Скачать или смотреть Fixing the Matched Geometry Effect in SwiftUI

Learn how to resolve issues with the `Matched Geometry Effect` in SwiftUI by following our step-by-step guide. Improve your animation implementations today!
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This video is based on the question https://stackoverflow.com/q/71652672/ asked by the user 'green8' ( https://stackoverflow.com/u/14480820/ ) and on the answer https://stackoverflow.com/a/71657078/ provided by the user 'Asperi' ( https://stackoverflow.com/u/12299030/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the Matched Geometry Effect in SwiftUI: A Step-by-Step Guide

Creating smooth animations in your iOS applications is crucial for providing a seamless user experience. One commonly used feature for this purpose is the Matched Geometry Effect in SwiftUI, which helps transition views smoothly. However, developers often encounter issues while implementing this feature. In this guide, we will explore a common problem with the Matched Geometry Effect and provide a detailed guide on how to solve it.

Identifying the Problem

In a recent inquiry, a developer expressed frustration that their Matched Geometry Effect was not working as expected when attempting to match two rectangles embedded in different views. Here's a simplified version of their setup:

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

Overview of Views

The developer created two views TestView1 and TestView2, each with a rectangle that needed to transition smoothly from one view to another:

TestView1: A larger rectangle on a gray background.

TestView2: A smaller rectangle on a green background.

Expected Outcome

When tapping on the rectangles, the developer expected the smaller rectangle in TestView2 to animate and expand to the size of the larger rectangle in TestView1. However, this effect didn’t happen as intended.

Solution: Applying Position Properties

To ensure the Matched Geometry Effect functions correctly, we need to specify certain properties. The most important fix involves adding the properties parameter to the matchedGeometryEffect. Below, we’ll demonstrate how to implement this in our views.

Step 1: Adjusting Matched Geometry Effect Properties

In both of your views, adjust the matchedGeometryEffect to include the properties modifier. Here’s how it should look:

For TestView1

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

This addition indicates that we want to animate not just the view's frame but also its position during the transition.

For TestView2

You can keep the current structure, but make sure to also adjust the geometry effect here if needed:

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

This ensures that both views properly communicate their geometry to the Matched Geometry Effect, allowing for a coherent animation.

Step 2: Changing the Order of Modifiers (Optional)

Alternatively, if you want to explore a different effect, you can change the order of modifiers in your view. Here’s an example:

For TestView1

Instead of declaring the frame first, define the matchedGeometryEffect before the frame modifier:

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

Final Notes on Testing

These adjustments have been successfully tested with Xcode 13.2 and iOS 15.2, ensuring compatibility with your applications running on the latest versions. Remember to always test any animations on the device, as simulator performance may not reflect actual device behavior accurately.

Conclusion

The Matched Geometry Effect can enhance your SwiftUI applications significantly by creating smooth transitions between views. If you encounter issues with view matching, remember to specify the mesh properties and be mindful of the order of modifiers. With these tips in mind, you can improve the animation experience in your applications. Happy coding!