Where I got stuck with Swift Package Manager support

Introduction

――Swift Package Manager is being handled more and more in iOS application development. In the future, I think that the number of existing libraries compatible with Swift Package Manager will increase. I summarized the addictive points in making the library compatible

environment

Xcode 12.2
Build version 12B45b
Apple Swift version 5.3.1 (swiftlang-1200.0.41 clang-1200.0.32.8)

OS branch

--Since Swift Package Manager supports OS other than iOS, some frameworks do not support it, so branching is essential.

#if os(iOS)
import UIKit

class HogeView: UIView {

}

#endif

• Package Manager Conditional Target Dependencies ――I haven't tried it, but I thought it would be possible to reduce the number of branches by using this function.

Calling Bundle

--Since Swift 5.3, resource files such as images and xib are supported. --With support, the way Bundles are called in the Swift Package Manager has changed. Calls such as images and Xib require branching. SwiftGen has also been changed for support.

#if SWIFT_PACKAGE && swift(>=5.3)
   let bundle = Bundle.module
#else
   let bundle = Bundle(for: Hoge.self)
#endif

Reference link

• https://github.com/apple/swift-evolution/blob/master/proposals/0271-package-manager-resources.md
• https://developer.apple.com/documentation/swift_packages/bundling_resources_with_a_swift_package
• https://github.com/SwiftGen/SwiftGen/pull/763
• https://qiita.com/chocoyama/items/f9721400cdb1a634be7d