IOS画多根折线图

1、封装类
.h

#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

.m

#import "BezierCurveView.h"

static CGRect myFrame;

@interface BezierCurveView ()

@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];
    }
}

2、调用

#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];

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