How to exclude RealityKitContent from Swift package for iOS

Development Package Manager
,
1

I've created an app for visionOS that uses a custom package that includes RealityKitContent as well (as a sub-package). I now want to turn this app into a multi-platform app that also supports iOS.

When I try to compile the app for this platform, I get this error message:

Building for 'iphoneos', but realitytool only supports [xros, xrsimulator]

Thus, I want to exclude the RealityKitContent from my package for iOS, but I don't really know how. The Apple docs are pretty complicated, and ChatGPT did only give me solutions that did not work at all.

So I am trying my luck with the real guys instead :slight_smile:

Here's my Package.swift file:

// swift-tools-version: 5.10

import PackageDescription

let package = Package(
    name: "Overlays",
    platforms: [
        .iOS(.v17), .visionOS(.v1)
    ],
    products: [
        .library(
            name: "Overlays",
            targets: ["Overlays"]),
    ],
    dependencies: [
        .package(
            path: "../BackendServices"
        ),
        .package(
            path: "../MeteorDDP"
        ),
        .package(
            path: "Packages/OverlaysRealityKitContent"
        ),
    ],
    targets: [
        .target(
            name: "Overlays",
            dependencies: ["BackendServices", "MeteorDDP", "OverlaysRealityKitContent"]
        ),
        .testTarget(
            name: "OverlaysTests",
            dependencies: ["Overlays"]),
    ]
)
2

I don't really see what's complicated about the Apple docs?

Off the top of my head:

.target(
    name: "Overlays",
    dependencies: [
        "BackendServices", "MeteorDDP",
        .product(name: "OverlaysRealityKitContent", condition: .when(platforms: [.visionOS]))
    ]
),
1 Like
3

Thanks. Unfortunately, it does not work. It expects an additional "package" string. I tried to set this to "OverlaysRealityKitContent", but this won't compile either.

As a side-note: Any combination I tried before where this was still included

dependencies: [
        ...
        .package(
            path: "Packages/OverlaysRealityKitContent"
        ),
    ],

lead to the error message

Building for 'iphoneos', but realitytool only supports [xros, xrsimulator]

Not sure if patching the targets alone will fix this.

(Regarding the Apple docs in general: I really don't think they are comprehensible. Way too scarce, and almost always without concrete usage examples. I struggled with this a lot when I started learning Swift (and especially SwiftUI for visionOS). I have a decent development background as a full stack web dev with a lot of different frameworks, plus C# and Unity, and I think Apple's docs are by far the worst I've seen so far. Even worse than Unity's, actually.)

4

For the package argument, you can try explicitly specifying the package name of your dependency.

dependencies: [
    ...
    .package(
        name: "OverlaysRealityKitContent",
        path: "Packages/OverlaysRealityKitContent"),
]

I don't know of a way to prevent Xcode (or SwiftPM) from trying to compile an unused dependency. I haven't played with realitytool either so I don't think I can help you on that side.

As for Apple docs, I now understand what you meant and certainly agree! They're barely useful, usually sparse and lack pretty much all of the critical information one might need. Sorry I have a lot of frustration with them.. I usually need to check the Cocoa documentation archive (or man pages!).

1 Like
5

Thanks, this resolves the package resolution, but I still get the error message about the realitytool.