Or, to make it even more general (because you might actually want to pass nil to a method), why not simply get the count of arguments from the method signature?

Pleas keep up the good work.

Just re-read the tutorial – it is GREAT! Thanks for this wonderful deciphering of CorePlot.

thanks in advance

I was also trying this…i’m stuck on how to initialise the scatter plot with the data sources.

In the view controller we declare 2 arrays, yet when we initialise the plot, we have to pass a single data source which will be assigned to graphData. This is used as the data source for the numberOfRecordsForPlot and numberForPlot methods.

As such, how do we pass the 2 arrays to the scatter plot instance when we initialise it. Below is the code for the arrays

- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];

NSMutableArray *data = [NSMutableArray array];
[data addObject:[NSValue valueWithCGPoint:CGPointMake(2, 4)]];
[data addObject:[NSValue valueWithCGPoint:CGPointMake(4, 16)]];
[data addObject:[NSValue valueWithCGPoint:CGPointMake(6, 36)]];

NSMutableArray *data2 = [NSMutableArray array];
[data2 addObject:[NSValue valueWithCGPoint:CGPointMake(0, 100)]];
[data2 addObject:[NSValue valueWithCGPoint:CGPointMake(2, 80)]];
[data2 addObject:[NSValue valueWithCGPoint:CGPointMake(4, 60)]];

self.scatterPlot = [[TUTSimpleScatterPlot alloc] initWithHostingView:_graphHostingView andData:data];
[self.scatterPlot initialisePlot];
}

I’m not sure how we will pass the 2 data sources.

Thanks.

Thank you for your post, I found it to be very useful.
Just a doubt here, your code for the allocWithZone overriding is:

// We don’t want to allocate a new instance, so return the current one.
+ (id)allocWithZone:(NSZone*)zone {
return [[self sharedInstance] retain];
}

If sharedInstance is a static variable not bout to the class implementation (proof of that is you can declare it inside or outside the @implementation section), why use self? And, most important yet, why call retain on sharedInstance, since you also override the retain method to do nothing and just return self?

Would love to hear about how you fixed the IB Issue. I’ll edit the post above with some ‘tips and tricks’ based on the comments section – as there are quite a few comments to read through now for someone looking for a fix.

If you’re still having problems, feel free to send a zip of the project over to me (assuming it’s just a test project, and not an actual working / commercial project) and I’ll see if I can figure it out. Sometimes I just need the debugger to figure out what the problem is! My email is john -AT- johnwordsworth.com.

Just to confirm – are you use ARC? I’ve not yet made the move across to ARC and I’m aware that there are some changes required to make it work properly with ARC. I aim to put up an alternative version of the code over the XMas break and will include your fix at that time.

Thanks for the comment and the kind words. All the best with your CorePlot endeavours!