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;
}