Скачать или смотреть Understanding Why Your React Native Animations Might Not Work

Learn why your React Native animations may not be functioning properly and how to troubleshoot them effectively.
---
This video is based on the question https://stackoverflow.com/q/64183007/ asked by the user 'iNemesis' ( https://stackoverflow.com/u/9211414/ ) and on the answer https://stackoverflow.com/a/64184169/ provided by the user 'wcandillon' ( https://stackoverflow.com/u/457056/ ) 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: React native animations are not animated

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.
---
Understanding Why Your React Native Animations Might Not Work

If you're new to React Native and have begun experimenting with animations, you may encounter some challenges that can confuse you. One common problem that developers face is when the animations fail to run entirely. This guide will help you troubleshoot your React Native animations, specifically when using the libraries react-native-reanimated and react-native-gesture-handler.

The Problem

You might be in a similar situation as many developers: you have installed the required packages and written your animation code, but nothing seems to happen. For example, let's consider the following scenario:

You've created a new Expo app.

You've installed react-native-reanimated (version ~1.13.0) and react-native-gesture-handler (version ~1.7.0).

Your code looks logically correct, but you're not seeing any animations when you interact with the elements.

Here’s the code snippet that might describe your current implementation:

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

The Solution

Assignment of the Event Handler

The issue often stems from how the event handler is set up in your code. Instead of using Animated.event directly within the onGestureEvent prop, it's recommended to pass the event to a variable beforehand. This allows you to manage different aspects of the gesture.

Here’s how you can refactor your code:

Step 1: Create an Event Handler

You should create an event handler function that properly captures the gesture events. This function can be reused for both gesture events and state changes. Here’s how to do it:

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

Step 2: Apply the Event Handler

Next, assign the eventHandler to the onGestureEvent as well as the onHandlerStateChange prop. Here’s the updated section of your PanGestureHandler:

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

With these changes, your updated PanGestureHandler section will look like this:

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

Final Code

Here’s how your entire component might look after applying these changes:

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

Conclusion

By ensuring that you assign the animated event handler properly, your React Native animations should work seamlessly. With these adjustments, you can observe how interactive gestures manipulate the animated components in your app.

If you're still having trouble, double-check that you've installed the correct versions of the libraries and consult the official documentation for additional guidance.

Keep experimenting with React Native animations, and enjoy building beautiful and dynamic applications!