Objective-C代码可以在Class上调用swift扩展吗? [英] Can objective-c code call swift extension on Class?

问题描述

我搜索了一些帖子，我想我不能在swift下编写扩展名，而是从Objective-C代码中调用它，对吧?

@objc之类的属性仅支持方法，类，协议?

解决方案

您可以编写一个Swift扩展并将其用于Objective-C代码.通过XCode 6.1.1进行了测试.

您需要做的只是:

• 在Swift中创建扩展(无@objc注释)

(在Objective-C类中，

• #import "ProjectTarget-Swift.h"，其中"ProjectTarget"代表Swift扩展所关联的XCode目标)

• 从Swift扩展中调用方法

更新: 就像@Rizwan Ahmed提到的那样，您需要添加@objc批注:

从Swift 4.0.3开始，如果要使用@objc批注 目标C类文件中的扩展名.

I searched some posts, I think I cannot write an extension under swift, and call it from Objective-C code, right ?

@objc like attributes only support methods, class, protocols ?

解决方案

You can write a Swift extension and use it in Objective-C code. Tested with XCode 6.1.1.

All you need to do is:

• create your extension in Swift (no @objc annotation)

• #import "ProjectTarget-Swift.h" in your Objective-C class (where "ProjectTarget" represents the XCode target the Swift extension is associated with)

• call the methods from the Swift extension

Update: As of @Rizwan Ahmed mentioned, you need to add @objc annotation:

As of Swift 4.0.3, the @objc annotation is needed if you want to use the extension in Objective C class files.

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