objective-c - Core Plot 的 CPTPlotSpaceDelegate : Correct implementation of zooming and panning

Question

我已经实现了代表CPTPlotDataSource和 CPTPlotSpaceDelegate在我的 View Controller 中。我也设置了plotSpace.allowsUserInteraction = YES和 self.hostView.allowPinchScaling = YES .

然而，方法
-(BOOL)plotSpace:(CPTPlotSpace *)space shouldScaleBy:(CGFloat)interactionScale aboutPoint:(CGPoint)interactionPoint ,
-(BOOL)plotSpace:(CPTPlotSpace *)space shouldHandlePointingDeviceDownEvent:(id)event atPoint:(CGPoint)point ,
-(CGPoint)plotSpace:(CPTPlotSpace *)space willDisplaceBy:(CGPoint)proposedDisplacementVector和
-(CPTPlotRange *)plotSpace:(CPTPlotSpace *)space willChangePlotRangeTo:(CPTPlotRange *)newRange forCoordinate:(CPTCoordinate)coordinate即使绘图是可缩放的，也不会调用。

我在代码中遗漏了什么？

谢谢!

Answer 1

我确实忘记设置我的委托(delegate):plotSpace.delegate = self;