无法构建 Objective-C 模块“_SwiftUIKitOverlayShims”

Question

在Xcode8.3.3项目不会有问题，但升级到xcode9后，编译器有问题！

显示最近的问题

CompileSwift 正常 arm64

/Users/leekexi/Documents/macsrc/mtom/modules/ScrollerRefresh/RefreshConst.swift
    cd /Users/leekexi/Documents/macsrc/mtom
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -c -filelist /var/folders/cz/jq8bwvds0j52yy2j0p7_2kf40000gn/T/sources-86be14 -primary-file /Users/leekexi/Documents/macsrc/mtom/modules/ScrollerRefresh/RefreshConst.swift -target arm64-apple-ios8.0 -Xllvm -aarch64-use-tbi -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS11.0.sdk -I /Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Products/Debug-iphoneos -F /Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Products/Debug-iphoneos -F /Users/leekexi/Documents/macsrc/mtom/Pods/RongCloudIM/RongCloudIM -F /Users/leekexi/Documents/macsrc/mtom/modules -F /Users/leekexi/Documents/macsrc/mtom/modules/Live/IJKMediaPlayer -F /Users/leekexi/Documents/macsrc/mtom -enable-testing -g -module-cache-path /Users/leekexi/Library/Developer/Xcode/DerivedData/ModuleCache -swift-version 4 -enforce-exclusivity=checked -D DEBUG -serialize-debugging-options -Xcc -I/Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/mtom.build/Debug-iphoneos/mtom.build/swift-overrides.hmap -Xcc -iquote -Xcc /Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/mtom.build/Debug-iphoneos/mtom.build/mtom-generated-files.hmap -Xcc -I/Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/mtom.build/Debug-iphoneos/mtom.build/mtom-own-target-headers.hmap -Xcc -I/Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/mtom.build/Debug-iphoneos/mtom.build/mtom-all-target-headers.hmap -Xcc -iquote -Xcc /Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/mtom.build/Debug-iphoneos/mtom.build/mtom-project-headers.hmap -Xcc -I/Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Products/Debug-iphoneos/include -Xcc -I/Users/leekexi/Documents/macsrc/mtom/Pods/Headers/Public -Xcc -I/Users/leekexi/Documents/macsrc/mtom/Pods/Headers/Public/RongCloudIM -Xcc -I/Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/mtom.build/Debug-iphoneos/mtom.build/DerivedSources/arm64 -Xcc -I/Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/mtom.build/Debug-iphoneos/mtom.build/DerivedSources -Xcc -DDEBUG=1 -Xcc -DCOCOAPODS=1 -Xcc -working-directory/Users/leekexi/Documents/macsrc/mtom -emit-module-doc-path /Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/mtom.build/Debug-iphoneos/mtom.build/Objects-normal/arm64/RefreshConst~partial.swiftdoc -serialize-diagnostics-path /Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/mtom.build/Debug-iphoneos/mtom.build/Objects-normal/arm64/RefreshConst.dia -import-objc-header /Users/leekexi/Documents/macsrc/mtom/mtom-bridging.h -pch-output-dir /Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/PrecompiledHeaders -pch-disable-validation -Onone -module-name mtom -emit-module-path /Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/mtom.build/Debug-iphoneos/mtom.build/Objects-normal/arm64/RefreshConst~partial.swiftmodule -emit-dependencies-path /Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/mtom.build/Debug-iphoneos/mtom.build/Objects-normal/arm64/RefreshConst.d -emit-reference-dependencies-path /Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/mtom.build/Debug-iphoneos/mtom.build/Objects-normal/arm64/RefreshConst.swiftdeps -o /Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Build/Intermediates.noindex/mtom.build/Debug-iphoneos/mtom.build/Objects-normal/arm64/RefreshConst.o -index-store-path /Users/leekexi/Library/Developer/Xcode/DerivedData/mtom-aecafhlecijtaebzvztitxjcabvr/Index/DataStore -index-system-modules

<module-includes>:1:9: note: in file included from <module-includes>:1:
#import "UIKitOverlayShims.h"
        ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/shims/UIKitOverlayShims.h:24:11: error: use of undeclared identifier 'UIFocusSystem'
  return [UIFocusSystem environment:environment containsEnvironment:otherEnvironment];
          ^
<unknown>:0: error: could not build Objective-C module '_SwiftUIKitOverlayShims'

Answer 1

the mentioned forum thread 中的此修复程序为我修复了它：只需删除有问题的代码！

打开错误指向的文件（/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/shims/UIKitOverlayShims.h 大多数人）。
删除方法 _swift_UIKit_UIFocusEnvironmentContainsEnvironment，加上周围的编译器指令。

我在那之后重建只是为了确定，但这可能没有必要。

这绝对是一个解决方法；希望这将在 Xcode.

的未来版本中得到修复

Answer 2

对我来说 Xcode 9.0.1 的解决方案是典型的工程师解决方案：

清理项目
擦除派生数据
重启电脑

无法构建 Objective-C 模块“_SwiftUIKitOverlayShims”

Could not build Objective-C module '_SwiftUIKitOverlayShims'

swift4

xcode9