iOS使用Charts框架绘制饼状图

self.pieChartView = [[PieChartView alloc] init];
self.pieChartView.backgroundColor = BgColor;
[self.view addSubview:self.pieChartView];
[self.pieChartView mas_makeConstraints:^(MASConstraintMaker *make) {
 make.size.mas_equalTo(CGSizeMake(300, 300));
 make.center.mas_equalTo(self.view);
}];

[self.pieChartView setExtraOffsetsWithLeft:30 top:0 right:30 bottom:0];//饼状图距离边缘的间隙
self.pieChartView.usePercentValuesEnabled = YES;//是否根据所提供的数据, 将显示数据转换为百分比格式
self.pieChartView.dragDecelerationEnabled = YES;//拖拽饼状图后是否有惯性效果
self.pieChartView.drawSliceTextEnabled = YES;//是否显示区块文本

self.pieChartView.drawHoleEnabled = YES;//饼状图是否是空心
self.pieChartView.holeRadiusPercent = 0.5;//空心半径占比
self.pieChartView.holeColor = [UIColor clearColor];//空心颜色
self.pieChartView.transparentCircleRadiusPercent = 0.52;//半透明空心半径占比
self.pieChartView.transparentCircleColor = [UIColor colorWithRed:210/255.0 green:145/255.0 blue:165/255.0 alpha:0.3];//半透明空心的颜色

if (self.pieChartView.isDrawHoleEnabled == YES) {
 self.pieChartView.drawCenterTextEnabled = YES;//是否显示中间文字
 //普通文本
// self.pieChartView.centerText = @"饼状图";//中间文字
 //富文本
 NSMutableAttributedString *centerText = [[NSMutableAttributedString alloc] initWithString:@"饼状图"];
 [centerText setAttributes:@{NSFontAttributeName: [UIFont boldSystemFontOfSize:16],
     NSForegroundColorAttributeName: [UIColor orangeColor]}
    range:NSMakeRange(0, centerText.length)];
 self.pieChartView.centerAttributedText = centerText;
}

self.pieChartView.descriptionText = @"饼状图示例";
self.pieChartView.descriptionFont = [UIFont systemFontOfSize:10];
self.pieChartView.descriptionTextColor = [UIColor grayColor];

self.pieChartView.legend.maxSizePercent = 1;//图例在饼状图中的大小占比, 这会影响图例的宽高
self.pieChartView.legend.formToTextSpace = 5;//文本间隔
self.pieChartView.legend.font = [UIFont systemFontOfSize:10];//字体大小
self.pieChartView.legend.textColor = [UIColor grayColor];//字体颜色
self.pieChartView.legend.position = ChartLegendPositionBelowChartCenter;//图例在饼状图中的位置
self.pieChartView.legend.form = ChartLegendFormCircle;//图示样式: 方形、线条、圆形
self.pieChartView.legend.formSize = 12;//图示大小

- (PieChartData *)setData{
 double mult = 100;
 int count = 5;//饼状图总共有几块组成
 //每个区块的数据
 NSMutableArray *yVals = [[NSMutableArray alloc] init];
 for (int i = 0; i < count; i++) {
 double randomVal = arc4random_uniform(mult + 1);
 BarChartDataEntry *entry = [[BarChartDataEntry alloc] initWithValue:randomVal xIndex:i];
 [yVals addObject:entry];
 }
 //每个区块的名称或描述
 NSMutableArray *xVals = [[NSMutableArray alloc] init];
 for (int i = 0; i < count; i++) {
 NSString *title = [NSString stringWithFormat:@"part%d", i+1];
 [xVals addObject:title];
 }
 //dataSet
 PieChartDataSet *dataSet = [[PieChartDataSet alloc] initWithYVals:yVals label:@""];
 dataSet.drawValuesEnabled = YES;//是否绘制显示数据
 NSMutableArray *colors = [[NSMutableArray alloc] init];
 [colors addObjectsFromArray:ChartColorTemplates.vordiplom];
 [colors addObjectsFromArray:ChartColorTemplates.joyful];
 [colors addObjectsFromArray:ChartColorTemplates.colorful];
 [colors addObjectsFromArray:ChartColorTemplates.liberty];
 [colors addObjectsFromArray:ChartColorTemplates.pastel];
 [colors addObject:[UIColor colorWithRed:51/255.f green:181/255.f blue:229/255.f alpha:1.f]];
 dataSet.colors = colors;//区块颜色
 dataSet.sliceSpace = 0;//相邻区块之间的间距
 dataSet.selectionShift = 8;//选中区块时, 放大的半径
 dataSet.xValuePosition = PieChartValuePositionInsideSlice;//名称位置
 dataSet.yValuePosition = PieChartValuePositionOutsideSlice;//数据位置
 //数据与区块之间的用于指示的折线样式
 dataSet.valueLinePart1OffsetPercentage = 0.85;//折线中第一段起始位置相对于区块的偏移量, 数值越大, 折线距离区块越远
 dataSet.valueLinePart1Length = 0.5;//折线中第一段长度占比
 dataSet.valueLinePart2Length = 0.4;//折线中第二段长度最大占比
 dataSet.valueLineWidth = 1;//折线的粗细
 dataSet.valueLineColor = [UIColor brownColor];//折线颜色
 //data
 PieChartData *data = [[PieChartData alloc] initWithXVals:xVals dataSet:dataSet];
 NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
 formatter.numberStyle = NSNumberFormatterPercentStyle;
 formatter.maximumFractionDigits = 0;//小数位数
 formatter.multiplier = @1.f;
 [data setValueFormatter:formatter];//设置显示数据格式
 [data setValueTextColor:[UIColor brownColor]];
 [data setValueFont:[UIFont systemFontOfSize:10]];
 return data;
}