ios - 悬停在CPTPlotSymbol上显示工具提示

我正在与Core Plot一起绘制散点图。它工作正常。但是我想在将CPTPlotSymbol悬停时显示当前值。请看下图:

这是示例代码:

- (void)configurePlots
{
[...]
    CPTMutableLineStyle *lineStyle = [myPlot.dataLineStyle mutableCopy];
    lineStyle.lineWidth = 2.5;
    lineStyle.lineColor = [CPTColor greenColor];
    myPlot.dataLineStyle = lineStyle;
    CPTMutableLineStyle *symbolLineStyle = [CPTMutableLineStyle lineStyle];
    symbolLineStyle.lineColor = [CPTColor greenColor];
    CPTPlotSymbol *symbol = [CPTPlotSymbol ellipsePlotSymbol];
    symbol.fill = [CPTFill fillWithColor:[CPTColor greenColor]];
    symbol.lineStyle = symbolLineStyle;
    symbol.size = CGSizeMake(6.0f, 6.0f);
    myPlot.plotSymbol = symbol;
}

最佳答案

如果要在触摸条/点时显示任何其他信息，则应实施

    -(void)barPlot:(CPTBarPlot *)plot barWasSelectedAtRecordIndex:(NSUInteger)index {
}

要么

-(void)scatterPlot:(CPScatterPlot *)plot plotSymbolWasSelectedAtRecordIndex:    (NSUInteger)index
{
}

委托方法(取决于图表类型)。不要忘记设置一个代表。