iOS中怎么实现一个精美的图表-创新互联
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这里只是做一个简略说明,具体的可以参考官方的集成方法 Charts
如果使用的Swift开发,可以直接import Charts
如果使用OC开发,则需要混编,建立ProjectName-Bridging-Header.h桥接文件,这里详细介绍混编开发
利用CocoaPods,在Podfile文件中写入 : pod 'Charts',然后pod install
在桥接文件中@import Charts;
在需要使用Charts的文件中,#import "ProjectName-Bridging-Header.h",就可以使用Charts中的代码了
2.折线图
//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; }
3.饼状图
//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; }
以上就是iOS中怎么实现一个精美的图表,小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联网站建设公司行业资讯频道。
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分享标题:iOS中怎么实现一个精美的图表-创新互联
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