如何在ios上观察core plot中的触摸事件？

我将此代码添加到graphViewController中：

-(BOOL)pointingDeviceDownEvent:(id)event atPoint:(CGPoint)interactionPoint {
    NSLog(@"Touched.");
}

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但它不是一触即发。我做错了什么？

我正在使用CPPlotSpaceDelegate协议在ios上接收触摸

为defaultPlotSpace设置代理后，当收到触摸时，将使用以下方法调用您

-(BOOL)plotSpace:(CPPlotSpace *)space shouldHandlePointingDeviceUpEvent:(id)event atPoint:(CGPoint)point;

-(BOOL)plotSpace:(CPPlotSpace *)space shouldHandlePointingDeviceCancelledEvent:(id)event;

-(BOOL)plotSpace:(CPPlotSpace *)space shouldHandlePointingDeviceDownEvent:(id)event atPoint:(CGPoint)point;

-(BOOL)plotSpace:(CPPlotSpace *)space shouldHandlePointingDeviceDraggedEvent:(id)event atPoint:(CGPoint)point;

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pointingDeviceDownEvent

听起来像是MacOSX上的东西，我不记得是IOS上的。我很可能错了。