关于charts的系列视图介绍传送门：
iOS 图表工具charts介绍
iOS 图表工具charts之LineChartView
iOS 图表工具charts之BarChartView
iOS 图表工具charts之PieChartView
iOS 图表工具charts之CandleStickChartView
iOS 图表工具charts之CombinedChartView

BarChartView在charts中可以用来绘制柱状图,由于charts是基于swift开发的，如果需要和objective-C混编(通过pod的方式不用管)，可以参考我的上几篇文章《iOS OC中桥接swift第三方库》，这里主要讲的是LineChartView的一些常用属性和一些基本用法，实际情况以开发为准

chartView的更加细节的属性设置 请查看我的上篇文章《iOS 图表工具charts之LineChartView》，因为BarChartView大部分基础属性都差不多，这里就不详细写注释了
BarChartView的基础设置

-(void)setupUI{//BarChartView默认纵向展示柱状图， 如果需要横向展示 则创建HorizontalBarChartView即可BarChartView *chartView = [[BarChartView alloc] init];//设置偏移[chartView setExtraOffsetsWithLeft:10 top:10 right:10 bottom:10];//开启borderchartView.drawBordersEnabled = YES;chartView.borderLineWidth = .5f;chartView.borderColor = UIColor.blackColor;//设置背景chartView.drawGridBackgroundEnabled = NO;chartView.gridBackgroundColor = [UIColor grayColor];//无内容显示chartView.noDataText = @"";//关闭描述chartView.chartDescription.enabled = NO;chartView.chartDescription.text = @"tiny`s barChart demo";//关闭图例chartView.legend.enabled = NO;//缩放chartView.scaleXEnabled = NO;chartView.scaleYEnabled = NO;chartView.autoScaleMinMaxEnabled = YES;chartView.highlightPerTapEnabled = NO;chartView.highlightPerDragEnabled = NO;chartView.pinchZoomEnabled = NO;  //手势捏合chartView.dragEnabled = YES;chartView.dragDecelerationFrictionCoef = 0.5;  //0 1 惯性//代理chartView.delegate = self;//leftAxisChartYAxis *leftAxis = chartView.leftAxis;leftAxis.enabled = YES;leftAxis.labelPosition = YAxisLabelPositionOutsideChart;leftAxis.drawGridLinesEnabled = YES;leftAxis.gridLineDashLengths = @[@2,@4];leftAxis.labelTextColor = UIColor.blackColor;leftAxis.labelFont = [UIFont systemFontOfSize:10];leftAxis.decimals = 2;//设置样式LeftAxisFormatter *leftFormatter = [LeftAxisFormatter new];leftAxis.valueFormatter = leftFormatter;//rightAxisChartYAxis *rightAxis = chartView.rightAxis;rightAxis.enabled = NO;//xAxisChartXAxis *xAxis = chartView.xAxis;xAxis.enabled = YES;xAxis.labelPosition = XAxisLabelPositionBottom;//不画线xAxis.drawGridLinesEnabled = NO;BarxAxisFormatter *xFormatter = [BarxAxisFormatter new];xAxis.valueFormatter = xFormatter;xFormatter.titles = @[@"语文",@"数学",@"外语",@"物理"];self.charView = chartView;[self addSubview:self.charView];[self.charView mas_makeConstraints:^(MASConstraintMaker *make) {make.edges.mas_offset(0);}];//draw[self drawData];//执行动画[self.charView animateWithYAxisDuration:1.f];
}-(void)drawData{NSArray *datas = @[@100,@90,@76,@55,@45,@77,@98,@62];NSMutableArray *array = [NSMutableArray array];for (int i = 0; i < datas.count; i++) {BarChartDataEntry *entry = [[BarChartDataEntry alloc] initWithX:i y:[datas[i] integerValue]];[array addObject:entry];}//setBarChartDataSet *set = [[BarChartDataSet alloc] initWithEntries:array label:@"Bar DataSet"];[set setColors:@[UIColor.redColor,UIColor.blueColor,UIColor.blueColor,UIColor.blackColor,UIColor.cyanColor,UIColor.grayColor,UIColor.greenColor,UIColor.cyanColor]];//显示柱图值并格式化NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];numberFormatter.positiveSuffix = @"分";ChartDefaultValueFormatter *formatter = [[ChartDefaultValueFormatter alloc] initWithFormatter:numberFormatter];[set setValueFormatter:formatter];set.highlightEnabled = NO;BarChartData *data = [[BarChartData alloc] initWithDataSet:set];self.charView.data = data;
}#pragma mark - ChartViewDelegate
#pragma mark 图表中数值被选中
-(void)chartValueSelected:(ChartViewBase *)chartView entry:(ChartDataEntry *)entry highlight:(ChartHighlight *)highlight{//    NSLog(@"图表中数值被选中");
}#pragma mark 图表中的空白区域被选中
-(void)chartValueNothingSelected:(ChartViewBase *)chartView{
//    NSLog(@"空白区域被选中");
}#pragma mark 图表被缩放
-(void)chartScaled:(ChartViewBase *)chartView scaleX:(CGFloat)scaleX scaleY:(CGFloat)scaleY{
//    NSLog(@"图表被缩放");
}#pragma mark 图表被移动
-(void)chartTranslated:(ChartViewBase *)chartView dX:(CGFloat)dX dY:(CGFloat)dY{
//    NSLog(@"图表被移动");
}

一些需要注意的点：
1.如果需要给每个bar显示的数字格式化比如 100分, 100t，100g等等添加前缀或者后缀，则可以设置BarChartDataSet属性

    NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];numberFormatter.positiveSuffix = @"分";ChartDefaultValueFormatter *formatter = [[ChartDefaultValueFormatter alloc] initWithFormatter:numberFormatter];[set setValueFormatter:formatter];

2.柱状图动画效果

    //执行动画[self.charView animateWithYAxisDuration:1.f];

3.颜色可以没每个柱子设置颜色

    [set setColors:@[UIColor.redColor,UIColor.blueColor,UIColor.blueColor,UIColor.blackColor,UIColor.cyanColor,UIColor.grayColor,UIColor.greenColor,UIColor.cyanColor]];

4.每个点的数值要显示出来

    set.drawValuesEnabled = YES;

5.柱状图横向显示，只需要将BarChartView换成HorizontalBarChartView即可，其他不变 效果图如下：

6.BarChartData可以添加多个柱子

 BarChartData *data = [[BarChartData alloc] init][data addDataSet:set]

转载请标注来源：https://www.cnblogs.com/qqcc1388/