How to Get the Default Header Height in React Navigation 6 Using getDefaultHeaderHeight

Discover how to retrieve the default header height in React Navigation 6, even when using a custom header component. This guide covers solutions and provides code snippets for an effective implementation.
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This video is based on the question https://stackoverflow.com/q/68820636/ asked by the user 'Raul' ( https://stackoverflow.com/u/13943651/ ) and on the answer https://stackoverflow.com/a/68820988/ provided by the user 'satya164' ( https://stackoverflow.com/u/1665026/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding Custom Header Heights in React Navigation 6

When developing an application using React Navigation 6, you may come across the need to create a custom header component. While building this custom header, you might want to determine its height to ensure that elements are correctly positioned and styled. However, if you're rendering your header without the built-in navigation headers, you might find yourself facing a puzzling situation: the height returns 0. This is a common problem, particularly when utilizing navigation stack options like headerShown: false. So, how do we solve it?

In this guide, we will explore how to retrieve the default header height in React Navigation 6 and use it effectively with our custom headers. Let's break down the solution step by step.

The Problem

In a typical setup, you might create a custom header component like this:

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

You might be attempting to determine the headerHeight using the useHeaderHeight hook:

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

But this returns 0 because you've hidden the default header by setting:

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

This setup can be quite frustrating, especially when you're trying to style your custom components.

The Solution

Using getDefaultHeaderHeight

To resolve this issue, we can leverage the getDefaultHeaderHeight function. This function allows us to retrieve the default height of a header provided by React Navigation, even when the default header is not displayed. Let’s see how to implement it:

Step 1: Import Necessary Functions

First, make sure to import getDefaultHeaderHeight from @ react-navigation/elements and the utilities for safe area insets:

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

Step 2: Implement the Header Component

Now, inside your component, use these functions to get the header height. This allows you to correctly size your custom header:

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

Explanation of the Code

useSafeAreaFrame: This hook retrieves the dimensions of the screen, including any safe area insets.

useSafeAreaInsets: It provides the padding needed for safe areas, which is particularly useful for devices with notches or rounded corners.

getDefaultHeaderHeight: This function calculates the height of the default header when passed the frame dimensions and the insets.

Advantages of This Approach

Dynamic Height: By calculating the header height based on device dimensions and safe areas, your custom header will look good across all devices.

Simple Integration: This approach integrates seamlessly with existing React Navigation setups, allowing you to maintain consistency in your UI.

Conclusion

Creating a custom header in React Navigation 6 doesn't have to be a daunting task. By utilizing the getDefaultHeaderHeight function, you can obtain the correct header height even when you're not displaying the default navigation headers. This makes it easier to position and style your custom components effectively.

Now you can enjoy more flexibility in designing your application's header without sacrificing layout accuracy! Happy coding!

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