barChartView 图表属性

    //1.barChartView 设置
    [barChartView setExtraOffsetsWithLeft:10 top:10 right:10 bottom:20];//图表四周边距
    barChartView.chartDescription.enabled = NO;//图表描述是否展示
    barChartView.drawGridBackgroundEnabled = NO;//是否绘制图表背景网线
    barChartView.dragEnabled = NO; //是否可以拖拽
    [barChartView setScaleEnabled:NO];//是否开启图表缩放能力
    barChartView.pinchZoomEnabled = NO; //XY轴是否同时缩放
    barChartView.rightAxis.enabled = NO; //left Y轴隐藏
    barChartView.leftAxis.enabled = NO;//right Y轴隐藏
    barChartView.doubleTapToZoomEnabled = NO; //双击是否缩放
    barChartView.legend.enabled = NO; //不显示图例说明
    barChartView.highlightPerTapEnabled = NO;//是否开启高亮点击
    barChartView.drawBarShadowEnabled = NO;//是否绘制柱形的阴影背景
    //2.设置 Y轴
    ChartYAxis * rightAxis = barChartView.rightAxis;
    rightAxis.drawLabelsEnabled = NO; //不显示 右边 y 轴数值
    rightAxis.drawGridLinesEnabled = NO;//不绘制网格
    
    ChartYAxis * leftAxis = barChartView.leftAxis;
    leftAxis.drawLabelsEnabled = NO; //不显示 左边 y 轴数值
    leftAxis.drawGridLinesEnabled = NO;//不绘制网格
    leftAxis.axisMinimum =  0;//y 轴最小值
    leftAxis.drawAxisLineEnabled = NO;

    //3.设置 X轴
    ChartXAxis * xAxis = barChartView.xAxis;
    xAxis.granularity = 1.0;
    xAxis.drawGridLinesEnabled = NO;//不绘制网格
    xAxis.drawAxisLineEnabled = NO;//不绘制网格线
    xAxis.axisLineColor = [UIColor redColor]; //底部 x轴颜色
    xAxis.labelPosition = XAxisLabelPositionBottom; //label 显示的位置
    xAxis.labelFont = [UIFont systemFontOfSize:10]; //label 显示文字大小
    xAxis.labelTextColor = [UIColor colorWithHexString:loginBackColor];//label 显示文字颜色
    xAxis.valueFormatter = self;  //显示 X 轴标题代理

    //限制线
    ChartLimitLine *limitLine = [[ChartLimitLine alloc] initWithLimit:1000 label:@"文字描述"];
    limitLine.lineWidth = 1;
    limitLine.lineColor = [UIColor colorWithHexString:EEEEEEColor];
    limitLine.labelPosition = ChartLimitLabelPositionBottomRight;//位置
    limitLine.valueTextColor = [UIColor colorWithHexString:loginBackColor];//label文字颜色
    limitLine.valueFont = [UIFont systemFontOfSize:9];//label字体
    [leftAxis addLimitLine:limitLine];
    leftAxis.drawLimitLinesBehindDataEnabled = YES;

    BarChartData * data = [[BarChartData alloc] initWithDataSets:dataSets];
    data.barWidth = [self optimalBarWidthRatioWithMaxBarWidth:10 minBarSpace:3 xAxisCount:array.count];

  
    //更新图表数据
    self.barChartView.data = data;
    //图表一页显示的最大数量 最好在更新图表数据后调用，也就是在  self.barChartView.data = data; 这句话之后调用下面两句话
    [self.barChartView setVisibleXRangeMaximum:array.count];
    [self.barChartView setVisibleXRangeMinimum:array.count];

BarChartView

• 最大值和最小值 缩放比例 1/200 例如：如果最大值为 1000 空数据时 可以设置为 5；

计算柱状图宽度的方法

- (CGFloat)optimalBarWidthRatioWithMaxBarWidth:(CGFloat)maxBarWidth minBarSpace:(CGFloat)minBarSpace xAxisCount:(NSInteger)xAxisCount {
    CGFloat width = Device_Width - 20; //图表宽度
    CGFloat result = maxBarWidth * xAxisCount / width;
    CGFloat maxResult = maxBarWidth / (minBarSpace + maxBarWidth);
    if (result >= 1.0 || result >= maxResult) {
        result = maxResult;
    }
    return result;
}

效果图

IMG_0299.PNG

IMG_0300.PNG

IMG_0301.PNG

备注

个人笔记