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Create Stunning SwiftUI Concentric Circles to Show Progress Gradually

Learn how to implement concentric circles in `SwiftUI` that fill gradually to display user progress in a game effectively. --- This video is based on the question https://stackoverflow.com/q/77592902/ asked by the user 'minaa9' ( https://stackoverflow.com/u/22948465/ ) and on the answer https://stackoverflow.com/a/77593159/ provided by the user 'workingdog support Ukraine' ( https://stackoverflow.com/u/11969817/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, comments, revision history etc. For example, the original title of the Question was: SwiftUI concentric circles that show progress by gradually appearing Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Create Stunning SwiftUI Concentric Circles to Show Progress Gradually When developing a game, visually representing user progress can greatly enhance user experience and engagement. A fantastic way to illustrate this is through concentric circles, which dynamically fill as players achieve milestones. In this guide, we're going to tackle a specific problem: how to create concentric circles in SwiftUI that fill gradually as a user collects points in a game with three levels. Let's dive into this engaging challenge! The Problem Imagine your game has three levels, each requiring players to collect five points for a total of 15 points. You want to use three circles, each representing a level, that start empty and only fill as players earn points. However, your initial code seems to have circles that start off filled, which isn’t the desired effect. [[See Video to Reveal this Text or Code Snippet]] The goal is to have the circles gradually fill one-fifth at a time as points are collected. So, how can we achieve this visually appealing effect? Solution Overview By modifying your SwiftUI implementation, you can create concentric circles that initially appear empty and gradually fill up based on user interaction. Here's how to do it step-by-step: Step 1: Create Circles with Outline Make sure that your circles start with an outline that is faint, indicating they are empty. You can do that by adjusting the opacity of the stroke color used for the circles, like so: [[See Video to Reveal this Text or Code Snippet]] This will give the illusion that the circles are not filled initially. Step 2: Set Up the Progress States As you've already done, create state variables to maintain the progress of each level. Ensure that these start at 0.0 when your view appears. This is crucial as it determines the fill of your circles. [[See Video to Reveal this Text or Code Snippet]] Step 3: Update the Circle Views You can now update your ZStack to include the modified circle structures. Use the opacity trick on the outer rings while ensuring that the inner trimmable circles reflect the progress correctly: [[See Video to Reveal this Text or Code Snippet]] Step 4: Animate Progress Updates Finally, create a button that, when pressed, updates the progress for each circle gradually filling the segments: [[See Video to Reveal this Text or Code Snippet]] Step 5: Run Your Code Here’s the complete code reflecting all the steps discussed: [[See Video to Reveal this Text or Code Snippet]] Conclusion By following these steps, you've now created a beautiful and functional set of concentric circles in SwiftUI that gradually fill to indicate progress in your game. This technique not only enhances visual feedback but also motivates players as they can see their progress clearly. Experiment with different colors and animations to customize the experience further. Happy coding!