swift - "public"在 Swift 中是什么意思？

Question

我理解 internal 意味着该属性只能被 Swift 代码访问，而 private 意味着该属性只能被该文件访问，但不public 基本上与 internal 意思相同吗？除了 Swift 脚本之外还有什么想要访问该属性？

Answer 1

Public access enables entities to be used within any source file from their defining module, and also in a source file from another module that imports the defining module. You typically use public access when specifying the public interface to a framework.

Internal access enables entities to be used within any source file from their defining module, but not in any source file outside of that module. You typically use internal access when defining an app’s or a framework’s internal structure.

Private access restricts the use of an entity to its own defining source file. Use private access to hide the implementation details of a specific piece of functionality.

https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/AccessControl.html