Charts 3.0框架绘制-柱形图表

浏览: 64 发布日期: 2017-01-04 分类: ios

使用Charts框架可以实现柱形图、曲线图、圆型图等。

图表

图表

画折线使用 LineChartView类,用法与barChartView类型。其他类图标可参考ChartsDemo里面的案例实现

一、初始化

柱形图使用Charts框架中的BarChartView类:

_chartView = [[BarChartView alloc]init];
    //设置代理
    _chartView.delegate = self;//代理
    [self.view addSubview:_chartView];

二、设置图表格式

1.基本样式

_chartView.descriptionText = @"";//右下角描述
    _chartView.drawBarShadowEnabled = NO;//是否绘制阴影背景
    _chartView.drawValueAboveBarEnabled = YES;//数值显示是否在条柱上面
    _chartView.noDataText = NSLocalizedString(@"加载中...", nil);//没有数据时的显示
    _chartView.rightAxis.enabled = NO;//不画右边坐标轴
    _chartView.legend.enabled = NO;//不显示图例说明
    _chartView.dragEnabled = NO;//不启用拖拽图表

2.交互设置

_chartView.doubleTapToZoomEnabled = NO;//双击是否缩放
    _chartView.scaleXEnabled = NO;//X轴缩放
    _chartView.scaleYEnabled = NO;//Y轴缩放
    _chartView.pinchZoomEnabled = NO;//XY轴是否同时缩放

3.X轴样式设置

ChartXAxis *xAxis = _chartView.xAxis;
    xAxis.labelPosition = XAxisLabelPositionBottom;//X轴的显示位置
    xAxis.drawGridLinesEnabled = NO;//不绘制网格
    xAxis.labelFont = [UIFont systemFontOfSize:10.0f];//x数值字体大小
    xAxis.labelTextColor = [UIColor blackColor];//数值字体颜色
    DateFormatter *valueFormatter = [[DateFormatter alloc] init];//坐标数值样式
    xAxis.valueFormatter = valueFormatter;
    xAxis.labelCount = 7;

4.Y轴样式设置

NSNumberFormatter *leftAxisFormatter = [[NSNumberFormatter alloc] init];//坐标数值样式
    leftAxisFormatter.maximumFractionDigits = 1;//Y轴坐标最多为1位小数
    ChartYAxis *leftAxis = _chartView.leftAxis;
    leftAxis.drawZeroLineEnabled = YES;//从0开始绘画
    leftAxis.axisMaximum = 60;//最大值
    leftAxis.axisMinimum = 0;//最小值
    leftAxis.valueFormatter = [[ChartDefaultAxisValueFormatter alloc] initWithFormatter:leftAxisFormatter];
    leftAxis.labelFont = [UIFont systemFontOfSize:10.f];//字体大小
    leftAxis.labelPosition = YAxisLabelPositionOutsideChart;//坐标数值的位置
    leftAxis.labelCount = 8;//数值分割个数
    leftAxis.labelTextColor = [UIColor blackColor];//坐标数值字体颜色
    leftAxis.spaceTop = 0.15;//最大值到顶部的范围比
    leftAxis.drawGridLinesEnabled = YES;//是否绘制网格
    leftAxis.axisLineWidth = 1;//Y轴线宽
    leftAxis.axisLineColor = [UIColor blackColor];//Y轴颜色

    ChartYAxis *right = _chartView.rightAxis;
    right.drawLabelsEnabled = NO;//是否显示Y轴坐标
    right.drawGridLinesEnabled = NO;//不绘制网格

5.marker设置

点击条柱时的数据展示,ChartsDemo中包含BalloonMarker类

BalloonMarker *marker = [[BalloonMarker alloc]
                             initWithColor: [UIColor colorWithWhite:180/255. alpha:1.0]
                             font: [UIFont systemFontOfSize:12.0]
                             textColor: UIColor.whiteColor
                             insets: UIEdgeInsetsMake(4.0, 4.0, 10.0, 4.0)];
    marker.chartView = _chartView;
    marker.minimumSize = CGSizeMake(40.f, 20.f);
    _chartView.marker = marker;

设置动画

[_chartViewanimateWithYAxisDuration:1.0f];

ChartLimitLine类即可添加限制线,使用可参考ChartsDemo

三、data设置

- (void)setDataCount:(int)count {

    NSMutableArray *yVals = [[NSMutableArray alloc] init];
    for (int i = 0; i < count; i++) {
        int val = (double) (arc4random_uniform(60))+2;
        [yVals addObject:[[BarChartDataEntry alloc] initWithX:i y:val]];
    }

    BarChartDataSet *set1 = [[BarChartDataSet alloc] initWithValues:yVals label:@"DataSet"];
    [set1 setColor:[UIColor grayColor]];//bar的颜色
    [set1 setValueTextColor: [UIColor lightGrayColor]];
//    [set1 setDrawValuesEnabled:NO];//是否在bar上显示数值
//    [set1 setHighlightEnabled:NO];//是否点击有高亮效果,为NO是不会显示marker的效果

    NSMutableArray *dataSets = [[NSMutableArray alloc] init];
    [dataSets addObject:set1];
    BarChartData *data = [[BarChartData alloc] initWithDataSets:dataSets];
    [data setValueFont:[UIFont systemFontOfSize:10]];
    self.chartView.data = data;
    [self.chartView notifyDataSetChanged];

}

四、实现barChartView的代理方法

1.点击选中时的代理

- (void)chartValueSelected:(ChartViewBase * __nonnull)chartView entry:(ChartDataEntry * __nonnull)entry highlight:(ChartHighlight * __nonnull)highlight{
    NSLog(@"chartValueSelected");
}

2.没有选中时的代理

- (void)chartValueNothingSelected:(ChartViewBase * __nonnull)chartView{
    NSLog(@"chartValueNothingSelected");
}

3.捏合放大或缩小

- (void)chartScaled:(ChartViewBase * _Nonnull)chartView scaleX:(CGFloat)scaleX scaleY:(CGFloat)scaleY {
    NSLog(@"---chartScaled---scaleX:%g, scaleY:%g", scaleX, scaleY);
}

4.拖拽图表时的代理方法

- (void)chartTranslated:(ChartViewBase * _Nonnull)chartView dX:(CGFloat)dX dY:(CGFloat)dY {
    NSLog(@"---chartTranslated---dX:%g, dY:%g", dX, dY);
}

效果:

效果图

 

来自:http://www.jianshu.com/p/e60acab520b4

 

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