前言
有时候我们在处理一些数据的时候，需要用到折线图来呈现数据，让用户能够对数据更加清晰明，本文主要给大家介绍了关于iOS实现多条折线图的相关内容，下面话不多说，来看看详细的介绍吧。
效果图如下：
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];
}
