私人变量可以从班级外部访问 [英] Private var is accessible from outside the class

问题描述

这是在Playground中完成的，只是为了简化.

This was done in Playground, just to simplify.

class MyPrivateVar
{
    private var priv: String?
}

var myInstance = MyPrivateVar()

myInstance.priv = "Something"

没有编译器警告.实际上，自动完成显示priv没有问题. 我的理解是，在类{}的范围之外，我不应该看到私有的任何内容，func或var.

No compiler warning. In fact auto-complete is showing priv without a problem. My understanding is that outside the boundaries of {} of the class, I'm not supposed to be able to see a private anything, func nor var.

我想念什么吗?

推荐答案

Swift中的访问修饰符与其他语言的实现方式不同.共有三个级别:

Access modifiers in Swift are implemented differently than other languages. There are three levels:

private:仅在该特定文件内

internal:仅在模块(项目)中可访问

internal: accessible only within the module (project)

public:可从任何地方访问

除非另有标记，否则默认情况下，您编写的所有内容均为internal.

Unless marked otherwise, everything you write is internal by default.

Swift博客发布了有关访问控制的帖子.在Beta 4中进行了介绍，并且

The Swift blog had a post about access control when the features were introduced in beta 4, and Apple's documentation has a chapter as well.

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