存取控制最重要的兩個分野為 module 和 source file：
module：一個 bundle ID 下的 app 或一個 framework。
source file：就是每一個 .swift 檔案。
分 5 個層級，最高到最低依次為：
open / public / internal / file-private / private
The only reason you would use fileprivate is when you want to access your code within the same file from different classes or structs. 👉 SwfitLee
// fileprivate setter fileprivate(set) var a = 1
extensions have to be defined within the same file, private declarations are not visible outside the file.
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private
fileprivate
Last updated 3 years ago
