Framework Bundles in Xcode and CocoaPods

An iOS SDK I am working on needs to find resources in its own bundle. Originally, I was doing this with the following snippet:

return Bundle(for: TaskMeAuthenticator.self)

This would work well within Xcode and when I embedded the resulting framework by myself without any CocoaPods integration. However, when I tried to move over to building a CocoaPods repo for the SDK, I quickly encountered crashes because resources were no longer found in this bundle. Frantic Google searches showed that this was not uncommon: the fix was to look inside the bundle for another one which would then contain the actual resources, something like this:

return Bundle(path: Bundle(for: TaskMeAuthenticator.self)
    .path(forResource: "TaskMe", ofType: "bundle")!)!

Yeah, the double presence of ! is smelly, but it worked. However, this incantation would then fail in Xcode without CocoaPods. Finally, I fixed it all with the following safer version:

let bundle = Bundle(for: TaskMeAuthenticator.self)
if let path = bundle.path(forResource: "TaskMe", ofType: "bundle") {
    if let inner = Bundle(path: path) {
        return inner
    }
}
return bundle

So far, so good.

Apparently, the difference is that CocoaPods will create a separate named bundle for resources. This is of course mentioned in their docs somewhere, but I was not fully aware of what this meant until the crashes started.

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