How to Create Charts on iOS using SwiftUI

This content originally appeared on DEV Community 👩‍💻👨‍💻 and was authored by Sean Coughlin

SwiftUI Natively Supports Charting

Starting with iOS 16, iPadOS 16, and watchOS 9, SwiftUI supports the native creation of charts. Before those versions were released in 2022, creating a chart required tons of development work or an outside dependency.

Requirements

Creating charts using SwiftUI requires developing an iOS app targeted at iOS 16 and above.

Mark Types

Mark types are used to plot data onto charts. Apple defines six mark types.

How to Create a Basic Bar Chart

Every chart starts with a Chart view. The Chart view is the container for the data. Inside the Chart view, you can start providing data using one of Apple's predefined marks.

Chart {
    BarMark(
        x: .value("Type", "Swift"),
        y: .value("Total Count", 5)
    )
    BarMark(
        x: .value("Type", "UI"),
        y: .value("Total Count", 4)
    )
    BarMark(
        x: .value("Type", "Chart"),
        y: .value("Total Count", 3)
    )
 }

A more advanced bar graph example can be found over on my Github.

How to Create a Line Graph

A line graph can be created by using LineMark inside a Chart view.

Chart {
    LineMark(
        x: .value("Type", "Swift"),
        y: .value("Total Count", 5)
    )
    LineMark(
        x: .value("Type", "UI"),
        y: .value("Total Count", 4)
    )
    LineMark(
        x: .value("Type", "Chart"),
        y: .value("Total Count", 3)
    )
 }

How to Create a Scatter Plot

Finally, a scatter graph can be created by using PointMark inside a Chart view.

Chart {
    PointMark(
        x: .value("Type", "Swift"),
        y: .value("Total Count", 5)
    )
    PointMark(
        x: .value("Type", "UI"),
        y: .value("Total Count", 4)
    )
    PointMark(
        x: .value("Type", "Chart"),
        y: .value("Total Count", 3)
    )
 }

How to Label Chart Data

Data can be labeled using a PlottableValue.

PointMark(
    x: .value("Type", "Swift"),
    y: .value("Total Count", 5)
).foregroundStyle(by: .value("Series", "Swift"))

Conclusion

SwiftUI Charts is a powerful and easy-to-use option that brings crucial functionality to native support. Try including it in your next app hacking project.

Sources

This content originally appeared on DEV Community 👩‍💻👨‍💻 and was authored by Sean Coughlin

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Sean Coughlin | Sciencx (2022-09-22T19:41:05+00:00) How to Create Charts on iOS using SwiftUI. Retrieved from https://www.scien.cx/2022/09/22/how-to-create-charts-on-ios-using-swiftui/

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