本篇文章给大家分享的是有关iOS中怎么实现一个精美的图表，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
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1.集成Charts
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;
}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;
}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行业资讯频道。
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