IOS柱状图

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>
@interface BezierCurveView : UIView

//初始化画布
+(instancetype)initWithFrame:(CGRect)frame;
/**
 *  画柱状图
 *  @param x_names      x轴值的所有值名称
 *  @param targetValues 所有目标值
 */
-(void)drawBarChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues;
@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)-60)/x_names.count*(i+1);
        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)-60)/x_names.count/2.0 + (CGRectGetWidth(myFrame)-60)/x_names.count*i;
        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];
}

/**
 *  画柱状图
 */
-(void)drawBarChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues{
    
    //1.画坐标轴
    [self drawXYLine:x_names];
    
    //2.每一个目标值点坐标
    for (int i=0; i<targetValues.count; i++) {
        CGFloat doubleValue = 2*[targetValues[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;
        UIBezierPath *path = [UIBezierPath bezierPathWithRect:CGRectMake(X-MARGIN/2, Y, MARGIN-10, doubleValue)];
        CAShapeLayer *shapeLayer = [CAShapeLayer layer];
        shapeLayer.path = path.CGPath;
        shapeLayer.strokeColor = [UIColor clearColor].CGColor;
        shapeLayer.fillColor = XYQRandomColor.CGColor;
        shapeLayer.borderWidth = 2.0;
        [self.subviews[0].layer addSublayer:shapeLayer];
        
        //3.添加文字
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(X-MARGIN/2, Y-20, MARGIN-10, 20)];
        label.text = [NSString stringWithFormat:@"%.0lf",(CGRectGetHeight(myFrame)-Y-MARGIN)/2];
        label.textColor = [UIColor purpleColor];
        label.textAlignment = NSTextAlignmentCenter;
        label.font = [UIFont systemFontOfSize:10];
        [self.subviews[0] addSubview:label];
    }
}

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 drawBarChartViewWithX_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]];