Скачать или смотреть How to Draw Shapes with SwiftUI on macOS

Learn how to effectively use SwiftUI and CALayer to draw shapes such as rounded rectangles in a macOS environment. This guide provides a step-by-step solution to a common problem faced by developers.
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This video is based on the question https://stackoverflow.com/q/66883542/ asked by the user 'pistacchio' ( https://stackoverflow.com/u/42636/ ) and on the answer https://stackoverflow.com/a/66884277/ provided by the user 'Howlium' ( https://stackoverflow.com/u/8351643/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Draw Shapes with SwiftUI on macOS

Creating beautiful and dynamic graphics in macOS applications can elevate user experience significantly. If you’ve ever tried to draw custom shapes like rounded rectangles using SwiftUI, you might hit a few snags. Let’s tackle the common challenge of drawing a rounded rectangle with CALayer and CAShapeLayer in a macOS environment, ensuring you make the best use of SwiftUI’s capabilities.

Problem Summary

You are attempting to draw a rounded rectangle using CALayer and CAShapeLayer. You start with the following code snippet, but it doesn’t seem to work as expected. The goal is to create a view that is 100x100 pixels with a rounded rectangle measuring 50x50 pixels.

Existing Code Issue

Here is the code you’re working with:

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

Key Problems

Drawing Code Location: The drawing code is placed in the makeNSView method, where it’s not executed as expected.

Layer Configuration: The CAShapeLayer is not being properly populated or configured with the path you've created.

Proposed Solution

To rectify these issues, you need to move your shape drawing code into the draw method of the NSView subclass. By doing so, you ensure that it executes correctly during the drawing cycle of the view.

Revised Code Structure

Create a Custom NSView: Instead of drawing directly in the NSViewRepresentable, create a custom NSView class to handle the drawing.

Override the Draw Method: Move the drawing logic into the draw method of this custom view.

Here’s a Revised Code Example:

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

Explanation:

CustomView Class: By creating a separate CustomView class, you encapsulate your drawing logic.

draw Method: This method is called whenever the view needs to be repainted, making it the perfect place for your shape drawing code.

Coordinate Adjustment: Adjust the coordinates in your NSBezierPath to center it within your 100x100 view.

Conclusion

With this refined structure, you can effectively and reliably draw shapes using SwiftUI within a macOS environment. By placing your drawing logic in the correct lifecycle method, you ensure everything renders smoothly and correctly. Don’t hesitate to customize the colors and shapes further to suit your design’s needs!

Happy coding!