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;}