swift-charts

Implement, review, or improve data visualizations using Swift Charts. Use when building bar, line, area, point, pie, donut, or iOS 26 3D charts; when adding chart selection, scrolling, annotations, axes, scales, legends, or foregroundStyle grouping; when plotting functions with BarPlot, LinePlot, AreaPlot, PointPlot, Chart3D, or SurfacePlot; or when creating heat maps, Gantt charts, grouped bars, sparklines, threshold lines, or spatial visualizations.

741stars40forksUpdated 6/15/2026

Developer Tools #data-visualization #ios-development #charts #swift #3d-graphics #swiftui

Security Assessment

Safe(100/100)

Security Score100/100

About swift-charts

The Swift Charts skill enables you to implement, review, and improve data visualizations using Apple's Swift Charts framework for iOS 16 and later. This skill helps you build production-ready charts including bar charts, line charts, area charts, point plots, pie charts, donut charts, and iOS 26's new 3D visualizations. It solves the challenge of creating performant, accessible, and visually appealing data representations in SwiftUI applications.

This skill covers the complete chart development lifecycle, from basic mark composition to advanced features like chart selection, scrollable regions, custom axes and scales, annotations, and legends. It supports both simple single-series visualizations and complex multi-series charts with foregroundStyle grouping. For high-performance scenarios with 1000+ data points, the skill includes guidance on vectorized plots using BarPlot, LinePlot, AreaPlot, and PointPlot. iOS 26 introduces 3D chart capabilities with Chart3D and SurfacePlot for spatial and surface data visualization.

Target users include iOS developers building dashboards, analytics applications, health and fitness apps, financial tools, or any application requiring data visualization. The skill is particularly valuable for teams working on data-intensive applications that need both performance and visual polish. It includes workflow guidance, common mistake prevention, review checklists, and references to extended patterns for accessibility, theming, heat maps, Gantt charts, sparklines, and threshold visualizations.

FAQ

What iOS versions does this skill support?

The skill primarily targets iOS 16+ for basic charts (BarMark, LineMark, PointMark, AreaMark), iOS 17+ for selection and scrollable charts, iOS 18+ for vectorized plots, and iOS 26+ for 3D charts and surface plots.

When should I use vectorized plots instead of regular marks?

Use vectorized plots (BarPlot, LinePlot, AreaPlot, PointPlot) when working with 1000+ data points in 2D visualizations. They provide better performance for large datasets compared to composing individual marks.

Can I mix different chart types in a single visualization?

Yes, you can combine multiple mark types within a single Chart container using the content closure init. This allows you to create composite visualizations like line charts with threshold rules or bar charts with point overlays.

When should I use Chart3D versus regular Chart?

Use Chart3D only for real spatial data or surface visualizations. Regular 2D Chart is appropriate for most data visualization needs including time series, categorical comparisons, and distributions.

How do I create multi-series charts?

Create multi-series charts by using foregroundStyle encoding with `.foregroundStyle(by:)` for automatic color differentiation, or use the explicit `series:` parameter in marks like LineMark to define distinct data series.