Could not insert new outlet connection: Could not

问题:

I got an error on Xcode saying that there was no information about the view controller.

Could not insert new outlet connection: Could not find any information for the class named

Why is this happening?

回答1:

Here are some things that can fix this (in increasing order of difficulty):

• Clean the project (Product > Clean)

• Manually paste in

  @IBOutlet weak var viewName: UIView!
  // or
  @IBAction func viewTapped(_ sender: Any) { }
  

  and control drag to it. (Change type as needed.) (Idea from this answer. Please upvote it.)

• Completely close Xcode and restart your project.

• Delete the Derived Data folder (Go to Xcode > Preferences > Locations and click the gray arrow by the Derived Data folder. Then delete your project folder.)
• Click delete on the class, remove reference (not Move to Trash), and add it back again. (see this answer)

回答2:

Or if none of the above works, type out the name of the outlet into the file first @IBOutlet weak var headerHeightConstraint: NSLayoutConstraint! and then click and drag from the outlet in the nib to the variable you just programmatically created. It should work without any of the hassle of cleaning, building, and deleting anything.

回答3:

Just perform the two following steps to get rid of this error

1. Clean project using Product > clean
2. Run the project

Now try to add the action or outlet. That's it.

Happy Coding

回答4:

None of the tips in the best answer worked for me. Was going crazy. Then noticed that the Assistant Editor had somehow gotten set to Manual and I was on the ViewController.swift (Interface) instead of the ViewController.swift file.

Changed that and problem solved. A bit embarrassing but hey, we are all learning.

回答5:

Here are the steps solved for me:

1. Remove Class name reference from View(storyboard/xib) and save;
2. Add Class name again and save;
3. Clean and Build;

Done !

回答6:

I had the same issue. I tired below solutions but didn’t worked :

1. Clean Project (cmd + shift + k) and even Clean Project Build (cmd + shift + alt + k)
2. Deleted Derived data and Module Cache content

Below workaround to this issue :

1. Move to source code file and write the IBOutlet / IBAction manually (copy paste preferred)

2. Then move to Storyboard file and Open Utilites window
3. Goto Connection Inspector
4. Then Connect the IBOutlet and IBAction written in source file with Interface Builder.

回答7:

I had the same problem. I realised than in X-Code Manual item was selected when I tried to create an outlet by control-drag

After I set it to automatic it worked

回答8:

I solved this problem by programmatically creating the Labels and Textfields, and then Command-Dragged from the little empty circles on the left of the code to the components on the Storyboard. To illustrate my point: I wrote @IBOutlet weak var HelloLabel: UILabel!, and then pressed Command and dragged the code into the component on the storyboard.

回答9:

1. Close the project you are working on with.
2. Delete your project's【DerivedData】folder. (This folder may inside your project's folder, or inside
   ~/Library/Developer/Xcode/DerivedData/
   (your project)/) or somewhere else that was setup by you.
3. restart your project.

回答10:

I found an easier workaround as I this bug can be found on XCODE 9.

Step one go to your viewcontroller and manually write the property you want to connect as the below example, make sure you use the below format.

@IBOutlet weak var questionsStackView: UIStackView!

Step two go to your storyboard and connect your view or whatever your trying to connect to the property you created in step 1.

The above will save you time of removing and cleaning derived data.

回答11:

In my case this was bc I chose a new UIViewController file in IB and then tried to ctrl-drag to this new controller without first removing the previous connections in the Connections Inspector. Remove those first and try again.

回答12:

For me it worked when on the right tab > Localization, I checked English check box. Initially only Base was checked. After that I had no more problems. Hope this helps!

回答13:

I got this bug when I renamed the class. Then I solved it just by following the below steps

• In Xcode Menu -> Product -> Clean
• Restart the Xcode

回答14:

I selected Automatic option to select the ViewController.swift file. And then I can able to take outlets.

回答15:

Please perform the following two steps only to get rid of this error.

1.  Clean Project using Product -> clean.
2.  Run the Project.

Now try to add/Connect the actions or outlets.

Working Fine for me for many times.

回答16:

Simplest solution:- I used xCode 7 and iOS 9.

in your .m

delete #import "VC.h"

save .m and link your outlet again it work fine.

回答17:

I used xCode 7 and iOS 9.

in your .m

delete #import "VC.h"

save .m and link your outlet again it work fine.

in your .m

add #import "VC.h"

save .m

回答18:

None of this worked for me but I did figure this out.

Inside the storyboard I copied the corresponding ViewController into the clipboard and deleted it, afterwards I pasted it again.

Suddenly everything was working like a charm again!

回答19:

It happened when I added a Swift file into an Objective-C project .
So , in this situation what you can do is . .

• Select MY_FILE.Swift >> Delete >> Remove Reference
• Select MY_FOLDER >> Add MY_FILE.Swift
• Voila ! You are good to go .