Скачать или смотреть Basic SwiftUI Animation Using withAnimation for Smooth Overlays

Discover how to create smooth animations in SwiftUI with a simple guide to using `withAnimation` blocks over Bool values for overlays.
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This video is based on the question https://stackoverflow.com/q/76470220/ asked by the user 'Gerry Gao' ( https://stackoverflow.com/u/9293172/ ) and on the answer https://stackoverflow.com/a/76471632/ provided by the user 'VINA GAJERA' ( https://stackoverflow.com/u/22029943/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating Smooth Animations in SwiftUI Using withAnimation

In today’s guide, we are diving into a common issue SwiftUI developers face: implementing smooth animations when toggling visibility with a Boolean value. Let’s take a look at how to achieve fluid animations for overlays, specifically when showing and hiding them using the withAnimation block in SwiftUI.

The Problem

Imagine you have a SwiftUI view where you want to display an overlay when a button is tapped. This overlay should slide in smoothly, and similarly, it should slide out when another button is tapped. However, there's an issue: after dismissing the overlay and trying to bring it back again, the animation seems to disappear, causing an awkward transition. Instead of smoothly appearing, the overlay pops into view after a delay.

The Code Setup

Here’s a brief overview of the code we need to work with:

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

This code is a good starting point, but it doesn't always work as expected when toggling the overlay multiple times.

The Solution

To solve the issue of the disappearing animations, we need to make a few adjustments to our animation setup. Specifically, changing the timing curve of the animation can resolve the issue. Instead of using easeIn, we'll switch to using linear for the appearance of the overlay. Here’s the updated code:

Updated Code

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

Key Changes Explained

Changing Animation:

The main change is in the animation style for showing the overlay. We replaced easeIn with linear, which gives a consistent animation effect when appearing.

Smooth Transition:

By using a linear animation, the overlay behaves consistently on every button press, ensuring it doesn’t snap to position and avoids the delay issue we encountered previously.

Conclusion

SwiftUI makes animating views quite intuitive, but slight adjustments in animation types can have significant effects on behavior. By using withAnimation thoughtfully, you can create seamless and engaging user experiences in your applications. Now, you can freely show and hide overlays without sacrificing the sleek animations that enhance your app’s interface.

Give this approach a try and feel free to tweak the animation durations and styles as per your design needs. Happy coding!