ios - 图表 : Get selected bar data only when tapped inside the bar

Question

我使用了 https://github.com/danielgindi/Charts我项目中的库。
它工作完美，但我只想在用户点击栏内时选择栏数据。
目前，它也会在点击外返回栏数据。
当用户点击栏外时，它提供距离点击最近的栏数据。

我这样设置条形图:

_chartView.delegate = self;

_chartView.drawBarShadowEnabled = NO;
_chartView.drawValueAboveBarEnabled = YES;

_chartView.maxVisibleValueCount = 60;

ChartXAxis *xAxis = _chartView.xAxis;
xAxis.labelPosition = XAxisLabelPositionBottom;
xAxis.labelTextColor = [UIColor whiteColor];
xAxis.labelFont = [UIFont systemFontOfSize:20.f];
xAxis.drawGridLinesEnabled = NO;
xAxis.spaceBetweenLabels = 2.0;
xAxis.labelWidth = 100;

ChartYAxis *leftAxis = _chartView.leftAxis;
leftAxis.labelFont = [UIFont systemFontOfSize:20.f];
leftAxis.labelCount = 5;
leftAxis.labelTextColor = [UIColor whiteColor];
leftAxis.valueFormatter = [[NSNumberFormatter alloc] init];
leftAxis.valueFormatter.maximumFractionDigits = 1;
leftAxis.valueFormatter.negativeSuffix = @"k";
leftAxis.valueFormatter.positiveSuffix = @"k";
leftAxis.valueFormatter.positivePrefix = @"$";
leftAxis.valueFormatter.negativePrefix = @"$";
leftAxis.labelPosition = YAxisLabelPositionOutsideChart;
leftAxis.spaceTop = 0.15;
leftAxis.customAxisMin = 0.0; // this replaces startAtZero = YES


_chartView.legend.position = ChartLegendPositionBelowChartLeft;
_chartView.legend.form = ChartLegendFormSquare;
_chartView.legend.formSize = 20.0;
_chartView.legend.font = [UIFont fontWithName:@"HelveticaNeue-Light" size:20.f];
_chartView.legend.xEntrySpace = 4.0;
_chartView.legend.textColor = [UIColor whiteColor];


NSMutableArray *xVals = [[NSMutableArray alloc] init];

for (int i = 0; i < 12; i++)
{
    [xVals addObject:months[i % 12]];
}

NSMutableArray *yVals = [[NSMutableArray alloc] init];
NSMutableArray *yValsColor = [[NSMutableArray alloc] init];


[yVals addObject:[[BarChartDataEntry alloc] initWithValue:10 xIndex:1]];
[yVals addObject:[[BarChartDataEntry alloc] initWithValue:15 xIndex:2]];
[yVals addObject:[[BarChartDataEntry alloc] initWithValue:20 xIndex:3]];
[yVals addObject:[[BarChartDataEntry alloc] initWithValue:45 xIndex:4]];
[yVals addObject:[[BarChartDataEntry alloc] initWithValue:30 xIndex:5]];
[yVals addObject:[[BarChartDataEntry alloc] initWithValue:5 xIndex:6]];
[yVals addObject:[[BarChartDataEntry alloc] initWithValue:15 xIndex:7]];
[yVals addObject:[[BarChartDataEntry alloc] initWithValue:22 xIndex:8]];
[yVals addObject:[[BarChartDataEntry alloc] initWithValue:32 xIndex:9]];

[yValsColor addObject:[UIColor yellowColor]];

BarChartDataSet *set1 = [[BarChartDataSet alloc] initWithYVals:yVals label:@"Charges"];
set1.barSpace = 0.35;
set1.colors     =  yValsColor;

NSMutableArray *dataSets = [[NSMutableArray alloc] init];
[dataSets addObject:set1];

BarChartData *data = [[BarChartData alloc] initWithXVals:xVals dataSets:dataSets];
[data setValueFont:[UIFont fontWithName:@"HelveticaNeue-Light" size:20.f]];
[data setValueTextColor:[UIColor whiteColor]];

_chartView.data = data;


NSArray *arrLabelData = [NSArray arrayWithObjects:@"All", @"1/1/2016 to 9/29/2016", @"All", @"All", @"Date of Billed",nil];
NSArray *arrLabel     = [NSArray arrayWithObjects:@"Ins:",@" DOS:",@" Location:",@" Provider:",@" Aging Calculation Based On:",nil];


NSMutableAttributedString *strFS = [[NSMutableAttributedString alloc] init];
UIColor *color = [UIColor yellowColor]; // select needed color

NSDictionary *attrs = @{ NSForegroundColorAttributeName : color};
NSDictionary *attrsLab = @{ NSForegroundColorAttributeName : [UIColor whiteColor]};

for(int i = 0; i <arrLabelData.count; i++)
{
    NSString *strLabData = [arrLabelData objectAtIndex:i];
    NSString *strLab     = [arrLabel objectAtIndex:i];

    NSAttributedString *attStringLab        = [[NSAttributedString alloc] initWithString:strLab attributes:attrsLab];
    NSAttributedString *attStringLabData    = [[NSAttributedString alloc] initWithString:strLabData attributes:attrs];

    [strFS appendAttributedString:attStringLab];
    [strFS appendAttributedString:attStringLabData];

}
lblAttributes.attributedText = strFS;

我只想在用户点击栏内时响应数据。
有人知道吗？请帮助我

提前致谢。

Answer 1

我的应用程序中有用户版本 2.2.3 的图表。试试这个实现来解决您的问题

1) 将函数添加到您的 ChartHighlighter.swift 文件。

public func getBarBounds(e: BarChartDataEntry) -> CGRect
{

    guard let
        set = self.chart?._data?.getDataSetForEntry(e) as? IBarChartDataSet
        else { return CGRectNull }

    let barspace = set.barSpace
    let y = CGFloat(e.value)
    let x = CGFloat(e.xIndex)

    let barWidth: CGFloat = 0.5

    let spaceHalf = barspace / 2.0
    let left = x - barWidth + spaceHalf
    let right = x + barWidth - spaceHalf
    let top = y >= 0.0 ? y : 0.0
    let bottom = y <= 0.0 ? y : 0.0

    var bounds = CGRect(x: left, y: top, width: right - left, height: bottom - top)

    self.chart?.getTransformer(ChartYAxis.AxisDependency.Left).rectValueToPixel(&bounds)

    return bounds
}

2) 更新ChartHighlighter.swift 文件中的getHighlight 函数。

public func getHighlight(x x: Double, y: Double) -> ChartHighlight?
{
    let xIndex = getXIndex(x)
    if (xIndex == -Int.max)
    {
        return nil
    }


    let dataSetIndex = getDataSetIndex(xIndex: xIndex, x: x, y: y)
    if (dataSetIndex == -Int.max)
    {
        return nil
    }

    //Modification for only Bar Selection
    let dataSet = self.chart!.data!.getDataSetByIndex(dataSetIndex)
    let e = dataSet.entryForXIndex(xIndex) as! BarChartDataEntry!
    let rectData = getBarBounds(e)

    let point = CGPoint(x: x,y: y)
    let isPointInFrame = CGRectContainsPoint(rectData, point)
    if (!isPointInFrame)
    {
        return nil
    }
    //Modification for only Bar Selection


    return ChartHighlight(xIndex: xIndex, dataSetIndex: dataSetIndex)
}

希望对您有所帮助。快乐编码...