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iOS实现的多条折线图封装实例

2019年07月24日  | 移动技术网IT编程  | 我要评论

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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];
}
/**
 * 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];

总结

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