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    <p>I have implemented pie piece selection in my iPad app with CorePlot 0.2.2. Your guess to use <strong>(void)pieChart:sliceWasSelectedAtRecordIndex:</strong> is correct, but maybe you have forgotten to declare the following two things:</p> <ul> <li>Does your controller declares the <strong>CPPieChartDelegate</strong> protocol?</li> <li>Did you tell the pie chart that your controller is its <strong>delegate</strong>?</li> </ul> <p>My view controller looks like this in the header declaration:</p> <pre><code>@interface YourViewController : UIViewController &lt; CPPieChartDataSource, CPPieChartDelegate, ... &gt; { ... CPXYGraph* pieGraph; CPGraphHostingView* pieView; } @property (nonatomic, retain) IBOutlet CPGraphHostingView* pieView; - (void)pieChart:(CPPieChart *)plot sliceWasSelectedAtRecordIndex:(NSUInteger)index; @end </code></pre> <p>The creation of the pie chart is called during the <strong>(void)viewDidLoad</strong>, where I set the data source and the delegate of the pie chart:</p> <pre><code>-(void)viewDidLoad { [self createPie]; } -(void)createPie { pieGraph = [[CPXYGraph alloc] initWithFrame:CGRectZero]; pieGraph.axisSet = nil; self.pieView.hostedGraph = pieGraph; CPPieChart *pieChart = [[CPPieChart alloc] init]; // This is important in order to have your slice selection handler called! pieChart.delegate = self; pieChart.dataSource = self; pieChart.pieRadius = 80.0; [pieGraph addPlot:pieChart]; [pieChart release]; } - (void)pieChart:(CPPieChart *)plot sliceWasSelectedAtRecordIndex:(NSUInteger)index { // Do whatever you need when the pie slice has been selected. } </code></pre>
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    1. POHow do you enable touch selection of a section in a Core Plot pie chart?
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    1. USMarcus Gründler
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    1. COtoo bad the asker never accepts anything lol...
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      1. USReimius
 

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