原文：https://www.raywenderlich.com/126365/ios-frameworks-tutorial

frameworks 的三个主要作用

• 代码封闭
• 代码模块化
• 代码复用

开始

下载 starter project

创建 Framework

1. Xcode -> new -> Project -> iOS Framework & Library-> Cocoa Touch Framework.
2. 填写相应的 Product Name, Organization Name等。

3. 拖入相关的Code及资源文件。

   
   
   
4. 添加到工程项目中（可选）

5. 添加frameworks 到 Embedded Binaries中

   
   
   

Access Control(访问控制)

Swift有三种访问控制：

• Public: for code called by the app or other frameworks, e.g., a custom view.
• Internal: for code used between functions and classes within the framework, e.g., custom layers in that view.
• Private: for code used within a single file, e.g., a helper function that computer layout height.

Update the Storyboard

In the Identity Inspector, under Custom Class, change the Module to ThreeRingControl.