我来了，swift
简介
通过access modifier控制代码的访问权限，用来隐藏一些不必要的实现细节
所有modifier
| Controls | Description |
|---|---|
| public | declarations are accessible from everywhere |
| private | declarations are accessible only within the defined class or struct |
| fileprivate | declarations are accessible only within the current swift file |
| internal | declarations are accessible only within the defined module (default) |
适用范围
适用于各个类型（class/struct/enum/func/property/initializers/subscripts）
如何适用
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