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copied!<p>It looks like you missed first and second slices. <code>numberOfRecordsForPlot</code> can return 4, but in <code>numberForPlot</code> some code returns <code>nil</code>.. I created a new Pie Chart with your values, and all works nice. See code below.</p> <p>You can also try to see data labels for every slice in the <code>-(CPLayer *)dataLabelForPlot:(CPPlot *)plot recordIndex:(NSUInteger)index</code> delegate method. If you really have 4 slices then 2 of them will placed at the same position. Code below is as well.</p> <p><img src="https://i.stack.imgur.com/xfg5q.png" alt="enter image description here"></p> <pre><code>-(void) viewDidLoad{ NSMutableArray *contentArray = [NSMutableArray arrayWithObjects:[NSNumber numberWithInt:9], [NSNumber numberWithInt:9], [NSNumber numberWithInt:63], [NSNumber numberWithInt:18], nil]; self.dataForChart = contentArray; // Add pie chart CPPieChart *piePlot = [[CPPieChart alloc] init]; piePlot.dataSource = self; piePlot.pieRadius = 100.0; piePlot.identifier = @"Pie Chart 1"; piePlot.startAngle = M_PI; piePlot.sliceDirection = CPPieDirectionClockwise; piePlot.delegate = self; [pieChart addPlot:piePlot]; [piePlot release]; } #pragma mark - #pragma mark Plot Data Source Methods -(NSUInteger)numberOfRecordsForPlot:(CPPlot *)plot{ return [self.dataForChart count]; } -(NSNumber *)numberForPlot:(CPPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index { if ( index >= [self.dataForChart count] ) return nil; if ( fieldEnum == CPPieChartFieldSliceWidth ) { return [self.dataForChart objectAtIndex:index]; } else { return [NSNumber numberWithInt:index]; } } -(CPLayer *)dataLabelForPlot:(CPPlot *)plot recordIndex:(NSUInteger)index { CPTextLayer *label = [[CPTextLayer alloc] initWithText:[NSString stringWithFormat:@"%lu", index]]; label.textStyle.color = [CPColor lightGrayColor]; return [label autorelease]; } </code></pre>

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