cocoaiosswiftxcode
I've created new Cocoa Touch File. Named it SwipingViewController.
Then try to add Custom Class to ViewController.
And when I run the app I receive an error
2015-10-09 10:53:25.054 ParseStarterProject[5369:389307] Unknown class SwipingViewController in Interface Builder file.
Related:
Xcode 6 Strange Bug: Unknown class in Interface Builder file
Here is my projects files
I've had this error many times. While TechZen's answer is absolutely right in this case, another common cause is when you change the name of a IBOutlet property in your .h/.m which you've already connected up to File's Owner in the nib.
From your nib:
Under 'Referencing Outlets' make sure that your object isn't still connected to the old property name... if it is, click the small 'x' to delete the reference and build again.
Another common cause if you are using Storyboard, your UIButton might have more then one assignings (Solution is almost the same as for nib):
You will see that there is more than one assign/ref to this button. Remove one of the "Main..." greyed windows with the small "x":
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Best Answer
In storyboard below the Custom Class field the module is set to None. Change that to your app module or just remove and enter class again, it should set to default like this: