如何在Swift中有选择地导入框架? [英] How do you selectively import a framework in Swift?

问题描述

我有一个需要iOS和tvOS使用的共享框架，但是我想选择性地仅导入iOS框架(CoreTelephony).快速的语法说您可以添加一个属性，但这是行不通的:

I have a shared framework that needs to be used by iOS and tvOS, but I want to selectively import a framework for iOS only (CoreTelephony). The swift grammar says you can prepend an attribute, but this doesn't work:

@available(iOS 10.0, *) import CoreTelephony

@available(iOS 10.0, *) import CoreTelephony

这根本不被支持吗?我是否需要子类化才能导入iOS特定框架?

Is this simply not supported? Do I need to subclass just to import the iOS specific framework?

推荐答案

对于Swift< = 4.0，您可以使用os()配置测试功能:

For Swift <= 4.0 you can use the os() configuration test function:

#if os(iOS)
  import CoreTelephony
#endif

您还必须包装使用CoreTelephony的代码.

You'll have to wrap code that uses CoreTelephony as well.

os()的所有可用测试是:macOS，iOS，watchOS，tvOS，Linux，Windows和FreeBSD.

All available tests for os() are: macOS, iOS, watchOS, tvOS, Linux, Windows, and FreeBSD.

对于Swift> = 4.1，您还可以使用 canImport() :

For Swift >= 4.1 you can also use canImport():

#if canImport(CoreTelephony)
  import CoreTelephony
#endif

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