blocks|key|133167|text|在我的一个项目中，我遇到了类似的问题，接下来我如何解决这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|133168|我发现CocoaPods是问题所在。|133169|我将CocoaPods从我的项目中删除(如果您不知道如何执行该操作，请检查此How+to+remove+CocoaPods+from+a+project?)|ordered-list-item|offset|length|133170|不要忘记，如果您有单元&+ui测试，您也必须在上面的链接上重复第4步。|133171|将代码库升级到Swift+4|133172|再次安装吊舱，您就完成了。|133173|希望它有帮助:)|133174|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/16427421/how-to-remove-cocoapods-from-a-project^0|0|0|12|13|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@$G|11|H|12|1|13]]|A|$]]|$1|I|3|J|5|F|7|14|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|15|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|16|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|17|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

I had the similar problem in one of my projects and how I solved this is next:

I figured out that CocoaPods are the problem. 

<ol>
<li>I removed CocoaPods from my project (if you don't know how to do that check this <a href="https://stackoverflow.com/questions/16427421/how-to-remove-cocoapods-from-a-project">How to remove CocoaPods from a project?</a>)</li>
<li>Don't forget If you have unit &amp; ui tests you have to repeat 4th step from the link above on them as well. </li>
<li>Upgrade your code base to Swift 4</li>
<li>Install pods again and you are done. </li>
</ol>

Hope it helps :)

blocks|key|4544848|text|对我们来说，起作用的是删除UnitTest和UITests|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4544849|点击项目，然后“右键单击”->移除两个依赖项|4544850|希望它能帮上忙|4544851|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

for us what worked was to remove the UnitTest and UITests

Tap on your project and then "Right Click" -> Remove the two dependencies 

Hope it helps

blocks|key|296436|text|对我来说，从3.2到4.0的迁移失败了，当我尝试编辑>转换>到当前的Swift语法时，我总是会收到这个错误消息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|296437|我的修正很简单，将项目设置的快速版本从4.0设置为3.2，或者设置您所使用的任何版本。|296438|这是因为尽管第一次迁移失败了，Xcode已经将项目设置中的快速版本更改为4.0。|296439|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

For me, my migration from 3.2 to 4.0 failed, then I always get this error message when I try to Edit > Convert > To Current Swift Syntax...

My Fix is simple, set the project setting's swift version from 4.0 back to 3.2 or whichever version you were using. 

This is because although the first migration has failed, Xcode has changed the swift version to 4.0 in your project settings.

blocks|key|296412|text|确保所有目标都编译，包括测试。从项目中删除Cocoapods后删除NAME.xcworkspace|type|unstyled|depth|inlineStyleRanges|entityRanges|data|296413|这为我解决了问题。|296414|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Make sure that all the targets compile including the tests. delete NAME.xcworkspace once Cocoapods are removed from the project

This solved it for me.

blocks|key|296465|text|可能您放置在桥接头文件中的目标c类中至少有一个没有编译--注释掉桥接头文件中的所有条目，然后编译--它现在应该能够导入桥接头，但是由于找不到类，当然会产生很多错误。现在，逐行取消注释，找出哪些行导致导入失败，然后修复这些文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|296466|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Probably at least one of the objective c classes you put in your bridging header file is not compiling - comment out all your entries in the bridging header file, then compile - it should be able to import the bridging header now, but of course generate lots of errors because of classes not found. Now uncomment the lines one by one to find out which ones are causing the import to fail, and then fix those files.

blocks|key|4544805|text|在我的项目的构建设置和所有目标中更改了Swift语言版本之后，我不得不将中的函数声明更改为：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|4544806|+`func+application(_+application:+UIApplication,+didFinishLaunchingWithOptions+launchOptions:+[UIApplication.LaunchOptionsKey:+Any]?)+->+Bool+{+++++++++//+Override+point+for+customization+after+application+launch.+++++++++return+true+++++}`|code-block|syntax|javascript|4544807|entityMap^0|J|9|10|A|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

After changing the Swift Language Version in my Project's build settings and in all the targets I had to alter this function declaration in AppDelegate.swift to:

<code>
 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -&gt; Bool {
 // Override point for customization after application launch.
 return true
 }
</code>

blocks|key|296540|text|我所有的代码都在Swift+5中，除了我的一款Pods已经有几年没有更新了。那个吊舱用斯威夫特4号。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|296541|当我添加一个新的Swift5吊舱时，这个错误发生在我身上。|296542|所以，我要做的就是：|296543|更改受影响的Pod的Swift版本以匹配项目的其余部分|ordered-list-item|296544|​|296545|📷|atomic|offset|length|296546|296547|清洁工程|296548|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/3d9636d4b09c69fa9e7a05371d9126de.png|imageAlt^0|0|0|0|0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|13|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|14|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|15|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|16|8|@]|9|@$N|17|O|18|1|19]]|A|$]]|$1|P|3|J|5|6|7|1A|8|@]|9|@]|A|$]]|$1|Q|3|R|5|H|7|1B|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z|10|-4]]]]

All of my code is in Swift 5, except for one of my Pods which hasn't been updated in a few years. That pod uses Swift 4.
This error happened for me when I added a new Swift5 pod.
So, All I needed to do was:
<ol>
<li>Change Affected Pod's Swift version to match the rest of the project</li>
</ol>
<a href="https://i.stack.imgur.com/hGBlc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hGBlc.png" alt="enter image description here" /></a>
<ol start="2">
<li>Clean project</li>
</ol>

As apple has released Xcode 9 beta version with Swift 4.0 support. I have been trying to upgrade my code to Swift 4.0 from Swift 3.2. But it keeps giving me <code>failed to import bridging header</code> error whereas my project build successfully.
Xcode error detail:
<blockquote>
Convert to Current Swift Syntax Failed
Please ensure that all selected targets build successfully with the currently configured Swift version before attempting a migration.
</blockquote>
Has anybody faced the similar error while upgrading code base to swift 4.

Migration to Swift 4 from Swift 3.2 giving "failed to import bridging header " error

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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苹果已经发布了Xcode 9测试版，支持SWIFT4.0。我一直在尝试将我的代码从SWIFT3.2升级到SWIFT4.0。但它一直给我failed to import bridging header错误，而我的项目建设成功。Xcode错误详细信息：转换为当前Swift语法失败的在尝试迁移之前，请确保所有选定的目标都使用当前配置的Swift版本成功构建。有没有人在升级代码库时遇到过类似的错误？

问从SWIFT3.2迁移到Swift 4造成“未能导入桥接标头”错误
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