Category: iOS

When I create a SCIChartSurface programmatically, following the Quick Start guide:
https://www.scichart.com/documentation/ios/current/creating-your-first-scichart-ios-app.html#adding-scichartsurface-purely-from-code

Functionally everything works as expected, but I see a series of these messages in the log:

   [CAMetalLayer nextDrawable] returning nil because allocation failed.

I do not see these messages when the SCIChartSurface is instantiated via a storyboard.

i want to implement a custom modifier to track the users touch, similar to rollover but without displaying a view

I tried to do this by implementing SCIGestureModifier and overriding all the onTouches methods, but – no matter the user behaviour – the modifier will always receive an onTouchesCancelled event after about a second and receive no more of these events after that.

What does work is implement onPanGesture to actually track all the user’s movement but i don’t see any way of how you would receive a touch up event this way (which i do need)

Is there any fundamental misunderstanding on how this should work on my side?

Hello everyone.
We are trying to migrate to V3 in our iOS project and we have many issues.
One of the most important is the implementation of vertically-draggable horizontal lines.
I have a nice working code for SCICharts V2 but I cannot find any similar example of how we can implement a custom modifier for moving an SCIHorizontalLineAnnotation vertically in V3.
We have done it already with the V2 but now that we have to migrate to V3 there is a huge missing part in your documentation.
Our code was using-overiding onPanGesture() in order to figure out if the modifier should handle the touching event, then we were using the touch point in order to find the closer horizontal lines and choose the closest one in order to change the vertical value depending on the touching-changing point.
The only similar example that I found in your documentation (https://www.scichart.com/example/ios-custom-modifier/) is using SCIGestureModifier which is not accesible by the V3.
I am trying to use your SCIChartModifierBase class but cannot find anywhere a similar example of what we need.
I already tried to understand how you want us to use the ” override func onEvent(_ args: SCIModifierEventArgs!) ” function of the
SCIChartModifierBase but still no luck, it is impossible to figure out without any kind of a similar example.
The reason of needing an example is that this task needs much more information like these:
1. How to decide if the modifier should handle the touch event and how it should be ignored or handled by the next modifier in the same group ?
2. How to handle the touch started, changed, cancelled events ?
3. How to say in realtime to other modifiers in the same group that we need to to handle the same event simultaneously with this custom modifier ?
4. How to say to the group of modifiers that after the first modifer is taken the touch event then the rest should not use it ?

I will paste here our current implementation that we have done for V2 and needs to be transformed to V3 in case you need more details.

An important part is how we add the modifiers on the chart and this is how we are doing it right now:
let zoom = SCIPinchZoomModifier()
zoom.direction = .xDirection
let group = SCIChartModifierCollection(collection: [CustomModifier(chart: self),
PanModifier(),
zoom])
//group.handleGestureFirstOnly = true // Not existing in V3 anymore ! How should we do it in V3 ?
chart.chartModifiers = group

I believe that this code will be really useful for many people out there even for V2 or for migrating to V3.

Swift iOs code using SCICharts V2:

class Modifier: SCIGestureModifier {
private weak var control: ChartView?
private var editingProperty: ChartView.BindableProperty?
private var calculator: SCICoordinateCalculatorProtocol?

    init(chart: ChartView?) {
        self.control = chart
    }

    override func onPanGesture(_ gesture: UIPanGestureRecognizer?, at view: UIView?) -> Bool {

        guard let chart = view as? SCIChartSurface,
            let gesture_ = gesture
            else { return super.onPanGesture(gesture, at: view) }

        let location = gesture_.location(in: chart)
        switch gesture_.state {
        case .began:
            control?.sendActions(for: .touchDown)
            editingProperty = testForDraggableLine(location: location, in: chart)
            calculator = yAxis().getCurrentCoordinateCalculator()
            if editingProperty != nil {
                // Annotations on SciChart don't have Zindex and we want current line to be on the top
                let draggableLines = control?.chart.annotations.array.compactMap { $0 as? DraggableLine }
                if let myLine = draggableLines?.first(where: { $0.bindingKeyValue == editingProperty }) {
                    control?.chart.annotations.remove(myLine)
                    control?.chart.annotations.add(myLine)
                }
                control?.isTouchingLine(isTouching: editingProperty != nil)
            }
            return editingProperty != nil
        case .changed:
            if editingProperty != nil {
                handleDraggingLines(location: location, in: chart)
                return true
            }
        case UIGestureRecognizer.State.ended:
            if editingProperty != nil {
                control?.sendActions(for: .editingDidEnd)
                editingProperty = nil
                _ = control?.adjustYRange(force: true)
                control?.sendActions(for: .valueChanged)
                control?.refreshPositions()
                control?.isNotTouchingLine()
                return true
            }
        case UIGestureRecognizer.State.cancelled:
            if editingProperty != nil {
                control?.sendActions(for: .editingDidEnd)
                editingProperty = nil
                _ = control?.adjustYRange(force: true)
                control?.sendActions(for: .valueChanged)
                control?.refreshPositions()
                control?.isNotTouchingLine()
                return true
            }
        default:
            break
        }

        return false
    }

    private func handleDraggingLines(location: CGPoint, in chart: SCIChartSurface) {
        guard let renderSurface = chart.renderSurface,
            let yCalculator = self.calculator,
            let editingProperty = editingProperty else { return }

        let pointInChart = renderSurface.point(inChartFrame: location)
        let valueForYAxis = yCalculator.getDataValue(from: Double(pointInChart.y))
        control?.setValue(Decimal(valueForYAxis), forKey: editingProperty.rawValue)
    }

    // SOS: Filter possible properties that can be returned. We want to always avoid return - and then - dragging the current price bid or ask !
    private func testForDraggableLine(location: CGPoint, in chart: SCIChartSurface) -> ChartView.BindableProperty? {
        let hitTestDistance: Double = 30 // Pixels !
        let nearItems = chart.annotations.array
            .compactMap { $0 as? DraggableLine }
            .filter { item in
                return item.bindingKeyValue != ChartView.BindableProperty.ask &&
                    item.bindingKeyValue != ChartView.BindableProperty.bid &&
                    !item.isHidden &&
                    item.yDistance(from: location) <= hitTestDistance
            }
        return nearItems
            .sorted { $0.yDistance(from: location) < $1.yDistance(from: location) }
            .first?.bindingKeyValue
    }
}

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() {
super.viewDidLoad()

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

self.view.addSubview(sciChartSurface!)


let xAxis = SCINumericAxis()
xAxis.growBy = SCIDoubleRange(min: SCIGeneric(0.1), max: SCIGeneric(0.1))
sciChartSurface?.xAxes.add(xAxis)

let yAxis = SCINumericAxis()
yAxis.growBy = SCIDoubleRange(min: SCIGeneric(0.1), max: SCIGeneric(0.1))
sciChartSurface?.yAxes.add(yAxis)

createRenderableSeries()
addModifiers()


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

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

}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)

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

}

override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)

if nil != timer{
  timer?.invalidate()
  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

sciChartSurface?.zoomExtents()
sciChartSurface?.invalidateElement()

}

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

sciChartSurface?.renderableSeries.add(lineRenderableSeries)
sciChartSurface?.renderableSeries.add(scatterRenderableSeries)

}

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")
  centralManager.scanForPeripherals(withServices:nil)
}

}

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

}
func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
print(“Connected!”)
maestroPeripheral.discoverServices([maestroServiceCBUUID])
}
}

extension HRMViewController:CBPeripheralDelegate{
func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
guard let services = peripheral.services else {return}
for service in services {
print(service)
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)
  if characteristic.properties.contains(.read){
    print("\(characteristic.uuid): properties contain .read")
  }
  if characteristic.properties.contains(.notify){
    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
createDataSeries(_brainwave2:wave)

  default:
  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])
}

}

}

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?

Hello,
I’m following along with the tutorial. I installed using the pod. I am at the end of Tutorial 3 and am getting an error. Use of unresolved Identifier ‘SciGeneric’. I can see I have the wrapper file in my project. Any Ideas what I’m doing wrong?

Thanks
Warren

Hi, guys

I have some data series like:

[[SCIXyDataSeries alloc] initWithXType:SCIDataType_DateTime
                                 YType:SCIDataType_Double
                             SeriesType:SCITypeOfDataSeries_XCategory];

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

When i try to run the simple Example from the Documentation ( with my trial License Key ) :

class AppDelegate: NSResponder, NSApplicationDelegate {
override init(){
// Set this code once in AppDelegate or application startup
SCIChartSurface.setRuntimeLicenseKey(“XXXXXX”);
super.init()

}

i receive this error and the application builds but fails to start :

libc++abi: terminating with uncaught exception of type NSException
*** Terminating app due to uncaught exception ‘License Exception’, reason: ”
terminating with uncaught exception of type NSException

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;

Hey guys,

Starting from 2.0 we can have dashed lines in renderable series. I was wondering can we have dashed line annotations as well?

I tried this:

verticalLineAnnotation.style.linePen = [[SCIPenDashed alloc] initWithColor:[UIColor redColor] width:2 withStrokeDashArray:@[@(10.f),@(3.f)]];

and got this build error:

Assigning to 'SCIPenStyle *' from incompatible type 'SCIPenDashed *'

Isn’t SCIPenDashed a SCIPenStyle?

Best,
Igor

yAxis.textFormatting = “%f”
First image file is the result of this code.

yAxis.textFormatting = “0.00000000”
Second image file is the result of this code.

First code doesn’t work, even it is just a sample code in document.
Second code works, but I want flexible trailing zeros.
How can I do?

I am trying to add a legend to my chart similar to how is done in the LegendChartView.swift code in the sample app. However the legend does not show and I get several NSLayoutConstraints conflicts such as this one:

[LayoutConstraints] Unable to simultaneously satisfy constraints.   Probably at least one of the constraints in the following list is one you don't want.   Try this:       (1) look at each constraint and try to figure out which you don't expect;       (2) find the code that added the unwanted constraint or constraints and fix it.  (
    "<NSLayoutConstraint:0x283528af0 UIButton:0x13c52d840.height == 25   (active)>",
    "<NSLayoutConstraint:0x2835285f0 UIButton:0x13c52d840.bottom == UIView:0x13c545060.bottom - 4   (active)>",
    "<NSLayoutConstraint:0x2835285a0 V:|-(4)-[UIButton:0x13c52d840]   (active, names: '|':UIView:0x13c545060 )>",
    "<NSLayoutConstraint:0x283528b40 'UIIBSystemGenerated' SCIDefaultLegendItem:0x13c543f90.top == UIView:0x13c545060.top   (active)>",
    "<NSLayoutConstraint:0x283528b90 'UIIBSystemGenerated' V:[UIView:0x13c545060]-(0)-|   (active, names: '|':SCIDefaultLegendItem:0x13c543f90 )>",
    "<NSLayoutConstraint:0x283529c20 'UIView-Encapsulated-Layout-Height' SCIDefaultLegendItem:0x13c543f90.height == 0   (active)>" )

Will attempt to recover by breaking constraint  <NSLayoutConstraint:0x283528af0 UIButton:0x13c52d840.height == 25   (active)>

The internal SCIDefaultLegendItems look to keep setting their width and height to 0 which causes conflicts with the underlying UIButton and UILabel components.

Any thoughts on how to get around this? My chart has four series. I have seen the article on drawing the legend outside the chart surface area however I do not want to do that.

Thank you!

Hey everyone, my team currently has Scicharts for WPF set up and functioning the way we want it too.

We are moving to Xamarin and have tested Scicharts in a Xamarin.Forms project working for Android/iOS and Windows WPF.
The next step was to install Visual Studios for Mac, and setup a new Xamarin.Forms project and pull the code from the windows version of our Xamarin.Forms project. For windows we use a custom renderer to get the scicharts to work for all platforms available on the windows version. For Mac, we are trying to get a custom renderer set up to load the swift version of the Scicharts for Mac. It’s not going so well.

Can anyone provide details on if it’s possible to get a xaramarin.forms project to load the scicharts for mac framework?

Thanks

NOTE** I picked iOS because for some reason MacOS wasn’t in the list of platforms

Hello

Is it possible do detect taps/selection/click over Axis Titles?

Thanks!

Hi, guys

Is there possibility to show tooltip by simply changing switch at the settings?
Not by tapping at the chart area as it implemented now.

Best regards,
Sushynski Andrei

I would like to restrict the chart to cap at the extents while panning, but chart stretches at the extents. I could able to set clip mode for X axis in SCIZoomPanModifier, same way I would like to set clip mode Y axis but I couldn’t.

Please help me to restrict my chart to not move after chart data extents.

Thanks,
Vadivel Muniswamy.

It seems most of the modifiers bring up tooltip data with a pan, and then it goes away when the user lifts their finger. Is there any way to bring up tooltip data with a tap (and does not go away when the finger has lifted)? The main problem that we’re trying to solve is that we would like to be able to pan to look at the chart (and don’t want an axis pan), but would also like to bring up tooltip data.

I’m trying to make a chart with a “toggle function”.

The “toggle function” what i wanted to make is this.

1. enter to UIViewController which Chart is in it
2. before singleTap on a chart, a chart has zoomPanModifier, XAxisDragModifier,, etc
3. after make singleTap on the chart, that chart has only CursorModifier.
4. CursorModifier’s UI stays on chart without disappearing and i can move crossed line to specific point i want (just like what CursorModifier originally does)
5. another single tap on chart would make a chart to have all other modifiers but CursorModifer.

–

What I have made successfully was 1,2,3,5 . not 4.

The way i was going to solve this problem was make fake touch event on Chart view and
snatch UIGestureRecognizer Event and let ChartView think they’re being touched till I give stop signal

But I heard that there is no more way to pass fake touch to UIView.

So I’m feeling difficulty on this problem…..

is there any easy way to solve this problem?

–

TL;DR;

I WANT TO MAKE CURSORMODIFIER’ UI STAYS ON A CHART!

+)
(lldb) po SciChartVersionNumber
0x3ff0000000000000

(lldb) po SciChartVersionString
0x474f525029232840

I wanted to know what version I’m using.. but i couldn’t know… what version am i using..?

I’m trying to create a Modifier for a PieChart Surface. I can not figure out how to get a segment for a point on the screen. With SciChartSurface, you can get the axis, and use its calculator to get a datapoint, or pixel point. Is there something similar in SciPieChartSurface?

I want to develop a rollover in my IOS application, like the example of Using RolloverModifier. However, the axis label & tooltip display of rollover in this example is static, I want to customize a the the label & tooltip that I want, .xib file or coding to develop also fine.

Can anyone help or give suggestions to my problems? Thanks.

When i try to add SCITextAnnotation and text color is white, a gray outline appears around the symbol (triangle).
How can I turn it off or change the color?

The website has changed recently. I do not see any way to locate my existing support tickets. When I click on Developers–>Support it only gives me the option to create a new ticket.

Hey everyone,

SCIThemeColorProvider has styling properties for individual types of chart elements (annotations, axes, grid lines, renderable series). How can multiple colours be assigned to individual RenderableSeries in case there are more than one?

For example, a stacked column chart will surely have more that one data series and it appears that current implementation of SCIThemeColorProvider doesn’t take this into account from architectural point of view.

Am I missing something?

Thanks,
Igor

registerVisibleRangeChangedCallback is not enough for me.
I want an active stop function like this.
surface.stopScroll()….

Hey again!

Is there kind of a delegate that notify me if the user uses the crosshair/SCIRolloverModifier?
I want to know which value he is inspecting to show him further information outside the chart for this datapoint.

Thanks and Greeting
Benedikt

Hi,

There is a strange displaying behavior of custom annotation. I added custom annotation using the code below.

let imageView = UIImageView(image: UIImage(named: imageName))
imageView.frame = CGRect(origin: .zero, size: CGSize(width: 10, height: 10))

let customAnnotation = SCICustomAnnotation()
customAnnotation.customView = imageView
customAnnotation.verticalAnchorPoint = .bottom
customAnnotation.horizontalAnchorPoint = .center
customAnnotation.set(x1: xCoordinate)
customAnnotation.set(y1: yCoordinate)
sciChartSurface?.annotations.add(items: customAnnotation)

The result looks good, but when I move surface left and right, custom annotation would go outside of bounds. Like the image I uploaded.

Please help me solve the issue.

Thanks.

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!
Alex

Hi there.

It’s has been asked here:
https://www.scichart.com/questions/question/custom-annotation

So, Is it possible to draw dashed line annotation at the current version 1.2.3.982?

Best regards,
Sushynski Andrei

I’ve downloaded yesterday showcase example from your github: https://github.com/ABTSoftware/SciChart.iOS.Examples

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:]
cblas_sscal

Tested using:
iPhone 5SE
iOS 11.2.5
Xcode 9.2

Hello,
I managed to implement a chart legend with a custom datasource (using just a SCIChartLegend object as a subview, not SCILegendModifier). However, I am unable to place the legend at specified position, it always snaps to upper-left corner of the screen. When creating a SCIChartLegend instance using the initializer that takes a Rect as a parameter, but not supplying a custom datasource, it draws correctly according to offsets specified by the supplied rect’s X and Y. It does respond to changes in the legendPosition property, but it still doesn’t allow to draw the view with any margins (which is what I’m actually trying to achieve).

Hello.
We updated scichart to 2.5.0 version and got issue:
We have SCIAxisMarkerAnnotation with market line and set markerLinePen:

let mainDashPattern: [NSNumber] = [1.1, 1.0, 1.1, 1.0]
style.markerLinePen = SCISolidPenStyle(color: mainBlack15, withThickness: 1.0, andStrokeDash: mainDashPattern)

Sometimes, after create new chart, all lines with strokeDash colored with solid black color.

I added screenshots.

Thanks,
Alexey.