iOS画出精美的图表方法示例

//初始化折线图- (LineChartView *)lineChartView{ if(!_lineChartView){  _lineChartView = [[LineChartView alloc] initWithFrame:CGRectZero];  [_lineChartView setExtraOffsetsWithLeft:15 top:0 right:15 bottom:10];//距离边缘的间隙  _lineChartView.delegate = self;//设置代理  _lineChartView.backgroundColor = [UIColor whiteColor];  _lineChartView.noDataText = @"暂无此产品的价格趋势";  _lineChartView.noDataFont = [UIFont systemFontOfSize:15];  _lineChartView.noDataTextColor = HEXCOLOR(0x444444);  _lineChartView.chartDescription.enabled = YES;  _lineChartView.scaleYEnabled = NO;//取消Y轴缩放  _lineChartView.scaleXEnabled = NO;//取消X轴缩放  _lineChartView.doubleTapToZoomEnabled = NO;//取消双击缩放  _lineChartView.dragEnabled = YES;//启用拖拽  _lineChartView.dragDecelerationEnabled = YES;//拖拽后是否有惯性效果  _lineChartView.dragDecelerationFrictionCoef = 0.9;//拖拽后惯性效果的摩擦系数(0~1)，数值越小，惯性越不明显  //描述及图例样式  [_lineChartView setDescriptionText:@""];  _lineChartView.legend.enabled = NO;    //设置左侧Y轴  _lineChartView.rightAxis.enabled = YES;//绘制右边轴  ChartYAxis *leftAxis = _lineChartView.leftAxis;//获取左边Y轴  leftAxis.labelCount = 5;//Y轴label数量，数值不一定，如果forceLabelsEnabled等于YES, 则强制绘制制定数量的label, 但是可能不平均  leftAxis.forceLabelsEnabled = NO;//不强制绘制指定数量的labe  leftAxis.axisLineWidth = 0.6;  //设置Y轴线宽  leftAxis.axisLineColor = [UIColor blackColor]; //设置Y轴颜色  // leftAxis.axisMinValue = 0;//设置Y轴的最小值  //leftAxis.axisMaxValue = 105;//设置Y轴的最大值  leftAxis.inverted = NO;//是否将Y轴进行上下翻转  leftAxis.axisLineColor = [UIColor blackColor];//Y轴颜色  leftAxis.labelPosition = YAxisLabelPositionInsideChart;//label位置  leftAxis.labelTextColor = [UIColor blackColor];//文字颜色  leftAxis.labelFont = [UIFont systemFontOfSize:10.0f];//文字字体  //leftAxis.valueFormatter = [[SymbolsValueFormatter alloc]init];//设置y轴的数据格式  leftAxis.gridLineDashLengths = @[@3.0f, @3.0f];//设置虚线样式的网格线  leftAxis.gridColor = [UIColor colorWithRed:200/255.0f green:200/255.0f blue:200/255.0f alpha:1];//网格线颜色  leftAxis.gridAntialiasEnabled = YES;//开启抗锯齿    //设置Z轴  ChartYAxis *rightAxis = _lineChartView.rightAxis;//获取右边Z轴  rightAxis.axisLineWidth = 0.6;  rightAxis.axisLineColor = [UIColor blackColor];//Z轴颜色  rightAxis.drawGridLinesEnabled = NO;  rightAxis.drawLabelsEnabled = NO;    //设置X轴  ChartXAxis *xAxis = _lineChartView.xAxis;  xAxis.valueFormatter = self;   //这里才是最最最最最最关键的代码  xAxis.granularityEnabled = YES;//设置重复的值不显示  xAxis.labelCount = 5;  xAxis.spaceMin = 0;    //设置坐标轴额外的最小空间  xAxis.forceLabelsEnabled = YES;  xAxis.labelPosition = XAxisLabelPositionBottom;//设置x轴数据在底部  xAxis.labelTextColor = [UIColor blackColor];//文字颜色  xAxis.axisLineWidth = 0.6;  xAxis.axisLineColor = [UIColor blackColor]; //X轴的颜色  xAxis.gridLineDashLengths = @[@3.0f, @3.0f];//设置虚线样式的网格线  xAxis.gridColor = [UIColor colorWithRed:200/255.0f green:200/255.0f blue:200/255.0f alpha:1];//网格线颜色  xAxis.gridAntialiasEnabled = YES;//开启抗锯齿  //_lineChartView.maxVisibleCount = 999;//设置能够显示的数据数量    //设置浮层  _lineChartView.drawMarkers = YES;  ChartMarkerView * makerView = [[ChartMarkerView alloc]init];  makerView.offset = CGPointMake(-self.subPriceView.frame.size.width,-self.subPriceView.frame.size.height/2);  makerView.chartView = _lineChartView;  _lineChartView.marker = makerView;  [makerView addSubview:self.subPriceView]; } return _lineChartView;}

//折线图的数据源- (LineChartData *)getLineData{  if(self.priceTrendDataSource.count == 0) return nil;  //X轴上面需要显示的数据 NSMutableArray *xVals = [NSMutableArray array];  //对应Y轴上面需要显示的数据,价格 NSMutableArray *yVals = [NSMutableArray array];  NSInteger index = 0;  for (PriceTrendModel * model in self.priceTrendDataSource) {    [xVals addObject:[NSString stringWithFormat:@"%@",model.trend_X]];    ChartDataEntry *entry_Y = [[ChartDataEntry alloc] initWithX:index y:model.trend_Y];  [yVals addObject:entry_Y];    index ++; } LineChartDataSet *lineSet = [[LineChartDataSet alloc] initWithValues:yVals label:@""]; lineSet.mode = LineChartModeCubicBezier; lineSet.lineWidth = 1.0f; lineSet.drawValuesEnabled = NO; lineSet.valueColors = @[[UIColor purpleColor]]; //折线上的数值的颜色 [lineSet setColor:HEXCOLOR(0x24A5EA)]; //折线本身的颜色 lineSet.drawSteppedEnabled = NO;//是否开启绘制阶梯样式的折线图 lineSet.drawCirclesEnabled = NO; lineSet.drawFilledEnabled = NO;//是否填充颜色 lineSet.circleRadius = 1.0f; lineSet.drawCircleHoleEnabled = NO; lineSet.circleHoleRadius = 0.0f; lineSet.circleHoleColor = [UIColor whiteColor];  lineSet.highlightEnabled = YES;//选中拐点,是否开启高亮效果(显示十字线) //lineSet.highlightColor = HEXCOLOR(0xc83c23);//点击选中拐点的十字线的颜色 lineSet.highlightColor = [HEXCOLOR(0x444444) colorWithAlphaComponent:0.5];//点击选中拐点的十字线的颜色 lineSet.highlightLineWidth = 0.5;//十字线宽度 //lineSet.highlightLineDashLengths = @[@5,@5]; //设置十字线的虚线宽度  lineSet.valueFont = [UIFont systemFontOfSize:12]; lineSet.axisDependency = AxisDependencyLeft;  LineChartData *lineData = [[LineChartData alloc] initWithDataSet:lineSet];  return lineData;}

//初始化饼状图- (PieChartView *)pieChartView{ if (!_pieChartView) {  _pieChartView = [[PieChartView alloc] initWithFrame:CGRectZero];    _pieChartView.backgroundColor = [UIColor whiteColor];    //基本样式  //[_pieChartView setExtraOffsetsWithLeft:30 top:10 right:30 bottom:10];//饼状图距离边缘的间隙    [_pieChartView setExtraOffsetsWithLeft:0 top:0 right:0 bottom:0];//饼状图距离边缘的间隙    _pieChartView.usePercentValuesEnabled = NO;//是否根据所提供的数据, 将显示数据转换为百分比格式  _pieChartView.dragDecelerationEnabled = YES;//拖拽饼状图后是否有惯性效果  _pieChartView.drawSliceTextEnabled = NO;//是否显示区块文本    //空心样式  _pieChartView.drawHoleEnabled = YES;//饼状图是否是空心  _pieChartView.holeRadiusPercent = 0.8;//空心半径占比  _pieChartView.holeColor = [UIColor clearColor];//空心颜色  _pieChartView.transparentCircleRadiusPercent = 0.52;//半透明空心半径占比  _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    //设置空心文字    if (_pieChartView.isDrawHoleEnabled == YES) {   _pieChartView.drawCenterTextEnabled = YES;//是否显示中间文字   //普通文本   //_pieChartView.centerText = @"资产";//中间文字   //富文本   NSMutableAttributedString *centerText = [[NSMutableAttributedString alloc] initWithString:@"收支详情"];   [centerText setAttributes:@{NSFontAttributeName: [UIFont boldSystemFontOfSize:18],          NSForegroundColorAttributeName: HEXCOLOR(0x444444)}        range:NSMakeRange(0, centerText.length)];   _pieChartView.centerAttributedText = centerText;  }    //设置饼状图描述  _pieChartView.descriptionText = @"";  //_pieChartView.descriptionFont = [UIFont systemFontOfSize:10];  //_pieChartView.descriptionTextColor = [UIColor grayColor];    //设置图例样式  _pieChartView.legend.maxSizePercent = 0;//图例在饼状图中的大小占比, 这会影响图例的宽高  _pieChartView.legend.formToTextSpace = 5;//文本间隔  _pieChartView.legend.yEntrySpace = 12;//10;  _pieChartView.legend.xEntrySpace = 15;  _pieChartView.legend.font = [UIFont systemFontOfSize:10];//字体大小  _pieChartView.legend.textColor = [UIColor grayColor];//字体颜色  _pieChartView.legend.position = ChartLegendPositionBelowChartCenter;//图例在饼状图中的位置  _pieChartView.legend.form = ChartLegendFormCircle;//图示样式: 方形、线条、圆形  _pieChartView.legend.formSize = 0;//图示大小 } return _pieChartView;}

//饼状图的数据源- (PieChartData *)getPieData{  //每个区块的金额数 NSMutableArray * moneyArray = [NSMutableArray arrayWithArray:@[@33.33,@66.66]];  //每个区块的名称或描述 //NSArray * xVals = @[@"充值诚意金",@"充值会员费",@"赠送诚意金",@"赠送会员费",@"被冻结资金"];// NSMutableArray * xVals = [NSMutableArray array];  //每个区块的颜色 NSMutableArray *colors = [[NSMutableArray alloc] init];  switch (_forecastType) {  case ForecastPriceTypeUp:{   [colors addObject:HEXCOLOR(0xFF1F32)];   [moneyArray removeAllObjects];   [moneyArray addObject:@(self.forecastModel.upRate)];   [moneyArray addObject:@(1 - self.forecastModel.upRate)];   break;  }  case ForecastPriceTypeDown:{   [colors addObject:HEXCOLOR(0x5FD954)];   [moneyArray removeAllObjects];   [moneyArray addObject:@(self.forecastModel.downRate)];   [moneyArray addObject:@(1 - self.forecastModel.downRate)];   break;  }  case ForecastPriceTypeLevel:{   [colors addObject:HEXCOLOR(0x00D6F6)];   [moneyArray removeAllObjects];   [moneyArray addObject:@(self.forecastModel.rate)];   [moneyArray addObject:@(1 - self.forecastModel.rate)];   break;  }  default:   break; }  [colors addObject:HEXCOLOR(0xF2F2F2)];  //每个区块的数据 NSMutableArray *yVals = [[NSMutableArray alloc] init];  for (int i = 0; i < moneyArray.count; i++) {    double randomVal = [moneyArray[i] doubleValue];    //BarChartDataEntry *entry = [[BarChartDataEntry alloc] initWithValue:randomVal xIndex:i];    //ChartDataEntry * entry = [[ChartDataEntry alloc] initWithValue:randomVal xIndex:i];    ChartDataEntry * entry = [[ChartDataEntry alloc] initWithX:i y:randomVal];    [yVals addObject:entry]; }  //dataSet //PieChartDataSet *dataSet = [[PieChartDataSet alloc] initWithYVals:yVals label:@""]; PieChartDataSet *dataSet = [[PieChartDataSet alloc] initWithValues:yVals label:@""]; dataSet.drawValuesEnabled = NO;//是否绘制显示数据 dataSet.colors = colors;//区块颜色 dataSet.sliceSpace = 3;//相邻区块之间的间距 dataSet.selectionShift = 2;//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 dataSet.valueLineVariableLength = YES;  //data //PieChartData *data = [[PieChartData alloc] initWithXVals:xVals dataSet:dataSet]; PieChartData *data = [[PieChartData alloc] initWithDataSet:dataSet]; NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init]; formatter.numberStyle = kCFNumberFormatterDecimalStyle;//NSNumberFormatterPercentStyle; [formatter setPositiveFormat:@"###,##0.00;"]; formatter.maximumFractionDigits = 2;//小数位数 formatter.multiplier = @1.f; formatter.paddingPosition = kCFNumberFormatterPadBeforeSuffix; formatter.positiveSuffix = @"元"; //[data setValueFormatter:formatter];//设置显示数据格式 [data setValueTextColor:[UIColor brownColor]]; [data setValueFont:[UIFont systemFontOfSize:10]];  return data;}