iOS如何实现多条折线图封装

#define XYQColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0] #define XYQRandomColor XYQColor(arc4random_uniform(256), arc4random_uniform(256), arc4random_uniform(256)) #define MARGIN 30 // 坐标轴与画布间距 #define Y_EVERY_MARGIN 20 // y轴每一个值的间隔数 #import <UIKit/UIKit.h> // 线条类型 typedef NS_ENUM(NSInteger, LineType) { LineType_Straight, // 折线 LineType_Curve // 曲线 }; @interface BezierCurveView : UIView //初始化画布 +(instancetype)initWithFrame:(CGRect)frame; //画多根折线图 -(void)drawMoreLineChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues LineType:(LineType) lineType; @end

@implementation BezierCurveView //初始化画布 +(instancetype)initWithFrame:(CGRect)frame{ BezierCurveView *bezierCurveView = [[BezierCurveView alloc]init]; bezierCurveView.frame = frame; //背景视图 UIView *backView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)]; backView.backgroundColor = [UIColor clearColor]; [bezierCurveView addSubview:backView]; myFrame = frame; return bezierCurveView; }

/** * 画坐标轴 */ -(void)drawXYLine:(NSMutableArray *)x_names{ UIBezierPath *path = [UIBezierPath bezierPath]; //1.Y轴、X轴的直线 [path moveToPoint:CGPointMake(MARGIN, CGRectGetHeight(myFrame)-MARGIN)]; [path addLineToPoint:CGPointMake(MARGIN, MARGIN)]; [path moveToPoint:CGPointMake(MARGIN, CGRectGetHeight(myFrame)-MARGIN)]; [path addLineToPoint:CGPointMake(CGRectGetWidth(myFrame), CGRectGetHeight(myFrame)-MARGIN)]; // //2.添加箭头 // [path moveToPoint:CGPointMake(MARGIN, MARGIN)]; // [path addLineToPoint:CGPointMake(MARGIN-5, MARGIN+5)]; // [path moveToPoint:CGPointMake(MARGIN, MARGIN)]; // [path addLineToPoint:CGPointMake(MARGIN+5, MARGIN+5)]; // // [path moveToPoint:CGPointMake(CGRectGetWidth(myFrame), CGRectGetHeight(myFrame)-MARGIN)]; // [path addLineToPoint:CGPointMake(CGRectGetWidth(myFrame)-5, CGRectGetHeight(myFrame)-MARGIN-5)]; // [path moveToPoint:CGPointMake(CGRectGetWidth(myFrame), CGRectGetHeight(myFrame)-MARGIN)]; // [path addLineToPoint:CGPointMake(CGRectGetWidth(myFrame)-5, CGRectGetHeight(myFrame)-MARGIN+5)]; //3.添加索引格 //X轴 for (int i=0; i<x_names.count; i++) { CGFloat X = MARGIN + (CGRectGetWidth(myFrame)-30)/x_names.count*(i+1)-(CGRectGetWidth(myFrame)-30)/x_names.count/2.0; CGPoint point = CGPointMake(X,CGRectGetHeight(myFrame)-MARGIN); [path moveToPoint:point]; [path addLineToPoint:CGPointMake(point.x, point.y-3)]; } //Y轴（实际长度为200,此处比例缩小一倍使用） for (int i=0; i<11; i++) { CGFloat Y = CGRectGetHeight(myFrame)-MARGIN-Y_EVERY_MARGIN*i; CGPoint point = CGPointMake(MARGIN,Y); [path moveToPoint:point]; [path addLineToPoint:CGPointMake(point.x+3, point.y)]; } //4.添加索引格文字 //X轴 for (int i=0; i<x_names.count; i++) { CGFloat X = MARGIN + (CGRectGetWidth(myFrame)-30)/x_names.count/2.0 + (CGRectGetWidth(myFrame)-30)/x_names.count*i-(CGRectGetWidth(myFrame)-30)/x_names.count/2.0; UILabel *textLabel = [[UILabel alloc] initWithFrame:CGRectMake(X, CGRectGetHeight(myFrame)-MARGIN, (CGRectGetWidth(myFrame)-60)/x_names.count, 20)]; textLabel.text = x_names[i]; textLabel.font = [UIFont systemFontOfSize:10]; textLabel.textAlignment = NSTextAlignmentCenter; textLabel.textColor = [UIColor blueColor]; [self addSubview:textLabel]; } //Y轴 for (int i=0; i<11; i++) { CGFloat Y = CGRectGetHeight(myFrame)-MARGIN-Y_EVERY_MARGIN*i; UILabel *textLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, Y-5, MARGIN, 10)]; textLabel.text = [NSString stringWithFormat:@"%d",10*i]; textLabel.font = [UIFont systemFontOfSize:10]; textLabel.textAlignment = NSTextAlignmentCenter; textLabel.textColor = [UIColor redColor]; [self addSubview:textLabel]; } //5.渲染路径 CAShapeLayer *shapeLayer = [CAShapeLayer layer]; shapeLayer.path = path.CGPath; shapeLayer.strokeColor = [UIColor blackColor].CGColor; shapeLayer.fillColor = [UIColor clearColor].CGColor; shapeLayer.borderWidth = 2.0; [self.subviews[0].layer addSublayer:shapeLayer]; }

/** * 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]; } }

//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];

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