How to reference Swift protocol from Objective-C header

Question

I can't reference SomeSwiftProtocol from my Objective-C header files.

Do you know how can it be done?

---

My protocol is defined like this:

@objc protocol SomeSwiftProtocol : class {
  func someFunc()
}

It is well defined (not like here) because I can use it from .m files by importing the Swift bridging header:

#import "MyProject-Swift.h"

But that import is not found when I put it in .h files.

For example, this is SomeClass.h:

// This import is not found...
#import "MyProject-Swift.h"

// ...so the protocol is not found
@interface SomeClass : UIView<SomeSwiftProtocol>
@end