我想再补充一个你可能会发现问题的原因——我正在创建一个混合了Swift和Objective-C代码的框架。我无法在框架外导入Swift类-我检查了-Swift.h文件，它正在生成但为空。

问题变得非常非常简单——我没有将我的任何Swift类声明为public!一旦我将public关键字添加到类中，我就可以从框架内外的类中使用它们了。

同样值得注意的是，在框架内(只有在。m文件内，另一个答案提到)，我必须导入-Swift.h文件:

#import <FrameworkName/FrameworkName-Swift.h>

我发现了一个对我很管用的小窍门。

Create your #import "ProductModuleName-Swift.h" in your appDelegate.h file and in your ProductName-Prefix.pch file. If you don't have it in xcode 6 you can create it with this way Why isn't ProjectName-Prefix.pch created automatically in Xcode 6? Command+shift+k to clean your code, if you receive an error about your "ProductModuleName-Swift.h" delete it from appDelegate.h file. Clean your code again. Now everything will work like a charm If you receive again error about the "ProductModuleName-Swift.h", now create again in appDelegate.h file and clean your code again.

每次你收到这个错误的时候都要做这个工作(从appDelegate.h文件中删除并创建“ProductModuleName-Swift.h”，然后清理你的代码)来静音它。

现在它起作用了。

项目必须具有不包括空格的产品模块名称。 “定义模块”必须在“生成设置”中的“打包”下设置为“是”。

最后的作品。感谢大家的帮助:-)

这个答案解决了你可能已经有一些Objective-C代码调用Swift类，然后你开始收到这个错误的用例。

如何解决问题

接下来的步骤最终为我解决了所有问题。我在上面读到有人提到“鸡和蛋”，正是这个概念让我想到了这个过程。这个显式的过程表明，在生成头文件之前，必须删除任何引用Swift类的Objective-C代码。

Comment out the #import "ProductModuleName-Swift.h" statement in your Objective-C implementation file Comment out any references in the Objective-C implementation file to Swift Classes Clean & Build Resolve all errors/warnings Remove the comment on the #import "ProductModuleName-Swift.h" statement Clean & build (successfully or fix any remaining errors, verify that you are not referencing any Swift classes in Objective-C at this point. If so temporarily comment these out) Verify that "ProductModuleName-Swift.h" is generated by Cmd-Clicking on the class name of the #import "ProductModuleName-Swift.h" statement Remove the comment on the code referencing Swift classes in the Objective-C implementation file. Clean & Build as normal (the "ProductModuleName-Swift.h" should be generated and your Objective-C code referencing Swift Classes can be used as normal)

注意:在执行此过程时，关于将空格更改为下划线和将定义模块更改为YES的答案仍然适用，正如Apple文档中指定的规则一样。

桥接头路径

在一个错误中，在构建过程中没有找到文件ProductModuleName-Bridging-Header.h。这一事实产生了一个错误

< unknown>:0:错误:桥接头 “/Users/Shared/Working/abc/abc- bridging - header .h”不存在

对错误的进一步检查表明，该文件永远不会存在于所描述的位置，因为它实际上位于(错误的路径)

' /用户/共享/工作/ abc / abc / abc-Bridging-Header.h’。快速搜索目标/项目构建设置，手动进行更正，abc-Swift.h文件再次自动生成。

你必须在Objective-C类中导入一个头文件，它是:

#import “ProductModuleName-Swift.h”

它是自动生成的，在引用中它说:“目标中的任何Swift文件都将在包含此import语句的Objective-C .m文件中可见。”

I had similar problem but my project was compiling before and suddenly got error after few files code change. It took me while to figure out why I am getting 'File not found' error for myproject-swift.h file. The code changes I had done had some errors. Xcode did not point put those error instead all time showing the 'File not found error'. Then got copy of previous version code and I compared with new code and merged file one by one. After each file merge complied the project to find the error. So bottom line is if you have error in your code Xcode may just display 'file not found error' for myproject-swift.h file. Most likely you have compilation error in your project. Clean those error and it will work.