Скачать или смотреть Resolving Custom Fonts Loading Issues in React Native Expo with Google Fonts

A comprehensive guide on how to successfully load `custom fonts` alongside `Google Fonts` in your React Native Expo application, ensuring a seamless user experience.
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This video is based on the question https://stackoverflow.com/q/73020383/ asked by the user 'Hafiz Muhammad Bilal' ( https://stackoverflow.com/u/14871242/ ) and on the answer https://stackoverflow.com/a/73030391/ provided by the user 'chunghn' ( https://stackoverflow.com/u/19491379/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Issue: Custom Fonts Not Loading in React Native Expo

If you're working with React Native Expo, you may have encountered a frustrating issue while trying to load custom fonts alongside Google Fonts. This problem can halt your development workflow and leave you scrambling to figure out where things went wrong. If you've received an error message similar to the following:

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

it indicates that your application is struggling to find the specified font file. In this guide, we’ll break down the potential reasons for this error and provide a step-by-step guide to resolve it.

Analyzing the Code

Let's take a close look at the provided code snippets to understand where things may be going awry.

The Main Application Code (App.js)

The main application code is responsible for loading the fonts using Font.loadAsync(). Here’s the relevant snippet:

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

The Custom Fonts Loader (useFonts.js)

The useFonts.js file appears to be where you're attempting to load your custom font:

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

Common Issues to Check

File Path Accuracy
The path to your font file must be correct. In the above code, check that the file structure actually includes the specified path. If your directory doesn't contain the file at ../../assets/fonts/sf-ui-text/SFUIText-Bold.ttf, you will encounter the error mentioned earlier.

Tip: Ensure that the directory structure exactly matches your import statement.

File Existence
Verify that the font file itself exists at the location indicated. Sometimes files may not have been downloaded, or their names may be incorrect.

Loading Mechanism
The use of the useFonts() hook is a good practice, as it allows for a more organized font loading experience. In case you want better handling of font loading, consider creating a customized useFonts hook that can better suit your application's needs.

A Recommended Solution

To rectify the issues you’re encountering with loading custom fonts in your React Native Expo project, follow these simple steps:

Check the File Path
Make sure the path to the TTF file is accurate. You can do this by navigating to the file manually or using terminal commands to confirm its existence.

Confirm the Font's Availability
Make sure that SFUIText-Bold.ttf exists in your assets folder. If it's missing, ensure you've added the font file correctly.

Adjust the Code if Necessary
If you're confident about the file's path and it still isn’t working, try to directly use the Font.loadAsync() in your App.js to directly load the font without relying on an external useFonts function as a temporary measure.

Utilize Expo's Font Hooks
Consider utilizing Expo's built-in hooks or further simplifying your font loading mechanism as necessary.

Conclusion

By following these suggestions, you should be able to effectively troubleshoot and solve the problem of custom fonts not loading alongside Google Fonts in your React Native Expo application. As every developer knows, debugging can often be a daunting task; however, with a careful eye on the file paths and proper loading techniques, you can ensure a smoother development experience.

Remember, if ever in doubt about a file, checking its existence and its path is always a good first step! Happy coding!