CorePlot - unable to zoom using 2 plot spaces - zooming

Question

I have 2 scatter plots in a single plot. Both the plots have the same x-axis but the y scale is different. So I have created a new plot space.
CPTGraph *graph = self.hostView.hostedGraph;
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
CPTXYPlotSpace *newPlotSpace = (CPTXYPlotSpace *) graph.newPlotSpace;
newPlotSpace.identifier = #"Fund PlotSpace";
[graph addPlotSpace:newPlotSpace];
// 2 - Create the two plots
CPTScatterPlot *aaplPlot = [[CPTScatterPlot alloc] init];
aaplPlot.delegate = self;
[graph addPlot:aaplPlot toPlotSpace:plotSpace];
CPTScatterPlot *fdPlot = [[CPTScatterPlot alloc] init];
fundingPlot.delegate = self;
[graph addPlot:fdPlot toPlotSpace:newPlotSpace];
I also have enabled user interaction
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = YES;
CPTXYPlotSpace *newPlotSpace = (CPTXYPlotSpace *) graph.newPlotSpace;
newPlotSpace.allowsUserInteraction = YES;
I have also done this
self.hostView = [(CPTGraphHostingView *) [CPTGraphHostingView alloc] initWithFrame:self.view.bounds];
self.hostView.allowPinchScaling = YES;
[self.view addSubview:self.hostView];
But the second plot does not zoom. I am unable to understand why.
Edit
Here is my full code

Answer 1

You're creating two new plot spaces but only adding one to the graph. The one with user interaction enabled in -configureGraph is different from the one created in -configurePlots and added to the graph.
The -newPlotSpace method creates a new plot space object for you. In -configureGraph, give it an identifier and add it to the graph (move those lines from -configurePlots). When you need to refer to it later (e.g., in -configurePlots), do this:
CPTXYPlotSpace *newPlotSpace = (CPTXYPlotSpace *)[graph plotSpaceWithIdentifier:#"Fd Plot Space"];