dnrops/LightChart

LightChart is a lightweight SwiftUI package with line charts implementation. You can use it when you need only a chart that will perfectly fit into your View. It doesn’t have any interaction, titles, different types of diagram or anything else, just a representation of your data set.

Currently LightChart have only line type of chart with sharp corners or a curved one. That’s how it looks in the real application on currency exchange rates example:

Installation

It’s a Swift Package, so you need to do the following:

Open File in Xcode menu
Open Swift Packages
Choose Add Package Dependency... option
In the Enter package repository URL field paste this URL: https://github.com/pichukov/LightChart
Choose any existing version or a master branch option

Usage

Add import LightChart Add LightChartView into your SwiftUI code

LightChartView(data: [4, 8, 12, 10, 25])

By default it will draw a red line chart:

To customize it you can use several properties:

type

The type of chart, it’s an enum with two cases:

.line is a default type that will draw a chart presented above

.curved will draw a curved chart, for example:

LightChartView(data: [2, 17, 9, 23, 10], type: .curved)

visualType

The visual part of the chart. An enum with three cases:

.outline(color: Color, lineWidth: CGFloat) to specify a color and lineWidth for stroke

LightChartView(data: [2, 17, 9, 23, 10], 
             type: .curved, 
             visualType: .outline(color: .green, lineWidth: 5))

.filled(color: Color, lineWidth: CGFloat) use stroke color to fill the chart with a gradient

LightChartView(data: [2, 17, 9, 23, 10],
             type: .curved,
             visualType: .filled(color: .green, lineWidth: 5))

.customFilled(color: Color, lineWidth: CGFloat, fillGradient: LinearGradient) also provides an option to change the fill gradient

LightChartView(data: [2, 17, 9, 23, 10],
             type: .curved,
             visualType: .customFilled(color: .red,
                                       lineWidth: 3,
                                       fillGradient: LinearGradient(
                                                  gradient: .init(colors: [Color.orange.opacity(0.7), Color.orange.opacity(0.1)]),
                                                  startPoint: .init(x: 0.5, y: 1),
                                                  endPoint: .init(x: 0.5, y: 0)
                                               )))

offset

By default the offset is 0 and it means that the chart takes up the entire area of the parent view. You can move the chart line up with changing the offset value. For example if you will use the offset: 0.2 you chart line will move up and take only 80% of the parent view

LightChartView(data: [2, 17, 9, 23, 10],
               type: .curved,
               visualType: .filled(color: .green, lineWidth: 3),
               offset: 0.2)

As you can see on picture above the offset effects only the chart line but not the fill gradient

currentValueLineType

There is an option to add a horizontal line that will point the last value of the data set. A currentValueLineType is an enum that has three cases:

.none is a default value that doesn’t show any line

.line(color: Color, lineWidth: CGFloat) adds a line with color and lineWidth for a stroke

LightChartView(data: [2, 17, 9, 23, 10],
             type: .curved,
             visualType: .filled(color: .green, lineWidth: 3),
             offset: 0.2,
             currentValueLineType: .line(color: .gray, lineWidth: 1))

.dash(color: Color, lineWidth: CGFloat, dash: [CGFloat]) adds a dashed line

LightChartView(data: [2, 17, 9, 23, 10],
             type: .curved,
             visualType: .filled(color: .green, lineWidth: 3),
             offset: 0.2,
             currentValueLineType: .dash(color: .gray, lineWidth: 1, dash: [5]))