Скачать или смотреть How to Properly Create and Check for Directories in Swift FileManager

Discover how to efficiently manage directories in Swift using FileManager, and avoid common pitfalls.
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This video is based on the question https://stackoverflow.com/q/72899751/ asked by the user 'martin wotterman' ( https://stackoverflow.com/u/19249293/ ) and on the answer https://stackoverflow.com/a/72900261/ provided by the user 'vadian' ( https://stackoverflow.com/u/5044042/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Managing Directories with Swift's FileManager

When developing applications in Swift, managing directories can sometimes seem like a straightforward task, but developers often encounter unexpected issues. One common problem is creating and checking for the existence of directories in the FileManager. If you're finding that the folders you expect to exist are always reported as absent, this article will guide you through the solution.

The Problem

You may want to create a directory in your app's FileManager root path. Before creating this directory, you need to check if it already exists. However, when you check for its existence, you find that it always returns false, resulting in the function attempting to create a new directory each time the app starts.

For example, when printing the root URL, you notice that the URL hash in the middle changes on each run, indicating you’re checking against a path that varies with each session, instead of the consistent path you intended.

Here's an example of the URLs you're seeing:

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The Solution

The issue lies in how you are getting the file path and checking for directory existence. Specifically, you are incorrectly using absoluteString which includes the "file://" scheme in the path. Instead, you should be using the path property of the URL for checking file system paths.

Checking Directory Existence

A better approach would be to use the URL-related API directly to check if a directory exists. Here's how to implement this correctly.

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Creating a New Directory

Next, when creating a new directory, make sure you also reference the proper path format using the path property.

Here’s a refined version of your createARObjectDirectory method:

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Refined Directory Creation Function

Additionally, here’s how you should write the createNewDirectory function for improved clarity and efficiency:

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Conclusion

In summary, when working with directories in Swift's FileManager, always use the path property of URLs for file system operations. By implementing proper checking and directory creation methods, you can avoid common pitfalls and streamline your application’s file management processes. With these adjustments, you should see consistent results when checking for existing directories and creating new ones. Happy coding!