iOS实现的多条折线图封装实例

/**
 * 画多根折线图
 */
-(void)drawMoreLineChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues LineType:(LineType) lineType{

 //1.画坐标轴
 [self drawXYLine:x_names];

 for (int j=0; j<targetValues.count; j++) {
 //2.获取目标值点坐标
 NSMutableArray *allPoints = [NSMutableArray array];
 for (int i=0; i<[targetValues[j] count]; i++) {
  CGFloat doubleValue = 2*[targetValues[j][i] floatValue]; //目标值放大两倍
  CGFloat X = MARGIN + (CGRectGetWidth(myFrame)-30)/x_names.count*(i+1)-(CGRectGetWidth(myFrame)-30)/x_names.count/2.0;
  CGFloat Y = CGRectGetHeight(myFrame)-MARGIN-doubleValue;
  CGPoint point = CGPointMake(X,Y);
  UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(point.x-1, point.y-1, 2.5, 2.5) cornerRadius:2.5];
  CAShapeLayer *layer = [CAShapeLayer layer];
  layer.strokeColor = [UIColor purpleColor].CGColor;
  layer.fillColor = [UIColor purpleColor].CGColor;
  layer.path = path.CGPath;
  [self.subviews[0].layer addSublayer:layer];
  [allPoints addObject:[NSValue valueWithCGPoint:point]];
 }

 //3.坐标连线
 UIBezierPath *path = [UIBezierPath bezierPath];
 [path moveToPoint:[allPoints[0] CGPointValue]];

 CGPoint PrePonit;
 switch (lineType) {
  case LineType_Straight: //直线
  for (int i =1; i<allPoints.count; i++) {
   CGPoint point = [allPoints[i] CGPointValue];
   [path addLineToPoint:point];
  }
  break;
  case LineType_Curve: //曲线
  for (int i =0; i<allPoints.count; i++) {
   if (i==0) {
   PrePonit = [allPoints[0] CGPointValue];
   }else{
   CGPoint NowPoint = [allPoints[i] CGPointValue];
   [path addCurveToPoint:NowPoint controlPoint1:CGPointMake((PrePonit.x+NowPoint.x)/2, PrePonit.y) controlPoint2:CGPointMake((PrePonit.x+NowPoint.x)/2, NowPoint.y)]; //三次曲线
   PrePonit = NowPoint;
   }
  }
  break;
 }

 CAShapeLayer *shapeLayer = [CAShapeLayer layer];
 shapeLayer.path = path.CGPath;
 shapeLayer.strokeColor = XYQRandomColor.CGColor;
 shapeLayer.fillColor = [UIColor clearColor].CGColor;
 shapeLayer.borderWidth = 2.0;
 [self.subviews[0].layer addSublayer:shapeLayer];
 }
}

#define SCREEN_W [UIScreen mainScreen].bounds.size.width
#define SCREEN_H [UIScreen mainScreen].bounds.size.height

 //1.初始化
 _bezierView = [BezierCurveView initWithFrame:CGRectMake(30, 30, SCREEN_W-60, 280)];
 _bezierView.center = self.view.center;
 [self.view addSubview:_bezierView];
 // 多根折线图
 [_bezierView drawMoreLineChartViewWithX_Value_Names:(NSMutableArray *)@[@"语文",@"数学",@"英语",@"物理",@"化学",@"生物",@"政治",@"历史",@"地理"] TargetValues:(NSMutableArray *)@[@[@60,@20,@50,@30,@90,@30,@100,@70, @20],@[@20,@40,@20,@50,@30,@90,@30,@100,@70],@[@10,@30,@40,@70,@50,@30,@20,@10,@80]] LineType:LineType_Straight];