iOS 折线图、柱状图的简单实现

首先我得感谢某位博主，非常抱歉，因为之前直接下载博主提供这篇文章的demo，然后去研究了，没记住博主的名字。再次非常感谢。

而这个dome我又修改了一些，完善了一些不美观的bug，当然还有，后面会陆续更新。

1 、一开始需要给坐标轴初始一个画布

//初始化画布
+(instancetype)initWithFrame:(CGRect)frame{
    //找到名称叫BezierCurveView的xib视图
    BezierCurveView *bezierCurveView = [[NSBundle mainBundle] loadNibNamed:@"BezierCurveView" owner:self options:nil].lastObject;
    bezierCurveView.frame = frame;
    
    //背景视图
    UIView *backView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];
    backView.backgroundColor = XYQColor(255, 229, 239);
    [bezierCurveView addSubview:backView];
    
    myFrame = frame;
    return bezierCurveView;
}

2、然后画坐标轴，包括x、y轴的直线、箭头、字符串的索引、路径的渲染。

/**
 *  画坐标轴
 */
-(void)drawXYLine:(NSMutableArray *)x_names AdddistanceValues:(NSInteger )adddistance StartingValues:(NSInteger)starting ProportionValuess:(NSInteger)proportion{
    
    UIBezierPath *path = [UIBezierPath bezierPath];
    
    //1.Y轴、X轴的直线
    [path moveToPoint:CGPointMake(MARGIN+adddistance, CGRectGetHeight(myFrame)-MARGIN)];
    [path addLineToPoint:CGPointMake(MARGIN+adddistance, MARGIN)];
    
    [path moveToPoint:CGPointMake(MARGIN+adddistance, CGRectGetHeight(myFrame)-MARGIN)];
    [path addLineToPoint:CGPointMake(MARGIN+CGRectGetWidth(myFrame)-2*MARGIN+adddistance, CGRectGetHeight(myFrame)-MARGIN)];
    
    //2.添加箭头
    [path moveToPoint:CGPointMake(MARGIN+adddistance, MARGIN)];
    [path addLineToPoint:CGPointMake(MARGIN-5+adddistance, MARGIN+5)];
    [path moveToPoint:CGPointMake(MARGIN+adddistance, MARGIN)];
    [path addLineToPoint:CGPointMake(MARGIN+5+adddistance, MARGIN+5)];
    
    [path moveToPoint:CGPointMake(MARGIN+CGRectGetWidth(myFrame)-2*MARGIN+adddistance, CGRectGetHeight(myFrame)-MARGIN)];
    [path addLineToPoint:CGPointMake(MARGIN+CGRectGetWidth(myFrame)-2*MARGIN-5+adddistance, CGRectGetHeight(myFrame)-MARGIN-5)];
    [path moveToPoint:CGPointMake(MARGIN+CGRectGetWidth(myFrame)-2*MARGIN+adddistance, CGRectGetHeight(myFrame)-MARGIN)];
    [path addLineToPoint:CGPointMake(MARGIN+CGRectGetWidth(myFrame)-2*MARGIN-5+adddistance, CGRectGetHeight(myFrame)-MARGIN+5)];

    //3.添加索引格
    //X轴
    for (int i=0; i<x_names.count; i++) {
        CGFloat X = MARGIN + MARGIN*(i+1);
        CGPoint point = CGPointMake(X+adddistance,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+adddistance,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+1; i++) {
        CGFloat X = MARGIN + 15 + MARGIN*i;
        UILabel *textLabel = [[UILabel alloc] initWithFrame:CGRectMake(X+adddistance, CGRectGetHeight(myFrame)-MARGIN, MARGIN, 20)];
        if(i < x_names.count){
            textLabel.text = x_names[i];
        }
        else{
            textLabel.text = @"年/月";
        }
        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+adddistance, 10)];
        textLabel.text = [NSString stringWithFormat:@"%ld",starting+proportion*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];
}

3、实现的方法

/**
 *  画折线图
 *  @param x_names      x轴值的所有值名称
 *  @param targetValues 所有目标值
 *  @param lineType     直线类型
 *  @param adddistance  y轴的字符串长度的增加距离
 *  @param starting     坐标轴原点的大小数值
 *  @param proportion   y轴上的数值比例差为10的倍数
 */
-(void)drawLineChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues LineType:(LineType) lineType AdddistanceValues:(NSInteger )adddistance  StartingValues:(NSInteger)starting ProportionValuess:(NSInteger)proportion;
/**
 *  画柱状图
 *  @param x_names      x轴值的所有值名称
 *  @param targetValues 所有目标值
 *  @param adddistance  y轴的字符串长度的增加距离
 *  @param starting     坐标轴原点的大小数值
 *  @param proportion   y轴上的数值比例差为10的倍数
 */
-(void)drawBarChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues AdddistanceValues:(NSInteger )adddistance  StartingValues:(NSInteger)starting ProportionValuess:(NSInteger)proportion;

4、折线图的实现

/**
 *  画折线图
 */
-(void)drawLineChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues LineType:(LineType) lineType AdddistanceValues:(NSInteger )adddistance  StartingValues:(NSInteger)starting ProportionValuess:(NSInteger)proportion{
    
    //1.画坐标轴
    [self drawXYLine:x_names AdddistanceValues:adddistance StartingValues:starting ProportionValuess:proportion];
    NSMutableArray * targetValues1 =[[NSMutableArray alloc]init];
    for (int i=0; i<targetValues.count; i++  ){
        CGFloat coed =[targetValues[i] integerValue];
        [targetValues1 addObject:@((coed-starting)/proportion)];

    }
   
    //2.获取目标值点坐标
    NSMutableArray *allPoints = [NSMutableArray array];
    for (int i=0; i<targetValues1.count; i++) {
        CGFloat doubleValue = 2*[targetValues1[i] floatValue]; //目标值放大两倍
        CGFloat X = MARGIN+adddistance + MARGIN*(i+1);
        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 = [UIColor greenColor].CGColor;
    shapeLayer.fillColor = [UIColor clearColor].CGColor;
    shapeLayer.borderWidth = 2.0;
    [self.subviews[0].layer addSublayer:shapeLayer];
    
    //4.添加目标值文字
    for (int i =0; i<allPoints.count; i++) {
        UILabel *label = [[UILabel alloc] init];
        label.textColor = [UIColor purpleColor];
        label.textAlignment = NSTextAlignmentCenter;
        label.font = [UIFont systemFontOfSize:10];
        [self.subviews[0] addSubview:label];
        
        if (i==0) {
            CGPoint NowPoint = [allPoints[0] CGPointValue];
            label.text = [NSString stringWithFormat:@"%.0lf",starting+proportion*(CGRectGetHeight(myFrame)-NowPoint.y-MARGIN)/2];
            label.frame = CGRectMake(NowPoint.x-MARGIN/2, NowPoint.y-20, MARGIN+adddistance, 20);
            PrePonit = NowPoint;
        }else{
            CGPoint NowPoint = [allPoints[i] CGPointValue];
            if (NowPoint.y<PrePonit.y) {  //文字置于点上方
                label.frame = CGRectMake(NowPoint.x-MARGIN/2, NowPoint.y-20, MARGIN+adddistance, 20);
            }else{ //文字置于点下方
                label.frame = CGRectMake(NowPoint.x-MARGIN/2, NowPoint.y, MARGIN+adddistance, 20);
            }
            
            label.text = [NSString stringWithFormat:@"%.0lf",starting+proportion*(CGRectGetHeight(myFrame)-NowPoint.y-MARGIN)/2];
       
            PrePonit = NowPoint;
        }
    }
}

5、柱状图的实现

/**
 *  画柱状图
 */
-(void)drawBarChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues AdddistanceValues:(NSInteger )adddistance  StartingValues:(NSInteger)starting ProportionValuess:(NSInteger)proportion{
    
    //1.画坐标轴
    
    [self drawXYLine:x_names AdddistanceValues:adddistance StartingValues:starting ProportionValuess:proportion];
    NSMutableArray * targetValues1 =[[NSMutableArray alloc]init];
    for (int i=0; i<targetValues.count; i++  ){
        CGFloat coed =[targetValues[i] integerValue];
        [targetValues1 addObject:@((coed-starting)/proportion)];
       
    }
    //2.每一个目标值点坐标
    for (int i=0; i<targetValues1.count; i++) {
        CGFloat doubleValue = 2*[targetValues1[i] floatValue]; //目标值放大两倍
        CGFloat X = MARGIN + MARGIN*(i+1)+5;
        CGFloat Y = CGRectGetHeight(myFrame)-MARGIN-doubleValue;
        UIBezierPath *path = [UIBezierPath bezierPathWithRect:CGRectMake(X-MARGIN/2+adddistance, 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+adddistance*2, 20)];
        label.text = [NSString stringWithFormat:@"%.0lf",starting+proportion*(CGRectGetHeight(myFrame)-Y-MARGIN)/2];
        label.textColor = [UIColor purpleColor];
        label.textAlignment = NSTextAlignmentCenter;
        label.font = [UIFont systemFontOfSize:10];
        [self.subviews[0] addSubview:label];
    }
}

6、父视图view部分代码

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.layer.backgroundColor=[UIColor whiteColor].CGColor;
    //1.初始化
    self.bezierView = [BezierCurveView initWithFrame:CGRectMake(20, 30, SCREEN_W-40, 280)];
    self.bezierView.center = self.view.center;
    [self.view addSubview:self.bezierView];
    //2.折线图
   // [self drawLineChart];
    //3.柱状图
  //  [self drawBaseChart];
}

//画折线图
-(void)drawLineChart{
    
    //直线
    //    [self.bezierView drawLineChartViewWithX_Value_Names:self.x_names TargetValues:self.targets LineType:LineType_Straight AdddistanceValues:20  StartingValues:120000 ProportionValuess:100];

   // [self.bezierView drawLineChartViewWithX_Value_Names:self.x_names TargetValues:self.targets LineType:LineType_Curve AdddistanceValues:10  StartingValues:50000 ProportionValuess:100];
   // [self.bezierView drawLineChartViewWithX_Value_Names:self.x_names TargetValues:self.targets LineType:LineType_Curve AdddistanceValues:20  StartingValues:120000 ProportionValuess:100];
}

7、iponexr演示结果图片