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SwiftCharts

Easy to use and highly customizable charts library for iOS

Features:

• Bars - plain, stacked, grouped, horizontal, vertical
• Scatter
• Lines (straight/cubic/custom path generator)
• Areas
• Bubble
• Multiple axes
• Candlestick
• Multiple labels per value (x axis)
• Everything is customizable - colors, views, units, labels, animations, interactions, axes, etc.
• Easy creation of arbitrary markers, overlays, info views, etc., using simple UIViews!
• Modular architecture, which allows to easily create new chart types or add effects to existing types externally (without library changes).
• Charts can be combined with each other.
• Pie chart*
• Legends*
• Zooming & panning, lockable to x/y axis, max delta or both. Elastic effect. (unreleased)
• Extensible axis values and label generators for numbers, dates, etc, with customizable zooming handling (nice numbers, divide in half, etc). (unreleased).

_{*These are separate repos for better focus and reusability.}

iOS 7+

Video

Documentation

Installation

CocoaPods

Add to your Podfile:

use_frameworks!
pod 'SwiftCharts', '~> 0.6.5'

To use master directly:

pod 'SwiftCharts', :git => 'https://github.com/i-schuetz/SwiftCharts.git'

And then:

pod install

Import the framework in your code:

import SwiftCharts

Carthage

Add to your Cartfile:

github "i-schuetz/SwiftCharts" ~> 0.6.5

Contribute

Contributions are highly appreciated! To submit one:

1. Fork
2. Commit changes to a branch in your fork
3. Push your code and make a pull request

Quick start

Multiline chart:

let chartConfig = ChartConfigXY(
    xAxisConfig: ChartAxisConfig(from: 2, to: 14, by: 2),
    yAxisConfig: ChartAxisConfig(from: 0, to: 14, by: 2)
)

let frame = CGRect(x: 0, y: 70, width: 300, height: 500)

let chart = LineChart(
    frame: frame,
    chartConfig: chartConfig,
    xTitle: "X axis",
    yTitle: "Y axis",
    lines: [
        (chartPoints: [(2.0, 10.6), (4.2, 5.1), (7.3, 3.0), (8.1, 5.5), (14.0, 8.0)], color: UIColor.red),
        (chartPoints: [(2.0, 2.6), (4.2, 4.1), (7.3, 1.0), (8.1, 11.5), (14.0, 3.0)], color: UIColor.blue)
    ]
)

self.view.addSubview(chart.view)

Bars chart:

let chartConfig = BarsChartConfig(
    valsAxisConfig: ChartAxisConfig(from: 0, to: 8, by: 2)
)

let frame = CGRect(x: 0, y: 70, width: 300, height: 500)
        
let chart = BarsChart(
    frame: frame,
    chartConfig: chartConfig,
    xTitle: "X axis",
    yTitle: "Y axis",
    bars: [
        ("A", 2),
        ("B", 4.5),
        ("C", 3),
        ("D", 5.4),
        ("E", 6.8),
        ("F", 0.5)
    ],
    color: UIColor.red,
    barWidth: 20
)

self.view.addSubview(chart.view)
self.chart = chart

Concept:

• Layer architecture, which makes it extremely easy to customize charts, create new types, combine existing ones and add interactive elements.

• Creation of views via a generator function, which makes it easy to use custom views in any layer.

Main Components:

1. Layers:

A chart is the result of composing layers together. Everything is a layer - axis, guidelines, dividers, line, circles, etc. The idea is to have losely coupled components that can be easily changed and combined. This is for example the structure of a basic chart, which shows a line with circles:

Following a more low level example, to provide an insight into the layer system. Note that most examples are written like this, in order to provider maximal flexibility.

let chartPoints: [ChartPoint] = [(2, 2), (4, 4), (6, 6), (8, 8), (8, 10), (15, 15)].map{ChartPoint(x: ChartAxisValueInt($0.0), y: ChartAxisValueInt($0.1))}

let labelSettings = ChartLabelSettings(font: ExamplesDefaults.labelFont)

let generator = ChartAxisGeneratorMultiplier(2)
let labelsGenerator = ChartAxisLabelsGeneratorFunc {scalar in
    return ChartAxisLabel(text: "\(scalar)", settings: labelSettings)
}

let xGenerator = ChartAxisGeneratorMultiplier(2)

let xModel = ChartAxisModel(firstModelValue: 0, lastModelValue: 16, axisTitleLabels: [ChartAxisLabel(text: "Axis title", settings: labelSettings)], axisValuesGenerator: xGenerator, labelsGenerator: labelsGenerator)

let yModel = ChartAxisModel(firstModelValue: 0, lastModelValue: 16, axisTitleLabels: [ChartAxisLabel(text: "Axis title", settings: labelSettings.defaultVertical())], axisValuesGenerator: generator, labelsGenerator: labelsGenerator)

let chartFrame = ExamplesDefaults.chartFrame(view.bounds)

let chartSettings = ExamplesDefaults.chartSettingsWithPanZoom

// generate axes layers and calculate chart inner frame, based on the axis models
let coordsSpace = ChartCoordsSpaceLeftBottomSingleAxis(chartSettings: chartSettings, chartFrame: chartFrame, xModel: xModel, yModel: yModel)
let (xAxisLayer, yAxisLayer, innerFrame) = (coordsSpace.xAxisLayer, coordsSpace.yAxisLayer, coordsSpace.chartInnerFrame)

// create layer with guidelines
let guidelinesLayerSettings = ChartGuideLinesDottedLayerSettings(linesColor: UIColor.black, linesWidth: ExamplesDefaults.guidelinesWidth)
let guidelinesLayer = ChartGuideLinesDottedLayer(xAxisLayer: xAxisLayer, yAxisLayer: yAxisLayer, settings: guidelinesLayerSettings)

// view generator - this is a function that creates a view for each chartpoint
let viewGenerator = {(chartPointModel: ChartPointLayerModel, layer: ChartPointsViewsLayer, chart: Chart) -> UIView? in
    let viewSize: CGFloat = Env.iPad ? 30 : 20
    let center = chartPointModel.screenLoc
    let label = UILabel(frame: CGRect(x: center.x - viewSize / 2, y: center.y - viewSize / 2, width: viewSize, height: viewSize))
    label.backgroundColor = UIColor.green
    label.textAlignment = NSTextAlignment.center
    label.text = chartPointModel.chartPoint.y.description
    label.font = ExamplesDefaults.labelFont
    return label
}

// create layer that uses viewGenerator to display chartpoints
let chartPointsLayer = ChartPointsViewsLayer(xAxis: xAxisLayer.axis, yAxis: yAxisLayer.axis, chartPoints: chartPoints, viewGenerator: viewGenerator, mode: .translate)

// create chart instance with frame and layers
let chart = Chart(
    frame: chartFrame,
    innerFrame: innerFrame,
    settings: chartSettings,
    layers: [
        xAxisLayer,
        yAxisLayer,
        guidelinesLayer,
        chartPointsLayer
    ]
)

view.addSubview(chart.view)
self.chart = chart

Layers decide how to present their data - this can be done adding subviews, (CA)layers, with core graphics, etc.

2. View generators:

View based layers will use a generator function to generate chart point views. This function receives the complete state of each chartpoint (model data, screen location) and produces an UIView, allowing any type of customization.

Hello world:

There's a hello world included in the examples, similar to the above code, with a bit more explanations. Change some properties of the generated views, copy paste the chartPointsLineLayer used in the snippet above, and pass it to the chart's layers, to display a line behind the views, and you have already mastered the main concepts!

Important!

• Don't forget to always keep a strong reference to the chart instance or it will be released, which leads to axis & labels not showing.

• If you have a lot of axis labels in your chart it may be necessary to do the calculation of the coordinate space in the background, to avoid possible delays which are noticeable during transitions or scrolling. See ScrollExample or MultipleAxesExample example for this.

Tasks

SwiftCharts has got now some projects to plan features and improvements. Feel free to grab any of these topics even if it's just to add feedback. You can open an issue for this. Other options like opening a Slack channel are possible.

Created By:

Ivan Schütz

If you need something special or are just short of time, I'm also available for hire

Credits:

A big thank you to the awesome grafiti.io for having been sponsoring this project in the last months, and of course also to all the contributors!

License

SwiftCharts is Copyright (c) 2015 - 2019 Ivan Schütz and released as open source under the attached Apache 2.0 license.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

This is a port to Swift and (massively improved) continuation of an obj-c project which I did while working at eGym GmbH https://github.com/egymgmbh/ios-charts