rules_swift

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Hi, I'm trying to build a fairly complex app, which has a mix of Swift and Objective-C.

The Swift code relies heavily on a bridging header, which itself imports a number of headers. Here's a snippet of App-Bridging-Header.h:

#import "Constants.h"
#import "CJAMacros.h"
... (many more headers)

Each of the imported headers lives in a different directory. Xcode makes that work (I'm not sure how), but I'm not sure how to do this with Bazel.

How can this header, and all its dependencies, be declared with Bazel? How can they be used from a swift_library target?

Thank you 🙃

same for me

I wasn't able to find official documentation that covers this, but this is what I've found that works:

1. Set the module_name on your objc_library targets (or rely on the default value as described in the objc_library documentation)
2. List the objc_library targets as deps of your swift_library
3. Use import [obj_module_name] in your .swift code

For example:

objc_library(
    name = "foo_lib",
    srcs = ["Bar.m"],
    hdrs = ["Bar.h"],
    module_name = "FooLib",
)

swift_library(
    name = "baz_lib",
    srcs = ["Baz.swift"],
    deps = [":foo_lib"],
)

// Baz.swift
import FooLib

let bar = Bar()