SciChart® the market leader in Fast WPF Charts, WPF 3D Charts, iOS Chart, Android Chart and JavaScript Chart Components

0 votes

Currently we have two graph surfaces with two Y axes on each side and we need all of the Y axes to have fixed width size. Until now we were achieving that like this:
topGraphSurface.LeftAxisAreaForcedSize = 45;
topGraphSurface.RightAxisAreaForcedSize = 45;
bottomGraphSurface.LeftAxisAreaForcedSize = 45;
bottomGraphSurface.RightAxisAreaForcedSize = 45;

but since updating to the new SciChart v3 we get the error “SciChartSurface does not contain a definition for (Left)AxisAreaForcedSize”. I couldn’t find any information about this in the Migration guide, so is there a way to achieve this in the new version?

0 votes

Have recently converted to xcode 10 and swift 4.2.

Am now receiving this error message on build.

Reason: no suitable image found. Did find:
/usr/lib/libstdc++.6.dylib: mach-o, but not built for iOS simulator

Any ideas?

1 vote


Am trying to limit the depth in which the user can zoom into and out of the graph. I came across the property minimalZoomConstrain in the header file and also the documentation and had attempted to use it.

The axis in question is a DateTimeAxis and I would want to limit the zoom in depth to 30 seconds and the zoom out the about 3 months. I understand that the type it takes is the GenericType, where I will have to use the SCIGeneric(x) to assign the value, but what value x am I required to use in this case?

I’ve tried the values ’30′(assuming it takes NSTimeInterval) and even attempted to pass in a NSDate value but nothing seems to work.

Thank you.

  • Elle Yeoh asked 6 years ago
  • last active 6 years ago
0 votes

Using custom label provider I am able to format the cursor label, but still there is the name of the axis. I only want to show the value here, like “0,91” and remove the “X:” (see attached screenshots).

Thanks in advance.

override func formatCursorLabel(_ dataValue: SCIGenericType) -> String! {
    return "" // super.formatCursorLabel(dataValue)
0 votes

Hi, guys

I’m interesting in alignment for line at SCIAxisMarkerAnnotation. For example for top, middle and bottom position. Like at alignment_to_top.png. So is there some possibility for this?

UDP: Is there possibility to hide annotation from chart view?
Something like setHidden: for UIView.

Best regards,
Sushynski Andrei

0 votes

Hello, I have tried to see if it is possible to show the rollover without showing any labels so that is is just a vertical bar. I was searching on StackOverflow and a few answers said it was not possible to omit any of the values from the graph. I did see that we can customize the cursor, is it possible to just have it be a vertical bar instead of a cross?? Then I could just use it instead of the default rollover.

I am linking a mockup we made of what we want to make. In the image, you have the graphic showing where the use as pressed, and above the graphic, we will show and update a graphic with the relevant information for that point.

Also, I will need to programmatically dismiss it so it will need to stay visible even if the user is panning or zooming.

1 vote

I didn’t see anything in any docs, so I am just wanting to verify this info…

Is this correct that you have to link in and ship the libSwiftCore (+ other swift libs) with an app using SciCharts on iOS? When I added the chart library to my app; the app crashed at startup with missing dynamic load of libSwiftCore.dylib on a real device (emulators run fine).

Enabling ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES in the build settings fixed this issue. But this surprised me that the SciChart library would actually require Swift.

Was this intentional; or did the library somehow pickup an unintentional reference somewhere….

0 votes

Hi, guys

I have some data series like:

[[SCIXyDataSeries alloc] initWithXType:SCIDataType_DateTime

Also my Y axis is kind of class SCINumericAxis

So my question is

if i’m trying add value to the series

[volumeSerie appendX:SCIGeneric(bar.time) Y:SCIGeneric([bar.volume doubleValue])];

and my bar.volume is bigger than 2 147 483 648 (float limit as i’m know). It’s leads to a axis range crash. Like on the attached image.

So what should i use to handle huge values?
Like a billions and more

Best regards,
Sushynski Andrei

0 votes

I have just learned how to use sci-chart framework with tutorials.
And I tried to add values from bluetooth as realtime chart as shown in tutorials.
I have finished receiving data from a Bluetooth connection.
However, using scichart to represent this data in real time is hard to solve by looking at the tutorial alone.
Does anyone have any idea how to use real-time tutorials to teach you how to represent your own data, not the example sine graph?

The code below is what I tried and is wrong.

import UIKit
import CoreBluetooth
import SciChart

let maestroServiceCBUUID = CBUUID(string:”495sdfd3-FE7D-4AE5-8FA9-9FAFD205E455″)
let maestroBrainDataCBUUID = CBUUID(string: “4953sdf3-1E4D-4BD9-BA61-23C647249616”)
class HRMViewController: UIViewController {
var sciChartSurface: SCIChartSurface?

var lineDataSeries: SCIXyDataSeries!
var scatterDataSeries: SCIXyDataSeries!

var lineRenderableSeries: SCIFastLineRenderableSeries!
var scatterRenderableSeries: SCIXyScatterRenderableSeries!

var timer: Timer?
var phase = 0.0
var i = 0

@IBOutlet weak var brainRateLabel: UILabel!

var centralManager: CBCentralManager!
var maestroPeripheral:CBPeripheral!
override func viewDidLoad() {

sciChartSurface = SCIChartSurface(frame: self.view.bounds)
sciChartSurface?.autoresizingMask = [.flexibleHeight, .flexibleWidth]
sciChartSurface?.translatesAutoresizingMaskIntoConstraints = true


let xAxis = SCINumericAxis()
xAxis.growBy = SCIDoubleRange(min: SCIGeneric(0.1), max: SCIGeneric(0.1))

let yAxis = SCINumericAxis()
yAxis.growBy = SCIDoubleRange(min: SCIGeneric(0.1), max: SCIGeneric(0.1))


centralManager = CBCentralManager(delegate: self , queue: nil)

// Make the digits monospaces to avoid shifting when the numbers change

override func viewWillAppear(_ animated: Bool) {

if nil == timer{
  timer = Timer.scheduledTimer(withTimeInterval: 0.01, repeats: true, block: updatingDataPoints)


override func viewWillDisappear(_ animated: Bool) {

if nil != timer{
  timer = nil


func updatingDataPoints(timer:Timer){

i += 1

lineDataSeries.appendX(SCIGeneric(i), y: SCIGeneric(cos(Double(i)*0.1 + phase)))
scatterDataSeries.appendX(SCIGeneric(i), y: SCIGeneric(cos(Double(i)*0.1 + phase)))

phase += 0.01



func createDataSeries(_brainwave2:Double){
// Init line data series
lineDataSeries = SCIXyDataSeries(xType: .double, yType: .double)
lineDataSeries.fifoCapacity = 500
lineDataSeries.seriesName = “line series”

// Init scatter data series

// scatterDataSeries = SCIXyDataSeries(xType: .double, yType: .double)
// scatterDataSeries.fifoCapacity = 500
// scatterDataSeries.seriesName = “scatter series”

for i in 0...500{
  lineDataSeries.appendX(SCIGeneric(i), y: SCIGeneric(_brainwave2))

// scatterDataSeries.appendX(SCIGeneric(i), y: SCIGeneric(cos(Double(i)*0.1)))

i = Int(lineDataSeries.count())


func createRenderableSeries(){
lineRenderableSeries = SCIFastLineRenderableSeries()
lineRenderableSeries.dataSeries = lineDataSeries

scatterRenderableSeries = SCIXyScatterRenderableSeries()
scatterRenderableSeries.dataSeries = scatterDataSeries



func addModifiers(){
let xAxisDragmodifier = SCIXAxisDragModifier()
xAxisDragmodifier.dragMode = .pan
xAxisDragmodifier.clipModeX = .none

let yAxisDragmodifier = SCIYAxisDragModifier()
yAxisDragmodifier.dragMode = .pan

let extendZoomModifier = SCIZoomExtentsModifier()
let pinchZoomModifier = SCIPinchZoomModifier()

let rolloverModifier = SCIRolloverModifier()
let legend = SCILegendModifier()

let groupModifier = SCIChartModifierCollection(childModifiers: [xAxisDragmodifier, yAxisDragmodifier, pinchZoomModifier, extendZoomModifier, legend, rolloverModifier])

sciChartSurface?.chartModifiers = groupModifier


func brainwaveReceived(_ brainWave:Double){
let brainWave = brainWave * 3.3 / 65536
brainRateLabel.text = String(brainWave)
print(“brainwave: (brainWave)”)


extension HRMViewController: CBCentralManagerDelegate {
func centralManagerDidUpdateState(_ central: CBCentralManager) {
switch central.state {

case .unknown:
  print("central.state is . unknown")
case .resetting:
  print("central.state is . resetting")
case .unsupported:
  print("central.state is . unsupported")
case .unauthorized:
  print("central.state is . unauthorized")
case .poweredOff:
  print("central.state is . poweredOff")
case .poweredOn:
  print("central.state is . poweredOn")


func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
if == “MAESTRO1” {
// maestroPeripheral = peripheral
maestroPeripheral = peripheral
maestroPeripheral.delegate = self

func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {

extension HRMViewController:CBPeripheralDelegate{
func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
guard let services = else {return}
for service in services {
peripheral.discoverCharacteristics(nil, for: service)
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
guard let characteristics = service.characteristics else {return}

for characteristic in characteristics {
    print("\(characteristic.uuid): properties contain .read")
    print("\(characteristic.uuid): properties contain .notify")
    peripheral.setNotifyValue(true , for: characteristic)


func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic,
error: Error?) {
switch characteristic.uuid {
case maestroBrainDataCBUUID:
let wave = Double(brainData(from: characteristic))*3.3/65536

  print("Unhandled Characteristic UUID: \(characteristic.uuid)")

private func brainData(from characteristic: CBCharacteristic) -> Int {
guard let characteristicData = characteristic.value else { return -1 }
let byteArray = UInt8

let firstBitValue = byteArray[0] & 0x01
if firstBitValue == 0 {
  // Heart Rate Value Format is in the 2nd byte
  return Int(byteArray[1])
} else {
  // Heart Rate Value Format is in the 2nd and 3rd bytes
  return (Int(byteArray[1]) << 8) + Int(byteArray[2])



0 votes


I am developing a Xamarin iOS application and I’m using a SCIPieChartSurface. I can create the chart and set its values, but is is not possible to auto-update the donut with new data.
I am trying to update the value by doing:

myDonut.MyPieSegment.Value = newValue;

But nothing happends…

I heard it was a bug in the API for Android a month ago, is this similar? Or am I doing something wrong?
Thanks in advance!

Best regards

0 votes

I’m using Xamarin.iOS and the SciChart.iOS NuGet. When adding a LabelProvider to an axis the iPhoneSimulator with iOS 13.2 crashes without warning or exception back to the phone menu. This issue is not present on Android using the same API usage pattern.

This effect is not just in my own apps but can be replicated by running the latest Examples app on the same simulator. Examples which demonstrate the same behaviour include “Custom Theme”, Stacked Column Side by Side Chart”, “Using Theme Manager”, all of which set the LabelProvider in the source code.

Is this a known bug? Maybe an incompatibility with the latest version of Xamarin.iOS.

I noticed that this issue has been reported before.

This is a deal breaker for us at the moment as formatting axis labels is pretty crucial.

0 votes

We have 2 graph surfaces with 2 Y axes on each side, but the label formatting of the axes is different. That makes the axes widths different and therefore both the graphs appear as they have different widths. Is there a way to make the axis widths fixed so the graphs can be the same size?

0 votes
0 answers

iOS 11.2 with xCode 9.2

I have a chart with two data series and a legend. The chart lives in a view controller that is embedded in a navigation controller. I configured the navigation bar to hide itself when the phone it tilted into landscape mode: navigationController.hidesBarsWhenVerticallyCompact = true

When I tilt the phone the navigation bar is hidden as expected. However when I tap on the chart legend to turn off one of the data series I see the navigation bar re-appears. Screen shots attached.

1 vote

I have been trying to find a tutorial for ViewPortManagers for IOS and Xamarin.ios. Has anyone been able to pull this off and willing to share an example?

0 votes

Hi, guys

Is it possible to use negative index for methods:

-(void) insertAt:(int)index X:(SCIGenericType)x Open:(SCIGenericType)open High:(SCIGenericType)high Low:(SCIGenericType)low Close:(SCIGenericType)close;

-(void) updateAt:(int)index Open:(SCIGenericType)open High:(SCIGenericType)high Low:(SCIGenericType)low Close:(SCIGenericType)close;

Can you give an answer?

Best regards,
Sushynski Andrei

0 votes

I just requested a trial key and notice that it say I have to put a license call into my app.

Does this mean my app will require internet so it can verify a license when the user starts the app?

Will it do this all the time?

I do not like this at all. I don’t want my customers asking why my app requires internet and is contacting some server when they start the app.

  • Tony Pitman asked 11 months ago
  • last active 10 months ago
0 votes

I wanna make chart area background color white.
And I implemented it like below.

surface.xAxes.defaultAxis()?.style.gridBandBrush.color = .white
surface.yAxes.defaultAxis()?.style.gridBandBrush.color = .white

Then, some part became white, but not whole area.
I wanna remove those black areas, so I used theme manager, and it worked.

SCIThemeManager.applyTheme(toThemeable: surface, withThemeKey: “SciChart_Bright_Spark”)
surface.xAxes.defaultAxis()?.style.gridBandBrush.color = .white
surface.yAxes.defaultAxis()?.style.gridBandBrush.color = .white

But, this is not reasonable. I use that theme, only to change background color.
Is there another way to acheive white background?

  • Minsub Kim asked 4 years ago
  • last active 4 years ago
0 votes

Hi guys,

I have some troubles with piecharts in swift. I want to provide custom labels outside of the piecharts segments. I found a screenshot of a nested piechart attached to an issue in your issue tracker. Thats what I want to do in swift, but I couldn’t find out a way to do so. Could you please provide an example code?

Thanks a lot in advance!

1 vote

We’d like to customize the look of our legends. We have 4 legends displaying different data, but right now the only thing we can change is the Theme. Is there any way to customize the legend items, like add some icons, change the point marker shape and size, change the check box icon etc…

P.S.: I’m not a trial user. We have an iOS, Android and WPF licenses purchased.

Project info:

0 votes


I am unable to install SciChart pod.
The podfile has multiple pods with multiple platforms and source.
I get the error saying ” [!] Unable to find a specification for ‘SciChart’.”
Please advice..


pod 'UICircularProgressRing'
pod 'Alamofire'

platform :ios, '8.0'
source ''

pod 'SideMenu'

source ''
pod 'SciChart', :git => ''
0 votes

How can we restrict stacked graph chart scrolling to future date ?

0 votes


We need to add a label with the value of the yAxis on top of all Point Markers. There is an example on WPF, but found nothing on iOS.

How can we achieve that?

0 votes

I’m trying to clear a SCIUniformHeatmapDataSeries after connecting it to a SCIChartSurface, but it is very slow and energy consuming. However, if I clear the data series before it is connected to the sci chart, then the clearing is pretty fast. How can I clear the data series after it is connected to the chart surface quickly? Do I have to make a new data series, clear it, and connect to the scichartsurface every time I want to clear a data series? This is for iOS by the way.
EDIT: code

for i in 0..<data.MATRIX_COLUMNS {
        for j in 0..<data.MATRIX_ROWS  {
            data.ecm2DMatrix[i][j] = Double.nan
            SCIUpdateSuspender.usingWith(charts.ecmSurface) {
      [i][j], atX: i, y: j)
1 vote
0 answers

I am following the MultiPaneStockChart example. I want to sync multiple chart and I want to sync it on x axis. but it’s not happening although zoom and pinch is working.
Can anyone point me what am I missing?

0 votes

I couldnt find IPointMarkerPaletteProvider Interface in SciChart iOS framework. I want to change the color of the point markers of line series on tapping the markers. With IPointMarkerPaletteProvider it would have been easier.

SCIPaletteProvider is there but how do I provide the colors to each markers through that. Is there any other way to go about it ?

  • Ayush Jain asked 3 years ago
  • last active 3 years ago
0 votes

I am creating iOS aplication which displays charts based on stocks data.
I want to create box annotations to show when market is open or closed.
I am using CategoryDateTimeAxis to display data but when i add AnnotationCollection with BoxAnnotations to Surface i can not see the annotations.

This is my code for creating box Annotation:

    let pre = SCIBoxAnnotation()
    pre.coordinateMode = .relative
    pre.x1 = SCIGeneric(setDate(date, 4, 0, 0)!)
    pre.x2 = SCIGeneric(setDate(date, 9, 30, 0)!)
    pre.y1 = SCIGeneric(max )
    pre.y2 = SCIGeneric(0)
    pre.isEditable = false = SCISolidBrushStyle(color: #colorLiteral(red: 0.01680417731, green: 0.1983509958, blue: 1, alpha: 0.13)) = SCISolidPenStyle(color: .clear, withThickness: 0)
  • Marcin C asked 5 years ago
  • last active 5 years ago
0 votes

It would be nice to have an access to repo through CocoaPods. You can create a private spec repo and share with developers.

0 votes

I have a question about the font of the label text. When the screen is captured and enlarged, the character has an outline border. Is there a way to get rid of this border? Japanese Kanji font is used.
Thank you.

var yAxisLeft = new SCINumericAxis();
yAxisLeft.AxisTitle = syAxLeft;
yAxisLeft.AxisId = "Primary Y-Axis";
yAxisLeft.AxisAlignment = SCIAxisAlignment.Left;
yAxisLeft.TitleStyle = new SCIFontStyle(14, UIColor.Green);
yAxisLeft.TickLabelStyle = new SCIFontStyle(14, UIColor.Green);
yAxisLeft.DrawMajorBands = false;
yAxisLeft.DrawMinorGridLines = false;
1 vote


Out team have several question about the framework:

  1. Is there a way to make SCIChartSurfaceView background transparent so that the user could see underlying views? We tried using background brush of clear color on SCIChartSurface and making SCIChartSurfaceView backgroundColor transparent but no avail.

  2. Is it possible to add translate/rotate/scale animation to markers/annotations from code?

  3. When using gradient brush with mountain renderable series we found a strange visual artifact (“Gradient artifact” image). Is there a way to fix it?

Best regards,

0 votes

I am plotting a line chart and in it I have a requirement to plot different sets of points in different colours. How can I achieve this ?

I am setting the colour as below

[[(SCIFastLineRenderableSeries*)self.renderableSeries style] setLinePen: [[SCIPenSolid alloc] initWithColor:[UIColor redColor] Width:1]];

However, this sets the colour for the whole data series in line chart.

I have attached the screenshot of the desired output.

  • Chui asked 5 years ago
  • last active 5 years ago
1 vote


i am Swift Language

i am plotting live ECG Data on SciChart Surface. I have added 9 Graph on Storyboard in a UIScrollView for the Following things
Each of the above has data = [Int]
i had written a custom Class for Plotting Live Data

=>Class Specification
Inherited From UIView in a seperate xib which contains
– A Label For Name of the chart,
– A chart to draw data and a label
– for displaying frame buffer speed

=>Requirement a Single Chart (Chart have no modifier added onit)

Everything Works Fine until the scroll start, On Scrolling The chart stop Plotting Data Until the Scroll stops

  • Atiq Tahir asked 3 years ago
  • last active 3 years ago
0 votes

Hi, guys

Is it possible to draw axis line at axis area? See attachment.

1 vote
0 answers

Hi All,

I’ve been trying to get SciCharts and the IOS UIScrollview to work together and have been running into a couple of issues.

The main storyboard has 7 SciChart surfaces plotting realtime data embedded inside a single UI scrollview controller.

1) Charts don’t render when scrollview is actively scrolling

Everything works fine during normal operation and we don’t try to scroll.

Once a finger is placed on the screen, the SciCharts surface stops redrawing. This could be due to the fact that the ‘Scroll’ thread is handled in the UITouch thread and perhaps has higher priority. I don’t know if there is anyway to change the priority of the render routine. I can confirm that everything until ‘Update Data’ and Chart.InvalidateElement() is being called during a scroll action.

2) Scrolling is disallowed when Chart surface is as large as scrollview

This may not be exactly due to scichart but if anyone faced this problem before it would help. If you attempt to scroll when the SciChartSurface is as large as the parent UIScrollView, it doesn’t scroll. Almost like the SciChart surface has the priority of touch and doesn’t let the scroll view see the scroll.

I would greatly appreciate if anyone successfully got UIScrollview and Scicharts working well together. I might be doing a bunch of rookie mistakes.


Adding a quick update,

I could fix (2) by disable User Interactions of the Chart.

Note that you can’t simply disable this in the Main Storyboard, this has to be done programmatically by calling

ChartName.isUserInteractionEnabled = false

So the only real issue is (1), getting the chart to render while scrollview is active.

2 votes

I am currently trying the iOS Charting Library and want to implement a Column series with the drill-down functionality (when touching one of column points by end user). Does the charting component supports the hit-testing or selection feature to determine which point has been clicked at runtime?

  • liza yudup asked 6 years ago
  • last active 6 years ago
0 votes


I’m trying to limit the x-axis panning up to an annotation that I’ve drawn on the graph. This annotation can be beyond the current data’s position (i.e. data’s timestamp is at 5/4/2017 11:00:00, annotation’s position is at 5/4/2017 16:00:00). Is there a method, or any way that I can use to limit the x-axis panning up to the annotation’s position instead of limiting it to the data series’ max X?


0 votes

I’ve downloaded yesterday showcase example from your github:

After providing license key other samples work ok except Audio Analyzer (and the last sales dashboard – shows blank screen).

Problems is somewhere with SpectrogramSurfaceController ( If I commend it out wave plot and fft plot works)

Xcode shows there is some bad memory access at:
[SCIFastUniformHeatMapRenderableSeries internalDrawWithContext:WithData:]

Tested using:
iPhone 5SE
iOS 11.2.5
Xcode 9.2

0 votes


How can i listen annotation selection changes? I try this code but i’m getting error “Cannot assign to property: ‘lineAnnotation’ is immutable”

var lineAnnotation = SCILineAnnotation()
lineAnnotation.annotationSelectionChangedListener = { (annotation, isSelected) in


0 votes
0 answers

We are using the candlestick chart, and scrolling off the ends of the plotted data behaves very strangely:
– If I scroll slowly, the chart expands, anchored to the end of the data set (this is expected)
– If I scroll quickly, it lets me scroll beyond the end of the data set
– Once I have scrolled of the end of the data set, touching the screen again jumps back to the data set
– If I scroll slowly so the chart is expanding, and then release touch, the chart continues to move with inertia. If I clock again it jumpos back to expanding mode.

The combination of all these behaviours makes a very confusing and unsatisfying user experience.

Is there a way to change the behaviour? I had a look at but can’t find anything that might.

We have set:
xAxis is a SCIDateTimeAxis
xAxis.VisibleRange to desired range
xAxis.VisibleRangeLimit = range.Clone() where range is desired range
xAxis.VisibleRangeLimitMode = SCIRangeClipMode.inMax (I guess it should be called minMax but something broke in the build?)
xAxis.AutoRange = SCIAutoRange.Never

with chart modifiers:
– new SCIZoomPanModifier()
– new SCIZoomExtentsModifier()
– new SCIPinchZoomModifier()



1 vote

Originally my chart would
– create the surface
– setup the chart modifiers
– setup the axis
– add the data (SCIFastLineRenderableSeries).

However, it appears that when you .add(new SCIFastLineRenderableSeries) it recreates all the tooltips on each add, and finally on the very last SCIFastLineRenderableSeries that is inserted will get two duplicate tooltips. This happens both with the default tooltips or custom tooltips.

I finally noticed that some of your examples you setup the modifiers at the end after adding the data. So I moved all the chart modifiers into a separate function and called it after the data is setup, and now the proper number of tooltips appears.

This might either need to be noted somewhere prominent in the iOS docs; or even better the order shouldn’t matter.

0 votes

Hi, guys

What is the minimum required sdk version for SciChart v.2?

Such as i have some trouble with IOS 9. See attachment.

Same behavior at real devices.

Can you look at this?

Best regards,
Sushynski Andrei

0 votes

Good day!
I need to determine the value of the visible graph y from the x value and the problem is that I can’t calculate the y value outside of the data I’m rendering
example data:
{ x:1, y: 10 },
{ x:5, y: -5 },
{ x: 9, y: 15}

I use SCISplineMountainRenderableSeries and I need to show the intersection of the graph at point 3.5
I need a point but I have only one coordinate value

how can i get this y value?

0 votes

I have followed the example at: for creating a legend with a custom item.

The initial problem I am trying to solve is that the default legend has a black background but my chart is white. If I set the background of the legend to white, this is a problem because the series text is white, so you can’t read it any longer. Therefore in order to have a legend with a white background to match my chart, I needed custom legend items to be able to set the series text color to black.

I have created my ChartLegendCell.swift file based on the example and my ChartLegendCell.xib which has a UIView and a UILabel. I incorporate these into my code exactly as in the example. However the legend does not show up upon render. I added a breakpoint inside the ChartLegendCell.swift class and I see bindSeriesInfo method called twice per series. What I noticed is that the first time it is called, printing out self.bounds shows (0,0,230,35) which is correct, but the second time it is called self.bounds is (0,0,0,0).

Is there more code which needs to be added in the ChartLegendCell.swift to make sure the width and height aren’t 0?

  • Brad Taber asked 3 years ago
  • last active 2 years ago
0 votes

Hi, I want to set yaxis labels outside the chart but unable to find any solution please help.

1 vote

SciChart running on iOS 13.6

Please see this short video which demonstrates the issue:

I have a chart showing a single Spline data series. The data series never drops below zero, yet the chart shows multiple points where the line drops below zero as you zoom in and out. This behavior changes as the zoom level changes.

Is this expected behavior for the spline chart? Is there a way to change the behavior so the chart does not show these sub-zero points?

private func drawChart()

    let series = self.getPositionSeries( name: name, color: color, results: resultsSession.rearResults )


private func createChartSurface()
    // If we created a chart surface previously then we need to remove it from the superview

    // Create a SCIChartSurface. This is a UIView so can be added directly to the UI
    sciChartSurface = SCIChartSurface()
    sciChartSurface?.translatesAutoresizingMaskIntoConstraints = false

    //sciChartSurface?.autoresizingMask = [.flexibleHeight, .flexibleWidth] // chart bottom falls off the view without this
    sciChartSurface?.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor).isActive = true
    sciChartSurface?.bottomAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.bottomAnchor).isActive = true
    sciChartSurface?.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
    sciChartSurface?.rightAnchor.constraint(equalTo: self.view.rightAnchor).isActive = true

    // Create an XAxis and YAxis. This step is mandatory before creating series
    let xaxis = SCINumericAxis()
    xaxis.axisTitle = "Seconds"

    let yaxis = SCINumericAxis()
    yaxis.axisTitle = "Position (mm)"
    yaxis.axisId = "p" // position
    yaxis.axisAlignment = .right

    let yaxis = SCINumericAxis()
    yaxis.axisTitle = "Speed mm/s"
    yaxis.axisId = "s" // speed
    yaxis.axisAlignment = .left


private func getPositionSeries( name: String, color: UIColor, results: ResultData ) -> SCISplineLineRenderableSeries
    let positionData = SCIXyDataSeries(xType: .double, yType: .double)
    positionData.seriesName = name
    let start = resultsSession.indexStart + 1
    let last = resultsSession.indexEnd

    for index in start ... last {
        let t1 = resultsSession.sensorData[index-1].time
        let t2 = resultsSession.sensorData[index].time
        if ((t2-t1) == 1) {
            let x = Double(t2) / resultsSession.sampleRate
            let y = results.axleData[index].position
            positionData.append(x: x, y: y)
        } else {
            // There was a gap in the data.  Fill in the gap with a horizontal line.
            let y = results.axleData[index-1].position
            for tx in (t1 + 1) ... t2 {
                let x = Double(tx) / resultsSession.sampleRate
                positionData.append(x:x, y:y)

    let positionSeries = SCISplineLineRenderableSeries()  // SCIFastLineRenderableSeries()
    positionSeries.dataSeries = positionData
    positionSeries.yAxisId = "p"
    positionSeries.strokeStyle = SCISolidPenStyle(color: color, thickness: 1.0)
    return positionSeries
0 votes


I was overriding the performZoom(at mousePoint: CGPoint, xValue: Double, yValue: Double) method of SCIPinchZoomModifier but it is not accessible anymore.

My Code:

import Foundation
import SciChart

public class FixedToCenterPinchZoomModifier : SCIPinchZoomModifier {

override func performZoom(at mousePoint: CGPoint, xValue: Double, yValue: Double) {
    let middle = CGPoint(x: parentSurface?.frame.midX ?? 0,
                         y: parentSurface?.frame.midY ?? 0)
    super.performZoom(at: middle, xValue: xValue, yValue: yValue)


I get the error: Method does not override any method from its superclass

Is there a way to access the protected method?

0 votes


I’m trying to convert Java code to swift and I need the same CustomCategoryDateAxis class as Yura’s answer:

I try to inherit from SCICategoryDateAxis but there is no isZoomConstrainSatisfied and coerceVisibleRange overrides.

How can i write the same code in swift?


0 votes

Is the styleFor function of SCIPaletteProvider that was in Version 2.0 not implemented in Version 4.8?
Also, are there any plans to implement it?

I am upgrading from SciCharts 2.0.1 to SciCharts 4.3.
When the color was set using SCI Palatt Provider in Version 2.0, the memory used was 200M, but in Version 4.3, the memory used may consume as much as 1G.
I tried to devise it by setting the Sampleing Mode, but it is not very effective.

SCI Charts is used to display the spectrum data of audio data while playing the sound.

1 vote

I want to style one of the data point bars in a column chart to be a different color. Is there any way to do this?

  • doughill asked 6 years ago
  • last active 6 years ago
1 vote

We are using stacked bar chart, and showing only 6 bars visible at a time.
In the X-Axis, the month labels are missing for alternate months & only displays all month label as a flash when graph is being scrolled. Is there any way to fix this.

1 vote

I was trying to test SciChart on simulator, but I have a problem: I added chart surface on my view, and after I launch an app, SciChart is showing me this text on the screen :
“Hardware rendering performance of SciChart in simulator is SLOW. Please use an actual device to feel the real-world performance”
How do I remove this text and test my charts on the simulator?

Showing 1 - 50 of 291 results