iOS使用Charts框架绘制折线图

self.LineChartView = [[LineChartView alloc] init];
self.LineChartView.delegate = self;//设置代理
[self.view addSubview:self.LineChartView];
[self.LineChartView mas_makeConstraints:^(MASConstraintMaker *make) {
 make.size.mas_equalTo(CGSizeMake(self.view.bounds.size.width-20, 300));
 make.center.mas_equalTo(self.view);
}];
self.LineChartView.backgroundColor = [UIColor colorWithRed:230/255.0f green:253/255.0f blue:253/255.0f alpha:1];
self.LineChartView.noDataText = @"暂无数据";

self.LineChartView.scaleYEnabled = NO;//取消Y轴缩放
self.LineChartView.doubleTapToZoomEnabled = NO;//取消双击缩放
self.LineChartView.dragEnabled = YES;//启用拖拽图标
self.LineChartView.dragDecelerationEnabled = YES;//拖拽后是否有惯性效果
self.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

ChartXAxis *xAxis = self.LineChartView.xAxis;
xAxis.axisLineWidth = 1.0/[UIScreen mainScreen].scale;//设置X轴线宽
xAxis.labelPosition = XAxisLabelPositionBottom;//X轴的显示位置，默认是显示在上面的
xAxis.drawGridLinesEnabled = NO;//不绘制网格线
xAxis.spaceBetweenLabels = 4;//设置label间隔
xAxis.labelTextColor = [self colorWithHexString:@"#057748"];//label文字颜色

self.LineChartView.rightAxis.enabled = NO;//不绘制右边轴
ChartYAxis *leftAxis = self.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label
leftAxis.showOnlyMinMaxEnabled = NO;//是否只显示最大值和最小值
leftAxis.axisMinValue = 0;//设置Y轴的最小值
leftAxis.startAtZeroEnabled = YES;//从0开始绘制
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.axisLineWidth = 1.0/[UIScreen mainScreen].scale;//Y轴线宽
leftAxis.axisLineColor = [UIColor blackColor];//Y轴颜色
leftAxis.valueFormatter = [[NSNumberFormatter alloc] init];//自定义格式
leftAxis.valueFormatter.positiveSuffix = @" $";//数字后缀单位
leftAxis.labelPosition = YAxisLabelPositionOutsideChart;//label位置
leftAxis.labelTextColor = [self colorWithHexString:@"#057748"];//文字颜色
leftAxis.labelFont = [UIFont systemFontOfSize:10.0f];//文字字体

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

ChartLimitLine *limitLine = [[ChartLimitLine alloc] initWithLimit:80 label:@"限制线"];
limitLine.lineWidth = 2;
limitLine.lineColor = [UIColor greenColor];
limitLine.lineDashLengths = @[@5.0f, @5.0f];//虚线样式
limitLine.labelPosition = ChartLimitLabelPositionRightTop;//位置
limitLine.valueTextColor = [self colorWithHexString:@"#057748"];//label文字颜色
limitLine.valueFont = [UIFont systemFontOfSize:12];//label字体
[leftAxis addLimitLine:limitLine];//添加到Y轴上
leftAxis.drawLimitLinesBehindDataEnabled = YES;//设置限制线绘制在折线图的后面

[self.LineChartView setDescriptionText:@"折线图"];//折线图描述
[self.LineChartView setDescriptionTextColor:[UIColor darkGrayColor]];
self.LineChartView.legend.form = ChartLegendFormLine;//图例的样式
self.LineChartView.legend.formSize = 30;//图例中线条的长度
self.LineChartView.legend.textColor = [UIColor darkGrayColor];//图例文字颜色

- (LineChartData *)setData{
 int xVals_count = 12;//X轴上要显示多少条数据
 double maxYVal = 100;//Y轴的最大值
 //X轴上面需要显示的数据
 NSMutableArray *xVals = [[NSMutableArray alloc] init];
 for (int i = 0; i < xVals_count; i++) {
 [xVals addObject:[NSString stringWithFormat:@"%d月", i+1]];
 }
 //对应Y轴上面需要显示的数据
 NSMutableArray *yVals = [[NSMutableArray alloc] init];
 for (int i = 0; i < xVals_count; i++) {
 double mult = maxYVal + 1;
 double val = (double)(arc4random_uniform(mult));
 ChartDataEntry *entry = [[ChartDataEntry alloc] initWithValue:val xIndex:i];
 [yVals addObject:entry];
 }
 LineChartDataSet *set1 = nil;
 if (self.LineChartView.data.dataSetCount > 0) {
 LineChartData *data = (LineChartData *)self.LineChartView.data;
 set1 = (LineChartDataSet *)data.dataSets[0];
 set1.yVals = yVals;
 return data;
 }else{
 //创建LineChartDataSet对象
 set1 = [[LineChartDataSet alloc] initWithYVals:yVals label:@"lineName"];
 //设置折线的样式
 set1.lineWidth = 1.0/[UIScreen mainScreen].scale;//折线宽度
 set1.drawValuesEnabled = YES;//是否在拐点处显示数据
 set1.valueColors = @[[UIColor brownColor]];//折线拐点处显示数据的颜色
 [set1 setColor:[self colorWithHexString:@"#007FFF"]];//折线颜色
 set1.drawSteppedEnabled = NO;//是否开启绘制阶梯样式的折线图
 //折线拐点样式
 set1.drawCirclesEnabled = NO;//是否绘制拐点
 set1.circleRadius = 4.0f;//拐点半径
 set1.circleColors = @[[UIColor redColor], [UIColor greenColor]];//拐点颜色
 //拐点中间的空心样式
 set1.drawCircleHoleEnabled = YES;//是否绘制中间的空心
 set1.circleHoleRadius = 2.0f;//空心的半径
 set1.circleHoleColor = [UIColor blackColor];//空心的颜色
 //折线的颜色填充样式
 //第一种填充样式:单色填充
// set1.drawFilledEnabled = YES;//是否填充颜色
// set1.fillColor = [UIColor redColor];//填充颜色
// set1.fillAlpha = 0.3;//填充颜色的透明度
 //第二种填充样式:渐变填充
 set1.drawFilledEnabled = YES;//是否填充颜色
 NSArray *gradientColors = @[(id)[ChartColorTemplates colorFromString:@"#FFFFFFFF"].CGColor,
   (id)[ChartColorTemplates colorFromString:@"#FF007FFF"].CGColor];
 CGGradientRef gradientRef = CGGradientCreateWithColors(nil, (CFArrayRef)gradientColors, nil);
 set1.fillAlpha = 0.3f;//透明度
 set1.fill = [ChartFill fillWithLinearGradient:gradientRef angle:90.0f];//赋值填充颜色对象
 CGGradientRelease(gradientRef);//释放gradientRef
 //点击选中拐点的交互样式
 set1.highlightEnabled = YES;//选中拐点,是否开启高亮效果(显示十字线)
 set1.highlightColor = [self colorWithHexString:@"#c83c23"];//点击选中拐点的十字线的颜色
 set1.highlightLineWidth = 1.0/[UIScreen mainScreen].scale;//十字线宽度
 set1.highlightLineDashLengths = @[@5, @5];//十字线的虚线样式
 //将 LineChartDataSet 对象放入数组中
 NSMutableArray *dataSets = [[NSMutableArray alloc] init];
 [dataSets addObject:set1];
 //添加第二个LineChartDataSet对象
// LineChartDataSet *set2 = [set1 copy];
// NSMutableArray *yVals2 = [[NSMutableArray alloc] init];
// for (int i = 0; i < xVals_count; i++) {
// double mult = maxYVal + 1;
// double val = (double)(arc4random_uniform(mult));
// ChartDataEntry *entry = [[ChartDataEntry alloc] initWithValue:val xIndex:i];
// [yVals2 addObject:entry];
// }
// set2.yVals = yVals2;
// [set2 setColor:[UIColor redColor]];
// set2.drawFilledEnabled = YES;//是否填充颜色
// set2.fillColor = [UIColor redColor];//填充颜色
// set2.fillAlpha = 0.1;//填充颜色的透明度
// [dataSets addObject:set2];
 //创建 LineChartData 对象, 此对象就是lineChartView需要最终数据对象
 LineChartData *data = [[LineChartData alloc] initWithXVals:xVals dataSets:dataSets];
 [data setValueFont:[UIFont fontWithName:@"HelveticaNeue-Light" size:8.f]];//文字字体
 [data setValueTextColor:[UIColor grayColor]];//文字颜色
 NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
 //自定义数据显示格式
 [formatter setNumberStyle:NSNumberFormatterDecimalStyle];
 [formatter setPositiveFormat:@"#0.0"];
 [data setValueFormatter:formatter];
 return data;
 }
}