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This article mainly introduces "what is the difference between fileprivate and private in Swift5". In daily operation, I believe that many people have doubts about the difference between fileprivate and private in Swift5. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the question of "what is the difference between fileprivate and private in Swift5?" Next, please follow the editor to study!

Preface

Fileprivate and private are part of the access control modifiers in Swift. These keywords, along with internal,public and open, allow you to restrict access to code in other source files and modules.

Private access levels are the lowest and most stringent, while open access is the highest and least restricted. Swift's documentation will explain all access levels in detail, but in this article, I will explain the differences between two close friends: fileprivate and private.

Open access is the highest (least restrictive) access level, while private access is the lowest (most restrictive) access level. This will improve readability and make it easier for others to use and understand your code.

When to use fileprivate

Although the keywords are almost the same, there are significant differences in their use cases. Fileprivate access restricts the use of entities in the same defined source file. The only reason to use fileprivate is that you want to access the code in the current file in different classes or structures in the current file. These classes, structures are all in one file. In the following example, we have an ImageProvider and an ImageViewController. We can use fileprivate if they are defined in the same file and we want to allow access to imageView in ImageProvider.

However, if we were to create a separate file for the ImageProvider structure, we would get a compiler error:

ImageView cannot be accessed due to fileprivate

In my opinion, its use scene is not large. In a good project structure, entities are usually defined in the corresponding file.

When to use private

The private keyword is used more often and restricts entities' use of closed declarations and their extensions. However, the extension must be defined in the same file. In other words, the private declaration is not visible outside the file. You can use this keyword to display only the minimum amount of code required to interact with the entity. This will improve readability and make it easier for others to use and understand your code.

Fileprivate vs private

It is best to explain the difference through the image provider example. These two access keywords are declared in the same file and will cause the following compiler errors:

Private cannot be accessed outside class, fileprivate scope is the current file

At this point, the study on "what is the difference between fileprivate and private in Swift5" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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