iOS 图表工具charts之PieChartView

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

PieChartView在charts中可以用来绘制饼状图,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PieChartView的一些常用属性和一些基本用法，实际情况以开发为准

PieChartView的一下属性介绍

PieChartView*chartView =[[PieChartView alloc] init];//设置偏移[chartView setExtraOffsetsWithLeft:20 top:20 right:20 bottom:20];//无内容显示 chartView.noDataText =@“”;//关闭描述 chartView.chartDescription.enabled = YES; chartView.chartDescription.text =@“tiny`s barChart demo”;//关闭图例 chartView.legend.enabled = YES;//将数据转换为百分比 chartView.usePercentValuesEnabled = YES;//惯性 chartView.dragDecelerationFrictionCoef =0.5;//0 1 惯性//设置中间文字 chartView.drawCenterTextEnabled = YES; chartView.centerText =@“我是中间文字”;//显示扇形区域文字 chartView.drawEntryLabelsEnabled = YES;//可以旋转 chartView.rotationEnabled= YES;//扇区可点击 chartView.highlightPerTapEnabled = YES;//代理 chartView.delegate=self;

PieChartDataEntry 每个扇形区域

NSArray *datas = @[@”24″,@”74″,@”35″];

NSArray *titles = @[@”Pie1″,@”Pie2″,@”Pie3″];

NSMutableArray *array = [NSMutableArray array];

for (int i = 0; i < datas.count; i++) {

PieChartDataEntry *entry = [[PieChartDataEntry alloc] initWithValue:[datas[i] integerValue] label:titles[i]];

[array addObject:entry];

}

PieChartDataSet 多个PieChartDataEntry扇形区域组合在一起就成了一个饼状图

PieChartDataSet *set = [[PieChartDataSet alloc] initWithEntries:array label:@”Pie DataSet”]; //颜色(每个扇形区域可以单独设置颜色)

set.colors = @[UIColor.redColor,UIColor.blueColor,UIColor.cyanColor];

set.entryLabelFont = [UIFont systemFontOfSize:20];

set.entryLabelColor = [UIColor blackColor];

set.drawIconsEnabled = NO;

// 当饼状图带折线时，dataSet.yValuePosition 数值的位置只有设置为

// PieChartValuePositionOutsideSlice，折线才会显示，valueLine相关属性才有用

set.drawValuesEnabled = YES;

set.valueFont = [UIFont systemFontOfSize:20];

set.valueColors = @[UIColor.redColor,UIColor.blueColor,UIColor.cyanColor];

set.yValuePosition = PieChartValuePositionOutsideSlice;

set.valueLineColor = UIColor.greenColor;

//格式化

NSNumberFormatter *pFormatter = [[NSNumberFormatter alloc] init];

pFormatter.numberStyle = NSNumberFormatterPercentStyle;

pFormatter.maximumFractionDigits = 1;

pFormatter.multiplier = @1.f;

pFormatter.percentSymbol = @” %”;

set.valueFormatter = [[ChartDefaultValueFormatter alloc] initWithFormatter:pFormatter]; //相邻区块之间的间距

set.sliceSpace = 5;

//扇形区域放大范围

set.selectionShift = 8;

//动画开始的角度 PieChartData *data = [[PieChartData alloc] initWithDataSet:set]; self.chartView.data = data;

//动画开启

[self.chartView animateWithXAxisDuration:2.0f easingOption:ChartEasingOptionEaseOutExpo];

一些需要注意的点：

1.点击扇形区域可以缩放

1.设置PieChartView可点击chartView.highlightPerTapEnabled = YES;

2.设置PieChartDataSet缩放系数set.selectionShift = 8;

2.扇形区域刚出来的时候动画旋转一定的角度

[self.chartView animateWithXAxisDuration:2.0f easingOption:ChartEasingOptionEaseOutExpo];

3.扇形区域折线要显示出来

1.当饼状图带折线时，dataSet.yValuePosition 数值的位置只有设置为 PieChartValuePositionOutsideSlice，折线才会显示，valueLine相关属性才有用

2. set.drawValuesEnabled = YES;

set.valueFont = [UIFont systemFontOfSize:20];

set.valueColors = @[UIColor.redColor,UIColor.blueColor,UIColor.cyanColor];

set.yValuePosition = PieChartValuePositionOutsideSlice;

set.valueLineColor = UIColor.greenColor;

4.扇形区域数值百分比格式化

NSNumberFormatter *pFormatter = [[NSNumberFormatter alloc] init];

pFormatter.numberStyle = NSNumberFormatterPercentStyle;

pFormatter.maximumFractionDigits = 1;

pFormatter.multiplier = @1.f;

pFormatter.percentSymbol = @” %”;

set.valueFormatter = [[ChartDefaultValueFormatter alloc] initWithFormatter:pFormatter];

5.显示扇形区域的描述文字

1.设置文字可显示 chartView.drawEntryLabelsEnabled = NO;

2.每个扇形区域设置文字titles为对应的文字描述

NSArray *datas = @[@”24″,@”74″,@”35″];

NSArray *titles = @[@”Pie1″,@”Pie2″,@”Pie3″];

NSMutableArray *array = [NSMutableArray array];

for (int i = 0; i < datas.count; i++) {

PieChartDataEntry *entry = [[PieChartDataEntry alloc] initWithValue:[datas[i] integerValue] label:titles[i]];

[array addObject:entry];

}

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