Swift Package Manager - UIKit Dependency

I have a Package.swift in my project like:

import PackageDescription

let package = Package(
    name: "ProjectName",
        dependencies: [
           .Package(url: "https://github.com/example/repo.git", majorVersion: 0)
        ]
 )

When I run swift build I get errors like…

/project/Packages/WebViewController.swift:1:8: error: no such module 'UIKit'
import UIKit
       ^

Where should I tell the swift package manager where to find UIKit?

Solution 1:

You have to change some swiftc options to build the project against proper sdk and target

swift build -Xswiftc "-sdk" -Xswiftc "`xcrun --sdk iphonesimulator --show-sdk-path`" -Xswiftc "-target" -Xswiftc "x86_64-apple-ios13.0-simulator"

Solution 2:

Currently Swift Package Manager has full Xcode support. I was able to get around this error by specifying in my Package.swift manifest that the platform was iOS.

let package = Package(
    name: "MyPackage",
    platforms: [
        .iOS(.v8)
    ],

Then you can open the Package.swift file in Xcode and it will just work.

Solution 3:

Make it work without limit the platforms:

You should select an iOS-based target to make it available:

Demo

_{If you leave it selecting macOS (by default), you will get the error.}

Limit to a specific platform

if you want your package to be available only for specific platforms (for example only for iOS), you should specify the platform in the package.swift file:

let package = Package(
    name: "MyLibrary",
    platforms: [
        .iOS(.v10)
    ],
    products: [
,,,

Support Multiplatform

If you need your framework to be available on multiple platforms, don't forget to check the availability of the imported framework like:

#if canImport(UIKit)

import UIKit

#endif