How do I implement a Swift Package Manager with resources specific to a platform

Lunar · August 8, 2023, 7:55am

I have files like iOS and macOS storyboards and videos that are specific to iOS or macOS respectively.

All resources that are specific to iOS are in the Sources/iOS, all resources specific to macOS are in the Sources/MacOS and all shared files and resources are under Sources/Shared.

How do I create the package manifest so when I add this to a multi-platform project, only the iOS part compiles to the iOS target and only the macOS part compiles to the macOS target?

I have this manifest

import PackageDescription

let package = Package(
    name: "MyPackage",
    defaultLocalization: "en",
    platforms: [
      .macOS(.v10_15),
      .iOS(.v14),
    ],
    products: [
        // Products define the executables and libraries a package produces, and make them visible to other packages.
        .library(
            name: "MyPackage",
            targets: ["MyPackage"]),
    ],
    dependencies: [
        // Dependencies declare other packages that this package depends on.
        // .package(url: /* package url */, from: "1.0.0"),
    ],
    targets: [
        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
        // Targets can depend on other targets in this package, and on products in packages this package depends on.
      .target(
        name: "MyPackage",
        dependencies: [
          "SharedTarget",
          .target(name: "iOSTarget", condition: .when(platforms: [.iOS])),
          .target(name: "macOSTarget", condition: .when(platforms: [.macOS])),
        ],
        path: "Sources"
      ),
        .target(
            name: "SharedTarget",
            dependencies: [],
            path: "Sources/Shared"),
        .target(
          name: "iOSTarget",
          dependencies: [
            "SharedTarget"
          ],
          path: "Sources/iOS"),
        .target(
          name: "macOSTarget",
          dependencies: [
            "SharedTarget"
          ],
          path: "Sources/MacOS"),
    ]
)

but this gives me this error

public headers ("include") directory path for 'iOSTarget' is invalid or not contained in the target

I promise the directories exist and are named correctly.

Another error also shows

Package resolution failed; see package resolution log for details

But Apple "forgot" to tell where this log is...

If I comment all targets except for the shared one, I have this error

Target MyPackage has overlapping sources

This is the directory structure I have.

Thanks