How can method in Swift with inout parameter be used in Objective-C?

Question

I want

func foo(inout stop: Bool) -> Void {
    // ...
}

use in my Objective-C part. But it is never generated in Module-Swift.h header. If

Answer 1

Similarly to what happening with generics, inout is not objc-compatible.

One possible workaround is to embed your parameter(s) in a class (which is a reference type, hence passed by pointer and not by value):

@objc class MyFuncParams {
    var stop: Bool

    init(stop: Bool) {
        self.stop = stop
    }
}

and define the function to accept an instance of that class:

func changeParam(params: MyFuncParams) {
    params.stop = true
}

Not an elegant way to solve the problem, but what's important is that it should work (never tried myself though).