Скачать или смотреть Mastering SwiftUI List Animations: A Guide to Dynamic Reordering

Learn how to enhance your `SwiftUI` list animations to reorder only the modified items while keeping the list static when it's first viewed.
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This video is based on the question https://stackoverflow.com/q/71356554/ asked by the user 'newdev' ( https://stackoverflow.com/u/819738/ ) and on the answer https://stackoverflow.com/a/71357011/ provided by the user 'atultw' ( https://stackoverflow.com/u/13357440/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering SwiftUI List Animations: A Guide to Dynamic Reordering

When working with lists in SwiftUI, you may often encounter a situation where you want to animate the reordering of items without disturbing the entire view. If you've tried applying animations directly to your lists, you might have noticed they tend to "float" into place, which can be distracting. This post will guide you through the solution to achieve a more refined animation effect — where only the necessary rows move to reorder as changes occur.

Understanding the Challenge

Imagine you have a list of player scores sorted from highest to lowest. When you update the scores, you want only the affected rows to animate into their new positions — not the entire list pushing back into position. This means that the initial load of the view should be static, while any subsequent adjustments should animate smoothly.

What Happens with .animation(.default)

When you apply the .animation(.default) modifier directly to your list, you notice two behaviors:

The entire list animates when the view appears, which can detract from user experience.

You may want a more controlled animation that only reacts to specific changes in your data.

Solution: Use withAnimation for Selected Updates

To achieve the desired effect, the key is to apply animation selectively— using the withAnimation function only when you change the underlying data. This allows for a targeted animation that only activates when the score updates, rather than animating the entire list on view initialization.

Step-by-step Implementation

Let’s walk through how to set this up in a simple SwiftUI application.

Define Your Model: Start by defining your player model, including a unique ID and score.

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Setup Your Content View: Create a view containing a button to shuffle scores and a list to display them.

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

Preview Your Changes: Finally, set up a preview to see your content view in action.

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

Key Takeaways

Applying .animation(.default) to the list can lead to unnecessary animations upon view appearance.

By using withAnimation selectively around the data change, only the affected items in the list will animate into their new positions.

This approach results in a more dynamic and user-friendly interface, enhancing overall user experience.

By following these steps, you can gain better control over animations in your SwiftUI applications, leading to smoother interactions and a more polished look. Happy coding!