iphone - 如何在核心图中旋转CPTGraphhostingview

请指导我如何通过单手指触摸（时钟和反时钟）方向旋转CPTGraphHostingView

谢谢

最佳答案

//我已经使用此代码旋转饼图几秒钟而无需用户干预。

-(void)ConstPieChart
{
     graph = [[CPXYGraph alloc] initWithFrame: CGRectZero];

     viewGraphHostingPie.hostedGraph=graph;

     CPPieChart *pieChart = [[CPPieChart alloc] init];
     pieChart.dataSource = self;
     pieChart.delegate = self;
     pieChart.pieRadius = 100.0;
     pieChart.identifier = @"PieChart1";
     pieChart.startAngle=0;
     //pieChart.startAngle = M_PI_4;
     pieChart.sliceDirection = CPPieDirectionCounterClockwise;



     NSMutableArray *ValueArray = [[NSMutableArray alloc]init];
     ValueArray = [NSArray arrayWithObjects:[NSNumber numberWithDouble:57.03],[NSNumber numberWithDouble:66.00],[NSNumber numberWithDouble:77.03],nil];
     self.pieData = ValueArray;




    CABasicAnimation *rotation = [CABasicAnimation animationWithKeyPath:@"transform"];
    CATransform3D transform = CATransform3DMakeRotation(360, 0, 0, 1);
    rotation.toValue = [NSValue valueWithCATransform3D:transform];
    rotation.duration = 15.0f;
    [pieChart addAnimation:rotation forKey:@"rotation"];
    [graph addPlot:pieChart];
     [pieChart release];
}