropdown in the view controller in the storyboard. I ended up renaming my class in the iOS view controller and it immediately showed up in the dropdown.
In my case, I drag a new TableViewController object to the storyboard, but I add a new file which's subclass is "UIViewController".... Then, I add a file which's subclass is "UITableViewController", problem solved!!
For those of you who are still having this problem after trying all the way around is probably because you clicked the View instead of ViewController.
You have to choose the file when ViewController is clicked.
This solved my problem.
I happened to come across this problem, and had no luck after trying the previous suggestions. Finally I found the reason is the header file's type is set to C++ header. After changing it to C header (like all the other header files), the class appears in the drop list. Don't know why though... Possibly helpful for others so I post it here.
Storyboard is looking for the custom class but physically its no there and its not displaying the custom class name in the list and also not displaying the outlets . Following solution perfectly worked for me.
Just copy your code some where else.(Lets say on desktop)
Open your existing code.
Delete the custom class file.(Move to trash)
Now add files from copied project folder (From desktop)
Don't forget to check "Copy if needed" check box
Open the story board and bingo you will get your custom class files in dropdown
be sure initially not adding the CustomViewController to any group or folder. place it in the root of your app.
none of the above(or below :) helped me. though I found that
after adding new viewcontroller to storyboard (just by dragging it in)
and adding my class by File\New\File\Objective-C Class, give it a name, no XIB, Next, Create
if I select my viewcontroller in storyboard and try to assign my class to it - my class is not there
BUT
if I click on a view that is in the viewcontroller itself then click on a class dropdown menu in Custom Class
AND THEN
select viewcontroller (click on a bar below the viewcontroller) and now again click on a class dropdown in Custom Class my newly added class magically shows up.
weird, must be a bug with refreshing. Xcode Version 5.1 (5B130a)
Make sure you select View Controller to which you want to attach your class. The easy way is open Document Outline and choose your view controller (When you tap on it form the Storyboard sometimes it simply doesn't choose the object you meant).
for my case, somehow bundle resources got deleted, so I added back and worked!
Build Phases -> Add Build Phase -> Copy Bundle Resources
find your file
Then drag and drop your file there
Then make sure your target membership is checked.
In my case, I selected the wrong UI.. so I deleted the class file and created a new one and selected the correct parent class
I had to restart XCode 7.3 (7D175)
What worked for me was, click on the file in the Project Navigator, then, in the File Inspector under "Identity and Type" beneath the "Location" dropdown box, click on the little folder icon and then select the file in the popup window.
Try to clean your project, and also restart your Mac. One peculiar thing that I did was change all the Custom Classes names and build the project again. It worked!
For macOS projects, creating a new class generated a class inheriting from NSObject instead on NSViewController.
Change from
import Cocoa
class AppsViewController: NSObject {
}
to
import Cocoa
class AppsViewController: NSViewController {
}
I was fairly frustrated with this issue as none of the answers above had solved my problem.
In my case: I was in the middle of working on swift view controller file and was making active changes (such as creating a custom collection cell class). I had not finished the code block and left it open like so :
class tableViewCell: UITableViewCell {
}
class collectionCell:
class viewController: UIViewController {
override func viewDidLoad(){
super.viewDidload()
}
}
Note the incomplete code block 'collectionCell2'
This was enough for xcode to not recognize my viewController file as such.
Once I completed this block the file reappeared in my xcode as an option.
Very silly and simple.
Make sure the view controller is matching with the same Type in the storyboard .
In my case swift file name was different then swift class name i.e
file name was ViewControllerTest.swift
and class name was ViewController.swift
after changing both to common name solved my problem
Restart Xcode after above changes
Make sure the class name of the ViewController is the name that you want. i.e.
class MyCustomNameViewController: UIViewController {
.
.
}
Changing just the filename is not enough.