Скачать или смотреть How to Create a Twitter-Style Tab Bar Push Animation in Swift

Discover how to implement a `tap animation` for your tab bar icons in Swift, mimicking the popular `Twitter` app effect. Learn step-by-step to enhance your iOS application.
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This video is based on the question https://stackoverflow.com/q/62880389/ asked by the user 'coder123' ( https://stackoverflow.com/u/12628719/ ) and on the answer https://stackoverflow.com/a/62880854/ provided by the user 'thecoolwinter' ( https://stackoverflow.com/u/10453550/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Create a Twitter-Style Tab Bar Push Animation in Swift

Animations can significantly enhance the user experience in mobile applications, making them more interactive and visually appealing. One common effect seen in apps like Twitter and Spotify is the tab bar icon push animation. In this guide, we’ll explore how to implement this effect using Swift and UIKit.

Understanding the Problem

You may have found yourself wanting to make your tab bar icons respond to user taps with a push animation—not just bouncing up and down. The goal is to create an effect where the icon shrinks slightly when tapped and then returns to its normal size, giving the impression of a push.

In the initial code provided, we see a bounce animation where the icon grows before shrinking back down. However, you want a smoother transition that creates the push effect. Let’s dive into how we can achieve this.

Implementing the Push Animation

Step 1: Use UIView Animation

Instead of using CAKeyframeAnimation, we'll use UIView.animate, which provides a more straightforward way to create simple animations. Here’s how you can do it:

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

Step 2: Breakdown of the Animation Code

First Animation:

Increases the size of the icon slightly (by 5%).

Duration is set to 0.05 seconds, which makes it quick, ensuring it feels instantaneous.

The option .curveLinear ensures the scaling happens at a consistent speed.

Second Animation:

This part shrinks back the icon to its original size.

The duration is set to 0.3 seconds to create a smooth returning effect.

The usingSpringWithDamping parameter controls the "bounce"; lower values create a more pronounced bounce effect.

initialSpringVelocity impacts how fast the animation starts.

Step 3: Customize to Fit Your Needs

You can adjust the values to suit your design aesthetic. Here are some parameters you might want to experiment with:

Initial Scale: Change the scaleX and scaleY values to make the push more or less pronounced.

Animation Durations: If you want a quicker or slower transition, adjust the duration values.

Damping and Velocity: Experiment with usingSpringWithDamping and initialSpringVelocity to fine-tune how springy or snappy the animation feels.

Conclusion

Creating a engaging push animation for tab bar icons is easier than it may seem. By utilizing UIView.animate, you can achieve a smooth and interactive experience similar to popular applications like Twitter and Spotify. Remember to explore and adjust the parameters to find the perfect fit for your app’s design.

Happy coding, and may your animations impress your users!