Category: iOS

Hello,
I would like to place a title for an X axis to the right of axis labels. I am easily able to achieve this on Android (see attached screenshot), but I cannot find relevant properties (axisTitlePlacement etc.) in iOS version of SciChart.

In the last section of this article in documentation you write that it is possible, however the links are dead (and frankly, the method names look suspiciously Java-ish to me).

Hello, I’m trailing your library right now. I would like to be able to move the graph around as well as a cursor on the graph. So I enabled both SCIZoomPanModifier and SCICursorModifier. But since both use one finger panning, the result wasn’t that good. Do you have any guidance for solving the conflict and letting them working together? I’m thinking to do it in the following way: if the touch location is within certain pixel range of the cursor, panning action will move the cursor, otherwise it moves the graph. Is it possible? Thanks

Hello, I’m trailing your library right now. I’m wondering how to change the background color of the legend box. The document page for LegendModifier shows coming soon. I don’t see such option in LegendModifier definition in Xcode either. Thanks

Andrew required swift code so I attach the code.
Please answer my question again.

https://www.scichart.com/questions/question/customize-chart-designwith-pic
https://www.scichart.com/questions/question/cannnot-remove-weird-square-areas

Andrew answered second question, but it didn’t work.
There is no drawAxisBands.

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

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 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?

When scrolling, some weird bold lines appear and disappear.
You can see it on image files attached.
How can i fix it?

How would I go about doing this in swift?

Have recently converted to xcode 10 and swift 4.2.

Am now receiving this error message on build.

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

Any ideas?

Hi Sir/Madam,
I have created a Mountain Series with gradient fill. below is part of my code:

-(SCIRenderableSeriesBase *)getTimeSharePlot:(SCIXyDataSeries*)xySeries{
    SCIFastMountainRenderableSeries * rSeries = [SCIFastMountainRenderableSeries new];
    rSeries.dataSeries = xySeries;
    rSeries.strokeStyle = [[SCISolidPenStyle alloc] initWithColor:[UIColor colorWithRed:0 green:0 blue:0 alpha:1] withThickness:1];
    rSeries.areaStyle = [[SCILinearGradientBrushStyle alloc] initWithColorStart:[UIColor colorWithRed:32/255.0 green:56/255.0 blue:124/255.0 alpha:1.0] finish:[UIColor whiteColor] direction:SCILinearGradientDirection_Vertical];

    return rSeries;
}

When i run the test, the chart is just filling with solid color
Would you please help?
BR,
Tommy

Hi

I am developing a Xamarin iOS application and I’m using a SCIPieChartSurface. I can create the chart and set its values, but it 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’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..?

Hi

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
Jonas

Hi,
Im tryin to create an effect where I have a static point on the Y Axis and I want to perform zoom in, so what I did is to increase or decrease the Max visible range, what I’m left with is the rubber band effect where my static point isn’t static anymore because the point in “Stretching” in the direction I’m zooming.

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])
}

}

}

Hi,
we are using an UICollectionView to display different kinds of views in our application, including charts created with SciChart. We noted that every time a cell with a SciChart is loaded, some memory is allocated and not freed when the cell disappears, which leads to a massive memory leak and eventually crashes the application.
Is there a way to free SciChart resources on demand? Or maybe you suggest another solution to solve this issue?
Regards,
Anna

When there are 2 or more horizontal/vertical axis, how to hide the cursor label for specific axis?

Hello,

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..

use_frameworks!

pod 'UICircularProgressRing'
pod 'Alamofire'

platform :ios, '8.0'
source 'https://github.com/CocoaPods/Specs.git'

pod 'SideMenu'

source 'https://github.com/ABTSoftware/PodSpecs.git'
pod 'SciChart', :git => 'https://github.com/ABTSoftware/PodSpecs.git'

Hi,
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
    pre.style.fillBrush = SCISolidBrushStyle(color: #colorLiteral(red: 0.01680417731, green: 0.1983509958, blue: 1, alpha: 0.13))
    pre.style.borderPen = SCISolidPenStyle(color: .clear, withThickness: 0)

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

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.

I need someone to develop this chart for me and I will provide a JSON, for the data.

https://www.youtube.com/watch?v=t29Zl-7QyMw&t=215s
Please go to time line 3:22

I have been struggling in the documentation and if someone can create this chart for me, I will be more than happy to pay you.

The chart would have to be created for Swift 4 please.

Robert

I have a Xamarin forms Project with one page of my app containing a SciChart. On that page, I have a RelativeLayout.

In the code behind for that page, I pass my layout to a dependency service method which adds the SciChartSurface to it depending on the platform. This has tested well on various Android platforms.

For iOS, I’ve tested on a device running iOS 9 and simulators running 9, 10, and 11. And any run less than 11 does not display. The view is simply blank.

Here’s the code where I add the SciChartSurface to the view.. I’m still new to SciChart, so I’m not sure if I’m doing everything totally correct.

public void renderSciChart(Xamarin.Forms.RelativeLayout masterLayout, Xamarin.Forms.RelativeLayout topLayout)
    {


        SciChart.iOS.Charting.SCIChartSurface Surface = new SciChart.iOS.Charting.SCIChartSurface();
        Surface.TranslatesAutoresizingMaskIntoConstraints = true;
        SciChart.iOS.Charting.XyDataSeries<double, double> dataSeries = new SciChart.iOS.Charting.XyDataSeries<double, double>();
        //generateDataPoints(dataSeries);
        var xAxis = new SciChart.iOS.Charting.SCINumericAxis{/*GrowBy = new SciChart.iOS.Charting.SCIDoubleRange(0.1, 0.1), VisibleRange = new SciChart.iOS.Charting.SCIDoubleRange(1.1,2.7)*/};
        var yAxis = new SciChart.iOS.Charting.SCINumericAxis();
        var renderableSeries = new SciChart.iOS.Charting.SCIFastLineRenderableSeries { DataSeries = dataSeries, StrokeStyle = new SciChart.iOS.Charting.SCISolidPenStyle(0xFF279B27, 2f) };
        using (Surface.SuspendUpdates())
        {
            Surface.XAxes.Add(xAxis);
            Surface.YAxes.Add(yAxis);
            Surface.RenderableSeries.Add(renderableSeries);
            Surface.ChartModifiers = new SciChart.iOS.Charting.SCIChartModifierCollection
            {
                new SciChart.iOS.Charting.SCIZoomPanModifier(),
                new SciChart.iOS.Charting.SCIPinchZoomModifier(),
                new SciChart.iOS.Charting.SCIZoomExtentsModifier(),
            };
        }

        masterLayout.Children.Add(Surface.ToView(),
        widthConstraint: Constraint.RelativeToParent(parent => parent.Width),
        heightConstraint: Constraint.RelativeToParent(parent => parent.Height * 0.5),
        yConstraint: Constraint.RelativeToView(topLayout, (RelativeLayout, element) => element.Height));
    }

Additionally, here’s a Screenshot of the same code running on a simulator with iOS 10 (Left) and iOS 11 (Right).

Could I have a date please.

is it possible for the December or more likely for January?
robert

https://www.scichart.com/documentation/ios/v2.x/Tutorial%2002%20-%20Creating%20a%20SciChartSurface.html

Can someone please point me to where I can complete this tutorial.

Why end this tutorial like this??

// That’s it! The SCIChartSurface will now display on the screen with default axis ranges

As is, it simply displays the x and y values. Nothing else.

How can I add my x and y values so that I can display my graph