SwiftCharts

Easy to use and highly customizable charts library for iOS

Features:

Bars - plain, stacked, grouped, horizontal, vertical
Scatter
Line / Multiple lines
Areas
Bubble
Multiple axis
Multiple labels (x axis)
Candlestick
Cubic line
Everything is customizable - views (uses normal UIViews so everything is possible), animations, colors, units, axis
Charts can be combined with each other (e.g. lines + bars + circles)
Complex interactivity support
Easy extensibility
Easy to use: no learning curve, no complicated settings - just assemble chart using well defined components.

Swift 1.2, iOS 7/8. Swift 2.0 branch (latest test on XCode 7 beta 3).

Video

Screenshots:

ScreenShot

Installation

Add to your podfile:

use_frameworks!
pod 'SwiftCharts', '~> 0.2'

Or to use the Swift 2.0 branch:

use_frameworks!
pod 'SwiftCharts', :git => 'https://github.com/i-schuetz/SwiftCharts.git', :branch => 'swift2.0'

And then:

pod install

Import the framework in your code:

import SwiftCharts

Usage examples

Multiline chart:

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

let chart = LineChart(
    frame: CGRectMake(0, 70, 300, 500),
    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.redColor()),
        (chartPoints: [(2.0, 2.6), (4.2, 4.1), (7.3, 1.0), (8.1, 11.5), (14.0, 3.0)], color: UIColor.blueColor())
    ]
)

self.view.addSubview(chart.view)

Bars chart:

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

let chart = BarsChart(
    frame: CGRectMake(0, 70, 300, 500),
    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.redColor(),
    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:

ScreenShot

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 labelSettings = ChartLabelSettings(font: ExamplesDefaults.labelFont)

let chartPoints = [(2, 2), (3, 1), (5, 9), (6, 7), (8, 10), (9, 9), (10, 15), (13, 8), (15, 20), (16, 17)].map{ChartPoint(x: ChartAxisValueInt($0.0), y: ChartAxisValueInt($0.1))}

let xValues = Array(stride(from: 2, through: 16, by: 2)).map {ChartAxisValueInt($0, labelSettings: labelSettings)}
let yValues = Array(stride(from: 0, through: 20, by: 2)).map {ChartAxisValueInt($0, labelSettings: labelSettings)}

let xModel = ChartAxisModel(axisValues: xValues, axisTitleLabel: ChartAxisLabel(text: "Axis title", settings: labelSettings))
let yModel = ChartAxisModel(axisValues: yValues, axisTitleLabel: ChartAxisLabel(text: "Axis title", settings: labelSettings))
let chartFrame = ExamplesDefaults.chartFrame(self.view.bounds)

let chartSettings = ExamplesDefaults.chartSettings
let coordsSpace = ChartCoordsSpaceLeftBottomSingleAxis(chartSettings: chartSettings, chartFrame: chartFrame, xModel: xModel, yModel: yModel)
let (xAxis, yAxis, innerFrame) = (coordsSpace.xAxis, coordsSpace.yAxis, coordsSpace.chartInnerFrame)

// create layer with line
let lineModel = ChartLineModel(chartPoints: chartPoints, lineColor: UIColor(red: 0.4, green: 0.4, blue: 1, alpha: 0.2), lineWidth: 3, animDuration: 0.7, animDelay: 0)
let chartPointsLineLayer = ChartPointsLineLayer(xAxis: xAxis, yAxis: yAxis, innerFrame: innerFrame, lineModels: [lineModel])

// view generator - creates circle view for each chartpoint
let circleViewGenerator = {(chartPointModel: ChartPointLayerModel, layer: ChartPointsLayer, chart: Chart) -> UIView? in
    return ChartPointCircleView(center: chartPointModel.screenLoc, size: CGSizeMake(20, 20), settings: ChartPointCircleViewSettings(animDuration: 0.5))
}
// create layer that uses the view generator
let chartPointsCircleLayer = ChartPointsViewsLayer(xAxis: xAxis, yAxis: yAxis, innerFrame: innerFrame, chartPoints: chartPoints, viewGenerator: circleViewGenerator, displayDelay: 0, delayBetweenItems: 0.05)

// create layer with guidelines
var settings = ChartGuideLinesDottedLayerSettings(linesColor: UIColor.blackColor(), linesWidth: ExamplesDefaults.guidelinesWidth, axis: .XAndY)
let guidelinesLayer = ChartGuideLinesDottedLayer(xAxis: xAxis, yAxis: yAxis, innerFrame: innerFrame, settings: settings)

let chart = Chart(
    frame: chartFrame,
    layers: [
        xAxis,
        yAxis,
        guidelinesLayer,
        chartPointsLineLayer,
        chartPointsCircleLayer
    ]
)

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

Layers are semantic units that can add views to the chart, or can simply draw in the chart's context for a better performance. Which makes more sense depends on the requirements.

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!

Note on performance:

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.

Version:

0.2.2

Contributing

Fork
Commit changes to a branch in your fork
Push your code and make a pull request

Created By:

Ivan Schütz

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

Swiftcharts