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Struggling to upload files to Firebase using Swift? Learn how to effectively use `UIDocumentPickerViewController` and prevent empty uploads in your iOS app.
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This video is based on the question https://stackoverflow.com/q/73808003/ asked by the user 'Muhammed Ömer Ünver' ( https://stackoverflow.com/u/19566234/ ) and on the answer https://stackoverflow.com/a/73885747/ provided by the user 'Muhammed Ömer Ünver' ( https://stackoverflow.com/u/19566234/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Properly Upload Files to Firebase with Swift

If you're developing an iOS application using Swift and working with Firebase, you might have encountered issues when trying to upload files. One common problem arises when using the UIDocumentPickerController, particularly for documents like PDFs — users have reported that they end up uploading empty files or facing permission issues when trying to access these files. In this guide, we will explore how to correctly upload documents to Firebase, ensuring that you don't run into these frustrating obstacles.

The Problem

You may find that when you use the UIDocumentPickerController, you're able to select a document for upload, but the resulting upload turns out to be empty. Furthermore, when attempting to download the files from Firebase, you might find that the files are empty. This can be particularly vexing for anyone new to Swift and Firebase.

Solution Overview

To resolve this problem, you'll need to properly configure your document selection and ensure that you're managing permissions correctly during the upload process. The solution consists of a few key steps:

Select the document correctly using UIDocumentPickerViewController.

Ensure the selected document's permissions are accessed correctly.

Upload the file data to Firebase Storage.

Store the file reference in Firestore correctly.

Let’s break down the solution step-by-step.

Step 1: Using UIDocumentPickerViewController to Select Files

When selecting files, ensure you configure the document picker correctly. Instead of limiting the document types to only PDFs, you can use a more general type to allow for various file formats.

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Step 2: Manage Permissions Correctly

Once a document is selected, it’s important to manage the permission of accessing the file. Use the startAccessingSecurityScopedResource method to gain permission before trying to read the data.

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Step 3: Upload File Data to Firebase Storage

When you're ready to upload the file, use the Data(contentsOf:) method to read the document's data. This should be done only after successfully accessing the necessary permissions.

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Step 4: Store File Reference in Firestore

After successfully uploading to Firebase Storage, don’t forget to store the file reference in Firebase Firestore. This way, you can have access to the uploaded document paths and any relevant metadata.

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Conclusion

By following these steps, you should be able to successfully upload various file types to Firebase using Swift without running into the issue of empty files. Remember to properly select and access your documents, manage permissions, and correctly handle the upload and storage processes. Happy coding!