Xcode previews stop working in packages after adding a dependency

Question

Created Jul ’20

Replies 3

Boosts 0

Views 3k

Participants 4

I created a brand new swift package, added a simple SwiftUI view, and opened the canvas to view the preview. This all worked great. Then I added a dependency to my package. After adding the dependency previews stop working. Here is my final Package.swift

Code Block // swift-tools-version:5.3
// The swift-tools-version declares the minimum version of Swift required to build this package.
import PackageDescription
let package = Package(
		name: "MyTestPackage",
		platforms: [
				.iOS(.v14),
				.macOS(.v10_15)
		],
		products: [
				// Products define the executables and libraries a package produces, and make them visible to other packages.
				.library(
						name: "MyTestPackage",
						targets: ["MyTestPackage"]),
		],
		dependencies: [
				.package(url: "https://github.com/pointfreeco/swift-composable-architecture", from: "0.6.0")
		],
		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: "MyTestPackage",
						dependencies: [
								.product(name: "ComposableArchitecture", package: "swift-composable-architecture")
						]),
				.testTarget(
						name: "MyTestPackageTests",
						dependencies: ["MyTestPackage"]),
		]
)

The app compiles successfully via ⌘B, but the preview fails with the following error.

Code Block build aborted due to an internal error: planningFailed("multiple configured targets of \'ComposableArchitecture\' are being created for iOS Simulator")
----------------------------------------
SchemeBuildError: Failed to build the scheme "MyTestPackage"
unexpected service error: build aborted due to an internal error: planningFailed("multiple configured targets of \'ComposableArchitecture\' are being created for iOS Simulator")
Build system information:
error: unexpected service error: build aborted due to an internal error: planningFailed("multiple configured targets of \'ComposableArchitecture\' are being created for iOS Simulator")

Boost

Answer 1

SWM-IT OP

Sep ’20

We are facing the exact same issue - no solution so far
Daniel

1

Answer 2

LiveQuartz OP

Dec ’20

Similar issue with the same error message for me.
From a first library named "MyViews", I need to access a resource that is in a second library named "MyResources".
If I run my app, it is working but the Xcode Preview produces this error:

Code Block build aborted due to an internal error: planningFailed("multiple configured targets of \'MyResources\' are being created for iOS Simulator")
----------------------------------------
SchemeBuildError: Failed to build the scheme "ResourcesInAnotherModule"
unexpected service error: build aborted due to an internal error: planningFailed("multiple configured targets of \'MyResources\' are being created for iOS Simulator")
Build system information:
error: unexpected service error: build aborted due to an internal error: planningFailed("multiple configured targets of \'MyResources\' are being created for iOS Simulator")

My package is:

Code Block // swift-tools-version:5.3
// The swift-tools-version declares the minimum version of Swift required to build this package.
import PackageDescription
let package = Package(
    name: "MyPackage",
    platforms: [SupportedPlatform.iOS(.v14)],
    products: [
        .library(
            name: "MyViews",
            targets: ["MyViews"]),
        .library(
            name: "MyResources",
            targets: ["MyResources"]),
    ],
    targets: [
        .target(
            name: "MyViews",
            dependencies: ["MyResources"]),
        .target(
            name: "MyResources",
            dependencies: []),
    ]
)

I have open a bug in Apple's Feedback Assistant for that issue with my project sample, number FB8930185.

0

Answer 3

marlonjames OP

Dec ’20

I saw that someone on SO said they got it to work by adding type: .dynamic, to the products parameter after name in .library like so:

Code Block swiftproducts: [	
	.library(						
		name: "MyTestPackage",
		type: .dynamic,
		targets: ["MyTestPackage"]),		
],

2