This should eliminate the extra white space:

stackedColSeries.xAxis.labelsVisible = NO;
stackedColSeries.xAxis.extent = 0;

stackedColSeries.yAxis.labelsVisible = NO;
stackedColSeries.yAxis.extent = 0; 

I'm not sure if you've tried this already, but the code above hides the extra pair of axes you've created for the second series.

Actually, my main aim here is to get the column series and stacked series to overlap and not be side by side.

You can see the image attached to see the final output that we are trying to create.

Also in the image on the right you can see the actual output we are getting from the code.

The data that we have for the column series and stacked series share the same X-Axis data points.

When we are creating the series using same Xaxis and Yaxis the resulting chart created shows the series side by side. (The chart is laid out properly without any unnecessary blank space between labels and YAxis)

But when using the separate XAxis and Yaxis we are able to get the overlapping series that we are acutally looking for. But the chart created has unnecessary blank space between labels and YAxis.

P.S. The error that we mentioned above was error of duplicated keys for axis. we have solved that error.

When you have multiple axes in the same location, they get stacked. For example, you have added 2 different Y axes. By default they will be placed on the left side and will have an extent. You can set extent to 0 on your yAxis1 or make it invisible to reclaim the space. Note, that your column series will not be displayed side by side with the stacked series, because they use two different X axes. I don't know why you're getting errors when you use the same axes for both series. Can you post the error message? If you get a generic error, perhaps the console output will show a more detailed message.

Hi Max,

thanks for reply,  i tried your given suggestion & got solution upto certain extend but i stuck on a following issue... 

i tried your code this way....

IGCategorySeriesDataSourceHelper *source = [[IGCategorySeriesDataSourceHelper alloc] init];

        source.data = data;    

        source.valuePath = @"cost";

        source.labelPath = @"product";

        infraChart = [[IGChartView alloc] initWithFrame:CGRectMake(0, 10, 295, 171)];

        [infraChart setAutoresizingMask:UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight];

        infraChart.delegate = self;

        IGCategoryXAxis *xAxis = [[IGCategoryXAxis alloc] initWithKey:@"xAxis"];

        IGNumericYAxis *yAxis = [[IGNumericYAxis alloc] initWithKey:@"yAxis"];

        [infraChart addAxis:xAxis];

        [infraChart addAxis:yAxis];

        IGColumnSeries *colSeries = (IGColumnSeries *) [infraChart addSeriesForType:[IGColumnSeries class] usingKey:@"series" withDataSource:source firstAxisKey:@"xAxis" secondAxisKey:@"yAxis"];

        IGStackedSeriesDataSourceHelper* stackedChartDataSourceHelper = [[IGStackedSeriesDataSourceHelper alloc]initWithData:arrStackedBarSeries fields:[[NSArray alloc]initWithObjects: @"sales", @"pending", nil]];

        IGStackedColumnSeries *stackedColSeries = (IGStackedColumnSeries *) [infraChart addStackedSeriesForType:[IGStackedColumnSeries class] usingKey:@"series2" withDataSource:stackedChartDataSourceHelper firstAxisKey:@"xAxis1" secondAxisKey:@"yAxis1"];

        colSeries.xAxis.gap = 0.7;

        IGChartThemeDefinition *def = [IGChartDefaultThemes DefaultTheme];

        infraChart.theme = def;

        [goalSalesChart addSubview:infraChart];

& i got solution upto this .....

https://ramjansayyad.opendrive.com/files?Nl8zMDc0MTM1MV9hWVF3ag

But

if you see above screen shot here, I'm getting too much space between graph & it's Y-axis.

& I'm unable to reduce it.

Also,

In your solution you pass xAxis & yAxis same for IGColumnSeries & IGStackedColumnSeries ...but if i go with the same my code gets break so i pass (xAxis,yAxis) for IGColumnSeries &  (xAxis1,yAxis1) for IGStackedColumnSeries ....

So please ,if you help me to get out of this issue that will be so glad.....