Скачать или смотреть Displaying Firestore Data in SwiftUI: Troubleshooting Tips for Beginners

Learn how to troubleshoot data not displaying in your SwiftUI application connected to Firestore. Effective tips for beginners to fix common issues!
---
This video is based on the question https://stackoverflow.com/q/76649020/ asked by the user 'Jacob Miller' ( https://stackoverflow.com/u/16048603/ ) and on the answer https://stackoverflow.com/a/76649258/ provided by the user 'jnpdx' ( https://stackoverflow.com/u/560942/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: SwiftUI Firestore Data Isn't Getting Displayed

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Displaying Firestore Data in SwiftUI: Troubleshooting Tips for Beginners

When you're diving into the world of SwiftUI and Firestore, it's not uncommon to encounter a situation where your data isn't displaying as expected. For many beginners, it can be quite frustrating to see an empty list when you've done everything you thought right. In this guide, we will discuss a specific problem: SwiftUI Firestore Data Isn't Getting Displayed, and provide a step-by-step solution to ensure your data appears correctly in your app.

Understanding the Problem

In the provided code, the user is correctly fetching data from Firestore but is experiencing an empty list in their SwiftUI component. They confirm that the data is being fetched successfully, as they can see the name being printed to the console; however, they can't see the list of devices in the UI.

The Code Breakdown

To understand where the problem lies, let's look at the relevant parts of the code provided by the user:

FirestoreManager: This class is responsible for fetching the data from Firestore and publishing it to update the UI.

Device Model: The Device structure defines how the data should be represented.

HomeView: This view is where the data is displayed.

Identifying the Issues

After analyzing the user’s code, two main issues were identified that are causing the empty list:

Using the Wrong Property Wrapper: The @ StateObject instead of @ ObservedObject should be used when the ObservableObject is owned within this view.

Incompatible UI Structure: The List should not be placed inside a ScrollView. Both List and ScrollView are designed to handle scrolling, which can lead to unexpected behavior.

Proposed Solutions

1. Switch from @ ObservedObject to @ StateObject

Change the declaration of firestoreManager in HomeView from @ StateObject to @ ObservedObject (if it’s instantiated elsewhere) or ensure it's declared correctly as a @ StateObject:

[[See Video to Reveal this Text or Code Snippet]]

If it is already being initialized within the HomeView, using @ StateObject is correct.

2. Removing ScrollView

Eliminate the ScrollView and let the List manage its own scrolling. Update the body of HomeView to look like this:

[[See Video to Reveal this Text or Code Snippet]]

3. Ensure Data is Fetched Correctly

Verify that the fetchAllDevicesForUser method is successfully called and the data is being assigned to devices. Print debug logs if necessary to ensure data fetching is working as expected.

Conclusion

By implementing these changes, you should be able to resolve the issue with your Firestore data not displaying in your SwiftUI app. Remember, debugging comes with practice, and making small adjustments can lead to better app performance and usability. If you face any more challenges while coding in SwiftUI, don’t hesitate to reach out to the community or refer to official documentation.

Happy coding, and may your applications shine with beautiful user interfaces!