How do I Animate this

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C

Objective-C

I implemented corePlot in my xcode project. I have a pie chart that I'm trying to animate. Here is my code:

CPTGraph *graph = self.hostView.hostedGraph;

CPTPieChart *pieChart = [[CPTPieChart alloc] init];
pieChart.dataSource = self;
pieChart.delegate = self;
pieChart.pieRadius = (self.hostView.bounds.size.height * 0.7) / 2;
pieChart.startAngle = M_PI_4;
pieChart.sliceDirection = CPTPieDirectionClockwise;

[graph addPlot:pieChart];

This is what I tried:

[CPTAnimation animate:pieChart property:@"startAngle" from:pieChart.startAngle to:pieChart.endAngle duration:1.0];

That didn't have the desired effect. The chart would show for a second, then disappear.

I'm trying to get this effect: http://jsfiddle.net/ozgr1wfx/