#if canImport(CoreImage) 在 swift 包管理器中不起作用

我制作使用 CoreImage 的库。库支持 Cocoapods、Carthage 和 Swift 包管理器。

当我在 Swift 包管理器中构建它时，我收到此错误：

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_CIFilter", referenced from:
      objc-class-ref in EIP67Code.swift.o
  "_OBJC_CLASS_$_CIImage", referenced from:
      objc-class-ref in EIP67Code.swift.o
ld: symbol(s) not found for architecture x86_64

当我使用#if canImport(CoreImage)

#if canImport(CoreImage)
import CoreImage
extension Web3 {
  public struct EIP67CodeGenerator {
    public static func createImage(from: EIP67Code, scale: Double = 1.0) -> CIImage {
      guard let string = from.toString().addingPercentEncoding(withAllowedCharacters: .urlHostAllowed) else { return CIImage() }
      guard let data = string.data(using: .utf8, allowLossyConversion: false) else { return CIImage() }
      let filter = CIFilter(name: "CIQRCodeGenerator", parameters: ["inputMessage" : data, "inputCorrectionLevel":"L"])
      guard var image = filter?.outputImage else { return CIImage() }
      let transformation = CGAffineTransform(scaleX: CGFloat(scale), y: CGFloat(scale))
      image = image.transformed(by: transformation)
      return image
    }
  }
}
extension Web3.EIP67Code {
  public func toImage(scale: Double = 1.0) -> CIImage {
    return Web3.EIP67CodeGenerator.createImage(from: self, scale: scale)
  }
}
#endif

如果我使用的话效果很好#if os(iOS) || os(tvOS)

但 CoreImage 在 macOS 上工作，所以我仍然需要这段代码，至少对于 carthage/cocoapods

没有找到任何解决方案，所以我只是在 Package.swift 中排除了这个文件

.target(
name: "web3swift",
dependencies: ["BigInt", "secp256k1", "keccak", "scrypt", "PromiseKit", "base58"],
exclude: ["ObjectiveC", "Utils/EIP67Code.swift", "Migration-iOS.swift"]
),