ios Xcode 9 - 无法发出预编译头文件
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/46293028/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Xcode 9 - failed to emit precompiled header
提问by Shubham
I have a project in Objective-C as well as in swift by taking MyProjectName-Bridging-Header.hand i also configured the Objective-C Bridging Header.
Also i have added 'MyprojectName-Swift.h' in .pch file.
我在 Objective-C 和 swift 中都有一个项目，MyProjectName-Bridging-Header.h我还配置了 Objective-C 桥接头。我还在 .pch 文件中添加了“MyprojectName-Swift.h”。
This works fine on xcode 8.2 but when i build my project from xcode 9 i am getting the below error.
这在 xcode 8.2 上工作正常，但是当我从 xcode 9 构建我的项目时，我收到以下错误。
failed to emit precompiled header '/Library/Developer/Xcode/DerivedData/MyprojectName-lajanjvhqjnfjksdsndsfkads/Build/Intermediates.noindex/PrecompiledHeaders/MyprojectName-Bridging-Header-swift_44AHJm3Z96qu-clang_2BIMGQVXGEZ09.pch' for bridging header '/Documents/MyProjectLocaiton/FoneApp-Bridging-Header.h'
未能发出预编译的头文件 '/Library/Developer/Xcode/DerivedData/MyprojectName-lajanjvhqjnfjksdsndsfkads/Build/Intermediates.noindex/PrecompiledHeaders/MyprojectName-Bridging-Header-swift_44AHJm3Z96qu-clang_2BIMGQVXpingsfkads/MyprojectName-lajanjvhqjnfjksdsndsfkads/Build/Intermediates.noindex/PrecompiledHeaders/MyprojectName-Bridging-Header-swift_44AHJm3Z96qu-clang_2BIMG9.VXpgings/MyProjectName-lajanjvhqjnfjksdsndsfkads/ Bridging-Header.h'
Please help me out from this. Thanks!
请帮我解决这个问题。谢谢！
采纳答案by Shubham
Finally i got the solution of this issue.
In my project the Prefix Headerpath is not clearly defined. Earlier the path was
最后我得到了这个问题的解决方案。在我的项目中，Prefix Header路径没有明确定义。之前的路径是
$(SRCROOT)/MyPrefixHeaderFile.pch
$(SRCROOT)/MyPrefixHeaderFile.pch
MyPrefixHeaderFile.pchis in another folder inside the project folder, So i update the Prefix Headerpath to
MyPrefixHeaderFile.pch位于项目文件夹内的另一个文件夹中，因此我将Prefix Header路径更新为
$(SRCROOT)/FolderName/MyPrefixHeaderFile.pch
$(SRCROOT)/FolderName/MyPrefixHeaderFile.pch
回答by ua24
Read this if you using cocoapods in project. I just update deployment target to iOS 10 or 11 in my case after updating pods and xcode make first build success. So problem was inside podfile where I had line
如果您在项目中使用 cocoapods，请阅读此内容。在我的情况下，我只是在更新 pods 和 xcode make first build 成功后将部署目标更新到 iOS 10 或 11。所以问题出在我有线路的 podfile 里面
platform :ios, '11.0'
and my deployment target in project was 9.0 after I change my podfile to platform to
在我将 podfile 更改为平台后，我在项目中的部署目标是 9.0
platform :ios, '9.0'
project was fixed.
项目已修复。
回答by nikdange_me
I found out that I accidentally opened the ProjectName.xcodeprojfile rather than the ProjectName.xcworkspacefile.
我发现我不小心打开了ProjectName.xcodeproj文件而不是ProjectName.xcworkspace文件。
Open the xcworkspacefile, project will start working again!
打开xcworkspace文件，项目将重新开始工作！
回答by Harris
Also make sure your import of "ProductModuleName-Swift.h" is in your .m file, and not your .h file.
还要确保您导入的“ProductModuleName-Swift.h”在您的 .m 文件中，而不是您的 .h 文件中。
回答by Li Yakun
Maybe you create a new target, but you didn't add this at podfile
也许您创建了一个新目标，但是您没有在 podfile 中添加它
回答by Anand
When you are getting this error in terminal upon running the xcodebuild command, do make sure you pass -workspace YourWorkspace.xcworkspace
当您在运行 xcodebuild 命令时在终端中收到此错误时，请确保通过 -workspace YourWorkspace.xcworkspace
回答by Okan
You can try this solution. I have solved the same problem by this way.
你可以试试这个解决方案。我已经通过这种方式解决了同样的问题。
Product > Scheme > Edit Scheme > Select "Build" on Left Menu > Find implicit dependencies
产品 > 方案 > 编辑方案 > 在左侧菜单上选择“构建”> 查找隐式依赖项
Under the build tab, check 'Find implicit dependencies':
在构建选项卡下，选中“查找隐式依赖项”：
Then make a clean and build again.
然后进行清理并再次构建。
回答by Alessio Campanelli
in my point of view I solved simply switch the order of import statements and build works fine.
在我看来，我解决了简单地切换导入语句的顺序并且构建工作正常。
回答by Benzi Heler
In my case I had the same compiler error with additional errors like "Unknown type" in one of my project files, So I just added this to the problematic file, and it solved it instantly.
在我的情况下，我的一个项目文件中出现了相同的编译器错误和其他错误，例如“未知类型”，所以我只是将其添加到有问题的文件中，它立即解决了它。
#import <UIKit/UIKit.h>
#import <UIKit/UIKit.h>
回答by Marc-Alexandre Bérubé
Adding my very own situation to the loop.
将我自己的情况添加到循环中。
In my bridging header file, le'Ts say I added an import
在我的桥接头文件中，我说我添加了一个导入
#import "File.h"
#import "File.h"
Inside the File.hheader file, there was a type referenced from an import that was inside the Prefix.pch, had to add the missing #import in my File.h
在File.h头文件中，有一个类型引用自 Prefix.pch 中的导入，必须在我的 File.h 中添加缺少的 #import
