Swift到Objective-C标头不包含Swift类 [英] Swift to Objective-C header does not contain Swift classes

问题描述

我正在尝试在我的Objective-C代码中使用Swift类，但是我的Swift类似乎没有出现在生成的标头中.结果，我的构建失败，并显示使用未声明的标识符'HelloWorld'".

I'm attempting to use Swift classes in my Objective-C code, however my Swift classes don't seem to appear in the generated header. As a result, my build fails with "Use of undeclared identifier 'HelloWorld'".

我使用模板创建了一个名为TestApp的项目.

I used the templates to create a project called TestApp.

我的目标中具有以下构建设置:

I have the following Build Settings in my target:

• 产品名称:TestApp
• 产品模块名称:TestAppModule
• 定义模块:是

Apple的文档说要使用#import <TestApp/TestAppModule-Swift.h>，但这是行不通的.

Apple's documentation says to use #import <TestApp/TestAppModule-Swift.h> but this doesn't work.

相反，我在我的".m"文件中使用了#import "TestAppModule-Swift.h".似乎找到了.

Instead, I'm using #import "TestAppModule-Swift.h" in my ".m" file. It seems to find this.

我能够导航到它，看起来像这样...

I'm able to navigate to it, and it looks like this...

// Generated by Swift version 1.0 (swift-600.0.34.4.5)

#if defined(__has_include) && __has_include(<swift/objc-prologue.h>)
# include <swift/objc-prologue.h>
#endif

...etc...

但其中未定义任何类.

我在项目中有一个Swift文件，看起来像这样...

I have a Swift file in the project that looks like this...

class HelloWorld {    
    func hello() {
        println("hello world")
    }
}

为什么使用标准头文件位置#import <TestApp/TestAppModule-Swift.h>不能正常工作?

Why isn't this working using the standard header file location #import <TestApp/TestAppModule-Swift.h>?

如何在该头文件中获取快捷类，因此不会出现未声明的标识符"错误?

How can I get my swift classes in that header file, so I won't get the "undeclared identifier" error?

推荐答案

这就是我如何使其工作的方式.您可以在此处找到更大规模的答案.

Here's how I have gotten it to work. You can see a more large-scale answer here.

更改此:

class HelloWorld {    
    func hello() {
        println("hello world")
    }
}

收件人:

@objc class HelloWorld { 

    class func newInstance() -> HelloWorld {
        return HelloWorld()
    }

    func hello() {
        println("hello world")
    }
}

然后，在您的ObjC文件中:

Then, In your ObjC file:

#import "TestApp-Swift.h"

然后这样呼叫:

HelloWorld * helloWorld = [HelloWorld newInstance];
[helloWorld hello];

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