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Assume you have a working swift package that previews a view see the following question on how to achieve that (https://developer.apple.com/forums/thread/651547?login=true&page=1#617372022). Note make sure your view is in the root folder of the package or live previews will not work.
Add a dependency to the package. Example shown below
The Problem
Currently when you add a swift package manager dependency to a swift package in which you want to view a live preview you receive the following error:
The Question
How do you view live previews of a SwiftUI view in Xcode 12 Swift Package assuming you have a newly created swift package with another swift package as a dependency?
Note: This may be a bug on Apple's part and if I do not see a response in a few days will file a bug report in feedback assistant.
Live Preview Diagnostics:
build aborted due to an internal error: planningFailed("multiple configured targets of \'SwiftyStoreKit\' are being created for iOS Simulator")
SchemeBuildError: Failed to build the scheme "TestPackagePreview"
unexpected service error: build aborted due to an internal error: planningFailed("multiple configured targets of \'SwiftyStoreKit\' 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 \'SwiftyStoreKit\' are being created for iOS Simulator")
Package.Swift:
// 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: "TestPackagePreview",
platforms: [
.iOS(.v13)
],
products: [
// Products define the executables and libraries a package produces, and make them visible to other packages.
.library(
name: "TestPackagePreview",
targets: ["TestPackagePreview"]),
],
dependencies: [
.package(url: "https://github.com/bizz84/SwiftyStoreKit.git", .branch("master"))
],
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: "TestPackagePreview",
dependencies: ["SwiftyStoreKit"]), // this causes the error in preview, but is needed to use the dependency throughout package.
.testTarget(
name: "TestPackagePreviewTests",
dependencies: ["TestPackagePreview"]),
]
)