How to access a swift file from an objective file, while both of them are in Unit Test?

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This problem may still baffling many people, but there is no answer to this question yet.

I have 2 files, both are in the Unit Test directory.
1. A swift extension to NSError. Lets call it NSErrorExtension.swift. This extensions contains some static methods.
2. an objective C test class, lets call it UnitTest1.m .

Now, I want to access the static methods in NSErrorExtension.swift from UnitTest1.m. How do I do this? It just tells me that "No known class methods for selector...." I tried many solutions, none of them works.

swift xcode objective-c unit-testing
1 Answers

Run into the same issue, seems the MyAppTests-Swift.h is not very "importable" :)

I had to resort to some not-so-nice workarounds to make this work. For class instantiation I used NSClassFromString() and then cast to a protocol visible on the Objective-C side. For your extension you could do something similar by declaring the methods in a header file, without actually implementing them.

So assuming your NSErrorExtension.swift extension looks like this:

extension NSError {
    @objc func someFunc() -> SomeResult
}

, you can create a NSErrorExtension.h file (without a corresponding .m one):

@interface NSError (UnitTestExtensions)
- (SomeResult *)someFunc;
@end

This should make the function available on the Objective-C side. The downside is that you'll need to do this for every function you want to expose from the Swift side of the unit tests.

user_19742240
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