ShinobiCharts：当你点击图表的点时，如何显示X值和Y值

Question

我现在正在使用ShinobiCharts iOS图表框架。

任何人都可以请给我一个例子，提供如下图像的功能？

我想要做的功能是当你点击图表上的点时可以显示X值和Y值。

Answer 1

您必须实现SChartDelegate方法：

对于例如

- (void)sChart:(ShinobiChart *)chart toggledSelectionForSeries:(SChartSeries *)series nearPoint:(SChartDataPoint *)dataPoint atPixelCoordinate:(CGPoint)pixelPoint{ 
NSLog(@"x value:%@",dataPoint.xValue); 
NSLog(@"y value:%@",dataPoint.yValue); 
//here you can create an label to show the x/y values or even can add an annotation 
} 

，你也可以使用点选择以下方法

- (void)sChart:(ShinobiChart *)chart toggledSelectionForPoint:(SChartDataPoint *)dataPoint inSeries:(SChartSeries *)series atPixelCoordinate:(CGPoint)pixelPoint{ 
    //Your code goes here 
} 

Answer 2

你必须CrossHairEnabled设置为YES是这样的：

- (SChartSeries*)barSeriesForKey:(NSString*)key { 

SChartBarSeries *series = [SChartBarSeries new]; 

series.stackIndex = [NSNumber numberWithInt:1]; 
series.crosshairEnabled = YES; // this is what you want 
series.title = [self titleForKey:key]; 

if ([key isEqualToString:land]) { 

    series.style = [self.theme barSeriesStyleForSeriesAtIndex:3 selected:NO]; 
} 

return series; 
} 

Answer 3

为了显示默认准星你需要设置以下内容：

启用十字准线系列

-(SChartSeries *)sChart:(ShinobiChart *)chart seriesAtIndex:(int)index { 
    SChartLineSeries *lineSeries = [[SChartLineSeries alloc] init]; 
    lineSeries.style.lineColor = [UIColor darkGrayColor]; 
    lineSeries.crosshairEnabled = YES; 
    lineSeries.selectionMode = SChartSelectionPoint; 
    return lineSeries; 
} 

使用默认的十字线提示

[chart.crosshair setDefaultTooltip];