我还想补充一点:

我非常感谢@Logan的回答。创建桥文件和设置有很大帮助。

但是在做了所有这些步骤之后，我仍然没有在Swift中获得Objective-C类。

我使用cocoapods库并将其集成到我的项目中。也就是豆荚"pop"。

因此，如果你在Swift中使用Objective-C pod，那么可能有一个机会，你不能获得或导入类到Swift中。

你要做的一件简单的事情是:

转到<YOUR-PROJECT>-Bridging-Header文件和 将语句#import <ObjC_Framework>替换为@import ObjC_Framework

例如:(Pop library)

取代

#import <pop/POP.h>

with

@import pop;

当#import无效时使用clang import。

使用objective-c的双向方法

1

在Xcode Project中创建bridge-header.h文件 在bridge-Header文件中导入.h文件 在Build设置中设置bridge-Header的路径。 清理项目

2

在项目中创建objective-c文件(它会自动在Build Settings中为您设置路径) 在bridge-Header文件中导入.h文件

现在可以开始了 谢谢

创建桥接头后，进入构建设置=>搜索“Objective-C桥接头”。

就在下面你会发现“Objective-C Generated Interface Header Name”文件。

在视图控制器中导入那个文件。

例子:在我的例子中:“Dauble-Swift.h”

以下是在Swift项目中使用Objective-C代码(在这种情况下，由第三方提供的框架)的逐步说明:

通过选择file -> New -> New file -> Objective-C file将任何Objective-C文件添加到Swift项目中。保存时，Xcode会询问你是否想要添加一个桥接头。选择“是”。 (来源:derrrick.com)

步骤简单:

A prompt appears, and then click on OK... If it does not appear, then we create it manually like in the following... Create one header file from iOS source and give the name ProjectName-Bridging-Header (example: Test-Bridging-Header), and then go to build setting in the Swift compiler code -> Objective-C bridge add Objective-C bridge name ..(Test/Test-Bridging-Header.h). Yeah, that's complete. Optionally, delete the Objective-C file you added (named "anything" in the GIF image above). You don't need it any more. Open the bridging header file -- the filename is of the form [YourProject]-Bridging-Header.h. It includes an Xcode-provided comment. Add a line of code for the Objective-C file you want to include, such as a third-party framework. For example, to add Mixpanel to your project, you will need to add the following line of code to the bridging header file: #import "Mixpanel.h" Now in any Swift file you can use existing Objective-C code, in the Swift syntax (in the case of this example, and you can call Mixpanel SDK methods, etc.). You need to familiarize yourself with how Xcode translates Objective-C to Swift. Apple's guide is a quick read. Or see this answer for an incomplete summary.

Mixpanel的示例:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    Mixpanel.sharedInstanceWithToken("your-token")
    return true
}

就是这样!

注意:如果你从你的项目中删除桥接头文件，请确保进入构建设置并在“Swift Compiler - Code Generation”下删除“Objective-C桥接头”的值。

给那些试图将Objective-C库添加到Swift的人一个提示:你应该在构建设置中添加- objc ->链接->其他链接器标志。

引用自文档:

Any Objective-C framework (or C library) that’s accessible as a module can be imported directly into Swift. This includes all of the Objective-C system frameworks—such as Foundation, UIKit, and SpriteKit—as well as common C libraries supplied with the system. For example, to import Foundation, simply add this import statement to the top of the Swift file you’re working in: import Foundation This import makes all of the Foundation APIs—including NSDate, NSURL, NSMutableData, and all of their methods, properties, and categories—directly available in Swift.