Category: iOS

Hello,

I am trying to round the corners of the bars produced by a SCIFastImpulseRenderableSeries (pointMarker is hidden). Any suggestions how to do that?

Thanks!

Hi,

I am using SciChart_iOS_SDK_3.0.0.5074 with Swift 5.

I want to show string type on X-axis. I am using below code snippet.

class YearsLabelProvider: SCILabelProviderBase<SCINumericAxis> {

   var xLabels: [String] = ["Test", "Test", "Test", "Test", "Test", "Test", "Test", "Test",     "Test", "Test", "Test", "Test", "Test", "Test"]

   func update(_ axis: ISCIAxisCore!) { }

   override func formatLabel(_ dataValue: ISCIComparable!) -> ISCIString! {
        let index = Int(dataValue.toDouble())
        return NSString(string: index >= 0 && index < xLabels.count ? xLabels[index] : "")
    }

    override func formatCursorLabel(_ dataValue: ISCIComparable!) -> ISCIString! {
        let index = Int(dataValue.toDouble())

        var result: String?

        if (index >= 0 && index < xLabels.count) {
            result = xLabels[index]
        }
        return NSString(string: result!)
    }
}

Application crashes while loading with the following error –

” *** Terminating app due to uncaught exception ‘Initializer not allowed Exception’, reason: ‘Parameterless initializer of Chart.YearsLabelProvider class shouldn’t be used. Please use one of the designated initializers instead'”

Kindly help us resolving this issue since this is a showstopper issue.
I would also like to know about what data SCIXyDataSeries accepts when we are working with strings.

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

Hi all,

When we enable the rollover modifier and drag the chart, we can see the tooltip.
However, when I release the finger, the tooltip also disappears.
Is there a way to keep the tooltip showing when releasing the finger?
The problem we want to solve is user will use their finger to mark a critical point, then we will take a screenshot of the chart to generate a report.
Not sure if there is any good way to make the tooltip keeps showing to achieve this requirement?
Thanks

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

I have a question about an apparent regression/change from v2 to v4.

My chart uses an SCIHorizontallyStackedColumnsCollection with three SCIStackedColumnRenderableSeries instances. One of those is assigned to the right-hand Y axis, and the other two are assigned to the left-hand Y axis. Left and right Y axes have very different ranges.

In v2, each series in the group honored its assigned axis. In v4, each series is using the scale of the left-hand Y axis. This happens regardless of the order I add the renderable series to the columns collection.

In the example below, the magenta, blue, and yellow bars have a range of -2 to 2, and are assigned to the left-hand axis. The green bars have a range of 0 to 30 and are assigned to the right-hand axis. I expect all 4 bars to be displayed using the full vertical range of the chart, but instead everything is using the left-hand axis, and the non-green bars have very little displacement.

This is a change in behavior from v2 to v4. Is it intentional? Is there an easy workaround?

I tried to hack around it by having two different SCIStackedColumnRenderableSeries instances, one with 3 placeholder series/1 real series (RH axis) and the other with 1 placeholder/3 real series (LH axis). That doesn’t help. If there are two different column collections on the chart, they both use the left-hand axis, regardless of the order that they are added.

Minimal repro case is attached. But the crux is at the end. If I comment out the .add(rightStacks) call, I get desired behavior for the stack assigned to the left axis. If I comment out the .add(leftStacks), I get desired behavior for the stack assigned to the right axis. What I want is the chart I’d get by overlaying the second and third screenshots, but with the 0 point of left and right Y axis aligned.

    let rightStacks = SCIHorizontallyStackedColumnsCollection()
    rightStacks.add(rsRightPlaceholder1)
    rightStacks.add(rsRightPlaceholder2)
    rightStacks.add(rsRightPlaceholder3)
    rightStacks.add(rsRight)
    surface.renderableSeries.add(rightStacks)

    let leftStacks = SCIHorizontallyStackedColumnsCollection()
    leftStacks.add(rsLeftSine)
    leftStacks.add(rsLeftSingle)
    leftStacks.add(rsLeftDouble)
    leftStacks.add(rsLeftPlaceholder)
    surface.renderableSeries.add(leftStacks)

Edit

I think I’ve found the cause.

If I manually set (at line 46) yAxisLeft.axisId = “yAxisMyLeft”, then when I render, I get this in the console log:

2021-03-10 16:02:07.993233-0800 SciChart POC[86749:4815412] [WARNING] – [Render Warnings] Could not draw a renderable series of type SCIHorizontallyStackedColumnsCollection. YAxis with Id == DefaultAxisId doesn’t exist. Please ensure that the YAxisId property is set to a valid value.

2021-03-10 16:02:08.509648-0800 SciChart POC[86749:4815412] [WARNING] – [Render Warnings] Could not draw a renderable series of type SCIHorizontallyStackedColumnsCollection. YAxis with Id == DefaultAxisId doesn’t exist. Please ensure that the YAxisId property is set to a valid value.

I conclude from this behavior that SCIHorizontallyStackedColumnsCollection is hardwired to the default axis internally, regardless of the settings of the collection members.

How can I hide the default segment value label drawn automatically?
I need the solution for both iOS and Android version.

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.

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 ?

I have followed the example at: https://www.scichart.com/documentation/ios/current/legend-modifier.html 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?

I was testing my charts on a simulator and when I naved away and then back to the chart screen the Simulator’s chart was totally black screen; I could move the mouse over the points and the popouts would occur; and your license notice showed in the center of the chart. So it was almost like it thought all the drawing for the chart itself needed to be black on black.

It was always broken on the 2nd or later chart. Restarting the app fixed it. I tried removing all custom settings, and calling the invalidate; and nothing caused it to redraw correctly… Fortunately, when deploying to real devices everything worked correctly. Is this an expected side effect of testing on a simulator, or is their something that I can do to force a hard refresh of the chart…

FYI: The additional debug diagnostics don’t seem to do anything on a simulator, or at least I couldn’t find anywhere it was logged.

Hi, guys

My x axis is SCICategoryDateTimeAxis and i’m want to draw grid line with custom period. Let’s say every four hours for data with a period of thirty minutes. What is the best way for that?

Can i redifined axis’s tickCoordinatesProvider?
Can you provide some example?
Or it only possible with axes annotations ?

Best regards,
Sushynski Andrei

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

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.

Hi guys,

I want to show x value on chart bar itself as shown in the attached image along with this query. I tried using annotation where I need to give x and y value each time and it look not appropriate in the 2 data series column chart using, instead of that I need easy way to represent label of bar value on graph bar.

please suggest if any.

Thanks in advance.

Hi,

Using the ZoomExtentsModifier on multiple axis used to work in an earlier version of SciCharts, but is broken in 4.3.0. I have two y-axes set up, left and right on my chart, with the right-hand-side just mirroring the left. When I double-tap to zoom to the x/y range of the graph, only the x range is modified. If I disable the change listener that mirrors the range change on the primary y axis, double tap works as expected, but my right hand side y-axis no longer mirrors the primary axis range. This is how I’ve set up the dual axes:

        let yAxis = SCINumericAxis()
        yAxis.axisTitle = "Acceleration (g)"
        yAxis.axisAlignment = .left
        yAxis.visibleRangeLimitMode = .minMax
        chart?.yAxes.add( yAxis )

        // Add an additional visible yAxis to the right without label
        let yAxisRight = SCINumericAxis()
        yAxisRight.axisAlignment = .right
        yAxisRight.axisId = "yAxisRight"
        chart?.yAxes.add( yAxisRight )

        // Sync values with left (primary) axis
        yAxis.visibleRangeChangeListener = { (axis, oldRange, newRange, isAnimating) in
            yAxisRight.visibleRange = newRange
        }

Commenting out the listener at the bottom fixes the ZoomExtentsModifier problem, but is obviously not a workable solution. Any help would be appreciated. Thanks

I am using SciChart to create mountain chart. Now I want to change whole dataset when some button is clicked. So I am updating the dataset and calling invalidateElement on ScichartSurface. It is not animating while redrawing itself. First time it is animating.

@objc func changeDataValue() {
    if isFirstDataSet {
        for i in 0 ..< yValues3.count {
        ds1.update(at: Int32(i), x: SCIGeneric(i), y: SCIGeneric(yValues3[i]))
        ds2.update(at: Int32(i), x: SCIGeneric(i), y: SCIGeneric(yValues4[i]))
        }
    } else {
        for i in 0 ..< yValues1.count {
            ds1.update(at: Int32(i), x: SCIGeneric(i), y: SCIGeneric(yValues1[i]))
            ds2.update(at: Int32(i), x: SCIGeneric(i), y: SCIGeneric(yValues2[i]))
        }
    }
    isFirstDataSet = !isFirstDataSet
    sciChartSurface.invalidateElement()

    sciChartSurface.zoomExtents()

}

Code to add ScichartSurface is

  private func configureChartSurface() {
    sciChartSurface = SCIChartSurface(frame: view.bounds)
    sciChartSurface.autoresizingMask = [.flexibleWidth, .flexibleHeight]
    sciChartSurface.translatesAutoresizingMaskIntoConstraints = true
    view.addSubview(sciChartSurface)

    for i in 0..<yValues1.count {
        ds1.appendX(SCIGeneric(i), y: SCIGeneric(yValues1[i]))
        ds2.appendX(SCIGeneric(i), y: SCIGeneric(yValues2[i]))
    }

    let rSeries1 = SCIStackedMountainRenderableSeries()
    rSeries1.dataSeries = ds1
    rSeries1.strokeStyle = SCISolidPenStyle(colorCode: 0xFFffffff, withThickness: 1)
    rSeries1.areaStyle = SCILinearGradientBrushStyle(colorCodeStart: 0xDDDBE0E1, finish: 0x88B6C1C3, direction: .vertical)

    let rSeries2 = SCIStackedMountainRenderableSeries()
    rSeries2.dataSeries = ds2
    rSeries2.strokeStyle = SCISolidPenStyle(colorCode: 0xFFffffff, withThickness: 1)
    rSeries2.areaStyle = SCILinearGradientBrushStyle(colorCodeStart: 0xDDACBCCA, finish: 0x88439AAF, direction: .vertical)

    seriesCollection.add(rSeries1)
    seriesCollection.add(rSeries2)
    self.sciChartSurface.xAxes.add(SCINumericAxis())
    self.sciChartSurface.yAxes.add(SCINumericAxis())
    self.sciChartSurface.renderableSeries.add(self.seriesCollection)
    self.sciChartSurface.chartModifiers = SCIChartModifierCollection(childModifiers: [SCITooltipModifier()])
     self.seriesCollection.addAnimation(SCIWaveRenderableSeriesAnimation(duration: 3, curveAnimation: .easeOut))
    }

Hi, guys

it seems that i had found a mistake:

At SCICursorModifierStyle class if i try to set up axisVerticalTooltipCornerRadius property it lead to changing of axisHorizontalTooltipCornerRadius

Please take a look

Best regards,
Sushynski Andrei

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

Hi, guys

Is Stacked Columns support autoRange by visible range?

I’m interesting in because sometimes my data looks like at the screenshot “huge_data.png”

And even when i have scrolled outside this data it’s looks like at the screenshot “scrolled_outside.png”

Best regards,
Sushynski Andrei

I am trying to zoom and pan the line graph in my macOS app the zoom is working but I am not able to pan through the zoomed graph its not at all scrolling and also I wanted to know how can I add click event on the graph so that I can display some more data on click at a particular coordinate apart from tooth. I have shared my view controller. I will really appreciate any help as I have spend a lot of time figure this out and have no clue where to go from here.

Hello,

We have an app where we need to specify a different width for each column. I have attached an image of the result we want. We are currently using “SCIFastColumnRenderableSeries” for the diagram, but all columns have a fixed width and I couldn’t find any way to modify it.

Do you have any suggestions how to accomplish this?

Thanks!

So I want to draw multiple charts so is there any way I can have stacked yAxes like yAxis 2 should be drawn below yAxis1. I have gone through your example and there I got that we can add multiple surface but its becoming difficult for us to show a crosshair on all surfaces since we have a custom cross hair. Can you guide on same. Thanks in advance

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

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

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

I’m trying to accomplish 2 things:

First is that I would like to not be able to zoom out past the data, it does no good to zoom out if there is no more data to see. It would also be nice to have a little bounce/spring back if you zoom to far, like when zooming out on an image on an iPhone.

The second is that I only want to be able to pan to the data. If zoomed all the way out, then trying to pan would do nothing. If zoomed in you should be able to scroll around, but only to the end of the data.

I believe I have the first one accomplished by setting the maximalZoomContrain to be the same as the data range, although this doesn’t allow any kind of bounce.

What need to be done to make this work, this seems like a feature that is built into the SciChart Modifiers.