Swift项目中的链接框架和库 [英] Linked frameworks and libraries in Swift project

问题描述

我的iOS应用以 AVPlayer 播放声音。要做到这一点，我必须在类的顶部键入以下内容：

My iOS app plays sounds with AVPlayer. To do this I had to type following on the top of a class:

import AVFoundation

我来自Objective-C背景，所以我去了Xcode项目的 General 标签并添加了 AVFoundation 点击链接框架和库下的加号按钮。黄色工具箱出现在我的项目中。我是否必须这样做？

I came from Objective-C background, so I went to Xcode project's General tab and added AVFoundation there by clicking on plus button under the Linked frameworks and libraries. Yellow toolbox appeared in my project. Do I have to do this?

我试图将它从项目中移除 - 无论是从侧边栏还是在Xcode偏好设置中，我的应用程序仍然可以正常播放。那么 import 为你处理一切吗？

I tried to remove it from the project — both from the sidebar and in Xcode preferences, my app still works and sounds are playing. So does import handling everything for you?

推荐答案

是的，<$ Swift中的c $ c> import 与Objective-C中的 @import 基本相同（而不是 #import < ...> ），导入模块。

Yes, import in Swift is basically the same as @import in Objective-C (as opposed to #import <…>), which import modules.

最近推出了这个新功能（模块）（ 1 - 2年前？）和确实为您导入框架而无需将应用程序与其明确链接：使用模块时（ @import 在ObjC中，导入在Swift中），编译器将看到模块名称，并为您隐式和自动地链接您的应用程序框架。

This new feature (modules) was introduced recently (1-2 years ago?) and does import the framework for you without the need to explicitly link you app with it: when using modules (@import in ObjC, import in Swift), the compiler will see the module name and link your app with the framework implicitly and automagically for you.

这是我们在 #import 是唯一选项时我们没有回来的新功能，我们必须自己手动添加系统框架。

So that's a new feature we didn't have back in the day when #import were the only option and we had to manually add system frameworks ourselves.

（请注意，模块仅适用于Apple的框架，直到iOS8到货。但现在您可以构建您的o了在为iOS8构建动态框架时，它们也可用于第三方框架，只要它们具有 module.map ）

如果您有兴趣，可以阅读更多在Clang文档本身。各种博客文章也谈论这个主题（例如，首先谷歌的结果是这篇博文）

If you're interested, you can read more in the Clang documentation itself. Various blog posts also talk about the subject (e.g. first Google result is this blog post)

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