Скачать или смотреть How to Repeat an Animation Indefinitely Using CABasicAnimation in Swift

Discover how to create a custom activity indicator in Swift that features an animation running indefinitely using `CABasicAnimation`. Learn the simple steps to achieve this effect!
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This video is based on the question https://stackoverflow.com/q/63283123/ asked by the user 'Natasha' ( https://stackoverflow.com/u/3871797/ ) and on the answer https://stackoverflow.com/a/63283249/ provided by the user 'jrturton' ( https://stackoverflow.com/u/852828/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Repeat an Animation Indefinitely Using CABasicAnimation in Swift

When creating custom UI components in Swift, such as a circular loading indicator, you may encounter the challenge of making your animations loop continuously. This is particularly important for user experience, as a loading indicator should convey that a process is ongoing until it is completed or explicitly stopped by the user. In this guide, we will discuss how to achieve an indefinitely repeating animation using CABasicAnimation in Swift.

The Problem: Limiting Animation Repeats

You might have written an animation for your circular view using CABasicAnimation, and it looks something like this:

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

While this setup creates a smooth animation from the start to the end of the stroke, you may have noticed something: by default, the animation only plays for a specified number of times. If you set the repeatCount like so:

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

The animation will only execute three times before stopping. This is not ideal for a loading indicator, as we want the animation to run indefinitely until the user decides to stop it. So, the question becomes, how can you ensure that your animation continues repetitively?

The Solution: Setting the Repeat Count

Luckily, there is a straightforward solution to this problem. By using the repeatCount property of CABasicAnimation, you can make the animation effectively loop forever. To achieve this, you can use the special constant .greatestFiniteMagnitude. This constant tells the animation to repeat for as long as possible, making it suitable for scenarios like a loading indicator.

Here’s how to implement it:

Modify your animation setup as follows:

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

Complete Code Example

Here is the complete animation function with the necessary adjustments:

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

Conclusion

With just a simple change to the repeatCount property, you can ensure that your custom loading indicator's animation plays indefinitely. This technique can be applied to various animations within UIKit to enhance user feedback and engagement. Remember, a well-animated interface can significantly improve user experience, so use these animations wisely!

Now, you can create a truly captivating experience for your users with an animation that runs until stopped, giving them the assurance that processes are in progress. Happy coding!