iOS:两个条形图在一起

我正在使用图表库(Charts)

我正在开发的应用程序允许我实时显示餐厅的客人数量并比较不同日期之间的数据。 例如看这张图片

虚线表示比较日期的数据。我想像这样创建条形图，但库只允许我显示 4 个分组条。我想在带有小偏移的彩色虚线上方显示。请帮帮我

我的代码是:

for (int i = 0; i < days.count; i++) {
        BarChartDataEntry *guysEntry = [[BarChartDataEntry alloc] initWithX:i y:[guys[i] integerValue]];
        [guysChartDataArray addObject:guysEntry];

        BarChartDataEntry *girlsEntry = [[BarChartDataEntry alloc] initWithX:i y:[girls[i] integerValue]];
        [girlsChartDataArray addObject:girlsEntry];

        BarChartDataEntry *guysCompareToEntry = [[BarChartDataEntry alloc] initWithX:i y:[guysCompareTo[i] integerValue]];
        [guysCompareToChartDataArray addObject:guysCompareToEntry];

        BarChartDataEntry *girlsCompareToEntry = [[BarChartDataEntry alloc] initWithX:i y:[girlsCompareTo[i] integerValue]];
        [girlsCompareToChartDataArray addObject:girlsCompareToEntry];
    }
    BarChartDataSet *guysChartDataSet = [[BarChartDataSet alloc] initWithValues:guysChartDataArray label"Guys"];
    guysChartDataSet.colors = @[[UIColor maleColor]];
    guysChartDataSet.valueTextColor = [UIColor clearColor];

    BarChartDataSet *girlsChartDataSet = [[BarChartDataSet alloc] initWithValues:girlsChartDataArray label"Girls"];
    girlsChartDataSet.colors = @[[UIColor femaleColor]];
    girlsChartDataSet.valueTextColor = [UIColor clearColor];

    LineChartXAxisFormatter *barGraphXFormatter = [[LineChartXAxisFormatter alloc] init];
    barGraphXFormatter.xLabels = [days mutableCopy];
    self.barChartView.xAxis.valueFormatter = barGraphXFormatter;
    self.barChartView.xAxis.centerAxisLabelsEnabled = YES;

    self.combinedChartView.xAxis.valueFormatter = barGraphXFormatter;
    self.combinedChartView.xAxis.centerAxisLabelsEnabled = YES;

    float groupSpace = 0.06f;
    float barSpace = 0.02f;
    float barWidth = 0.45f;

    BarChartDataSet *guysCompareToChartDataSet = [[BarChartDataSet alloc] initWithValues:guysCompareToChartDataArray label"Guys (Compare)"];
    guysCompareToChartDataSet.colors = @[[UIColor clearColor]];
    guysCompareToChartDataSet.barBorderWidth = 1.f;
    guysCompareToChartDataSet.barBorderColor = [UIColor grayColor];
    guysCompareToChartDataSet.isDashedBorder = YES;

    guysCompareToChartDataSet.axisDependency = AxisDependencyLeft;
    guysCompareToChartDataSet.valueTextColor = [UIColor clearColor];

    BarChartDataSet *girlsCompareToChartDataSet = [[BarChartDataSet alloc] initWithValues:girlsCompareToChartDataArray label"Girls (Compare)"];
    girlsCompareToChartDataSet.colors = @[[UIColor clearColor]];
    girlsCompareToChartDataSet.barBorderWidth = 1.f;
    girlsCompareToChartDataSet.barBorderColor = [UIColor grayColor];
    girlsCompareToChartDataSet.isDashedBorder = YES;
    girlsCompareToChartDataSet.axisDependency = AxisDependencyLeft;
    girlsCompareToChartDataSet.valueTextColor = [UIColor clearColor];

    NSArray *dataSets = @[guysChartDataSet, girlsChartDataSet, guysCompareToChartDataSet, girlsCompareToChartDataSet];

    BarChartData *barChartData = [[BarChartData alloc] initWithDataSets:dataSets];
    barChartData.barWidth = barWidth;

    CGFloat initialValue = 0;
    CGFloat groupCount = days.count;

    self.barChartView.xAxis.axisMinimum = initialValue;

    self.barChartView.xAxis.axisMaximum = initialValue + [barChartData groupWidthWithGroupSpace:groupSpace barSpace: barSpace] * groupCount;

    [barChartData groupBarsFromX:0 groupSpace:groupSpace barSpace:barSpace];
    self.barChartView.data = barChartData;

我想做类似的东西:

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Best Answer-推荐答案

既然你已经改变了你的问题，这就需要一个不同的解决方案。

正如我之前在评论中提到的，您需要手动计算每个条的位置。然后，不要使用分组功能，因为您已经按照自己的意愿对它们进行了分组。

// Determine bar sizing and spacing parameters.
int barsPerGroup = 2;
double targetGroupWidth = 1;
double barSpacing = 0.2;
double groupSpacing = 0.3;
double barWidth = (targetGroupWidth - groupSpacing - barSpacing * barsPerGroup) / barsPerGroup;
double compareBarOffset = barWidth / 3;

for (int i = 0; i < entryCount; i++) {

    // Determine X position for each bar
    // NOTE: This is the most important step!
    double groupStartPosition = targetGroupWidth * i;

    double group1X = groupStartPosition + barWidth / 2;
    double group1CompareX = group1X + compareBarOffset;

    double group2X = group1X + barWidth + barSpacing;
    double group2CompareX = group2X + compareBarOffset;


    // Create data entries positioned at values calculated by previous step
    NSNumber *group1Value = group1[i];
    NSNumber *group1CompareValue = group1Compare[i];

    NSNumber *group2Value = group2[i];
    NSNumber *group2CompareValue = group2Compare[i];


    BarChartDataEntry *group1DataEntry = [[BarChartDataEntry alloc] initWithX:group1X
                                                                            y:[group1Value doubleValue]];
    BarChartDataEntry *group1CompareDataEntry = [[BarChartDataEntry alloc] initWithX:group1CompareX
                                                                                   y:[group1CompareValue doubleValue]];

    BarChartDataEntry *group2DataEntry = [[BarChartDataEntry alloc] initWithX:group2X
                                                                            y:[group2Value doubleValue]];
    BarChartDataEntry *group2CompareEntry = [[BarChartDataEntry alloc] initWithX:group2CompareX
                                                                               y:[group2CompareValue doubleValue]];


    // ...
}

// Create Data Sets, set styles, etc.
// ...

// Do NOT use this method because bars are already grouped.
//[barChartView groupBarsFromX:0 groupSpace:groupSpacing barSpace:barSpacing];

结果:

注意:我找不到属性 isDashedBorder，所以我不知道您使用的是什么版本的库。相反，我只是设置了带有纯灰色边框的清晰条。

关于iOS:两个条形图在一起，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50853671/