用 Swift 3.0编译的模块不能在 Swift 3.0.1中导入

我将 Xcode 升级到了8.1 GM，现在得到了 SwiftyJSON 的以下错误。其他导入的框架似乎也可以工作。在 SwiftyJSON 升级他们的框架之前，有没有一种方法可以强制这个在 Swift 3中工作？我使用 Carthage 来导入/更新框架。我也尝试改变 Use Legacy Swift language version开和关，但没有用。

用 Swift 3.0编译的模块不能在 Swift 3.0中导入。1: 模块/SwiftyJSON.ift 模块/arm64.ift 模块

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Make sure you've placed the new XCode 8.1 GM package in your Applications folder. We ran into this issue when one of us was running Carthage to update our dependencies, but had not replaced the XCode old 8.0 application in the applications folder (8.1 GM was running off the Desktop).

You want to make sure that when you run the following in terminal: xcrun swift -version that it returns Apple Swift version 3.0.1.

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最佳答案

SwiftyJson is being downloaded precompiled by carthage. The precompiled download is with Swift Version 3.0. That makes the compiler complain that the version is not correct. Using the following command: 

carthage update --platform iOS --no-use-binaries

SwiftyJson (and all other frameworks within Carthage) will be compiled locally using the local version of Swift (3.0.1) and the compiler will not complain anymore.

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Remove the app chache from DerivedData, and rebuild. the error may be fixed.

The DerivedData path like this:

~/Library/Developer/Xcode/DerivedData/
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I had exactly the same issue with the library XCTest_Gherkin, what it worked for me was:

  1. Product -> Scheme -> XCTest-Gherkin
  2. Product -> Build

Hope it helps. I am using Cocoapods.

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Just like @zirinisp said:

  1. You can Using the following command:carthage update --platform iOS --no-use-binaries
  2. Using the following command:xcrun swift -version to see the Swift version
  3. Do this: Xcode->preferences->locations to clear the derived data and archives data, the most important to change the command line tools to "Xcode 8.1"
  4. Using the following command:xcrun swift -version,you can see the swift version is 3.0.1
  5. Set Use Legacy Swift Language Version = NO

I hope it will help you

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Updating default Xcode to new one on terminal worked for me.

Step 1 : Use following command to update Xcode version to latest on Terminal. Ref

sudo xcode-select -switch <path/to/>Xcode.app

Step 2 : Now try carthage update command

carthage update --platform iOS
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Just to give the latest updates:

Carthage has released version 0.20 on Feb 27, 2017.

Carthage now only uses the pre-build binary if available pre-build binary is compatible.

That is being said, you no longer have to use: --no-use-binaries to avoid incompatible pre-build framework.

So make sure that you have carthage version greater than 0.20 and simply do:

carthage update --platform iOS
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In Xcode Build Settings make sure your Framework Search Paths contain the appropriate Carthage Build folder:

$(inherited)
$(PROJECT_DIR)/Carthage/Build/iOS
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  1. Move the beta/GM version if the Xcode to /Applications folder and name it Xcode-beta

  2. Check the output of:

    xcrun swift --version

by running this command in terminal, its output should match with the swift version you want the app to compile, because Carthage uses output of this command, to determine the local Swift version.

  1. Update Xcode version to latest on Terminal by running following command:

    sudo xcode-select -s /Applications/Xcode-beta.app/

  2. Build the libraries for iOS and prevents Carthage from downloading existing (yet incompatible) precompiled binaries, by running following command:

    carthage update --platform iOS --no-use-binaries

  3. Clean & Build


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