折线图-带阴影

lineGraphSingle.png

LineGraph.png

源码 参考

在iOS开发的各种app中,会有项目要求我们去做折线去展示我们最近数据,下面跟大家介绍下如何根据数据在IOS 端进行绘制折线图

下面开始介绍如何绘制折线图，达到以上的效果。

第一步:数据传递,这里很简单 Y 坐标的数据,线的颜色值得数组.

 
 
 
  
(void)LineGraphViewY_datasArray:(NSArray *)y_datasArray andColoreLines:(NSArray *)coloreLines;
 

第二步:绘制X 轴 坐标,Y轴坐标

 
  
 
(instancetype)initWithFrame:(CGRect)frame{
 self = [super initWithFrame:frame];
 if (self) {
 self.backgroundColor = [UIColor blackColor];
 for (int i= 0; i < YData; i++) {
 CGFloat lineX = SpacingToLeft;
 CGFloat lineY = i * SpacingHeight + SpacingToTop;
 CGFloat lineW = self.frame.size.width - 2 * lineX;
 CGFloat lineH = 0.5;
 
      UILabel \*line = [[UILabel alloc] initWithFrame:CGRectMake(lineX, lineY, lineW, lineH)];
      
      line.backgroundColor = [UIColor whiteColor];
      if (i != 0) line.alpha = 0.3;
      [self addSubview:line];
      
      
      CGFloat y_datasX = 0;
      CGFloat y_datasY = lineY - 5;
      CGFloat y_datasW = SpacingToLeft;
      CGFloat y_datasH = 10;
      
      UILabel \*y_datas = [[UILabel alloc] initWithFrame:CGRectMake(y_datasX, y_datasY, y_datasW, y_datasH)];
      y_datas.tag = 100 + i;
      y_datas.textAlignment = NSTextAlignmentCenter;
      y_datas.textColor = [UIColor whiteColor];
      y_datas.text = [NSString stringWithFormat:@"%d",i];
      y_datas.font = [UIFont systemFontOfSize:9];
      [self addSubview:y_datas];
      
  }
  // 下面的月份
  NSArray \*arr = @[@"一月",@"二月",@"三月",@"四月",@"五月",@"六月",@"七月"];
  for (int i = 0; i < arr.count; i++) {
      
      CGFloat x_datasW = (self.frame.size.width - 2 \* SpacingToLeft)/arr.count;
      CGFloat x_datasX = SpacingToLeft + i \* x_datasW;
      CGFloat x_datasY = LineGraphHeight;
      CGFloat x_datasH = 10;
      UILabel \*x_datas = [[UILabel alloc] initWithFrame:CGRectMake(x_datasX, x_datasY, x_datasW, x_datasH)];
      x_datas.textColor = [UIColor whiteColor];
      x_datas.font = [UIFont systemFontOfSize:9];
      x_datas.textAlignment = NSTextAlignmentLeft;
      x_datas.text = arr[i];
      [self addSubview:x_datas];
  }
 
}
 return self;
 }
 

计算最大值,最小值 坐标,及数据

 /**
 设置label
 @param points 最大值 最小值的坐标
 */
 
 
 
  
 
(void)setTitleLabel:(NSArray *)points andMaxMin:(NSArray *)maxMin{
 
CGFloat labelW = 100;
 CGFloat labelH = 9;
 for (int i = 0; i < points.count; i++) {
 CGPoint point = [points[i] CGPointValue];
 UILabel * label = [[UILabel alloc] init];
 label.font = [UIFont systemFontOfSize:9];
 label.textColor = [UIColor whiteColor];
 label.frame = CGRectMake(point.x+5, point.y+5, labelW, labelH);
 label.text = [NSString stringWithFormat:@"%@",maxMin[i]];
 [self addSubview:label];
 }
 
 
 
 
 
}
 /**
 得到每组数据的最大值坐标
 
 
@param points 每组数据
 */
 
 
 
  
(CGPoint )getEachGroupMax:(NSArray *)points{
 CGFloat max = 0;
 CGPoint POINT = CGPointZero;
 for (int i = 0 ; i < points.count; i++) {
 CGPoint point = [[points objectAtIndex:i] CGPointValue];
 CGFloat pointY = point.y - 12;
 if (max < pointY) {
 max = pointY;
 POINT = CGPointMake(start * i + SpacingToLeft, max - 10);
 }
 }
 return POINT;
 }
 
 
 
 
/**
 得到每组数据的最大值
 传进来的数组
 */
 
 
 
  
 
(void)getEachGroupDatasMax:(NSArray *)arr{
 
for (int i = 0; i < arr.count; i++) {
 NSArray *points = arr[i];
 CGFloat max = 0;
 NSString *maxString = nil;
 for (int y = 0 ; y < points.count; y++) {
 CGFloat pointY = [[points objectAtIndex:y] floatValue];
 if (max < pointY) {
 max = pointY;
 maxString = points[y];
 }
 }
 [self.maxDatas addObject:maxString];
 
}
 }
 
 
 
 
 
/**
 
 
得到每组数据的最小值
 @param arr 传进来的数据
 
 
*/
 
 
 
  
 
(void)getEachGroupDatasMin:(NSArray *)arr{
 
for (int i = 0; i < arr.count; i++) {
 NSArray *points = arr[i];
 
  CGFloat min = 999999999;
  NSString \*minString = nil;
  
  for (int y = 0 ; y < points.count; y++) {
      CGFloat pointY = [[points objectAtIndex:y] floatValue];
      
      if (min > pointY) {
          min = pointY;
          minString = points[y];
      }
  }
  [self.minDatas addObject:minString];
 
}
 }
 /**
 得到每组数据的最小值
 
 
 
 
 
@param points 每组数组
 
 
@return 最小值
 */
 
 
 
  
 
(CGPoint)getEachGroupMin:(NSArray *)points{
 CGFloat min = 999999999;
 CGPoint POINT = CGPointZero;
 
for (int i = 0 ; i < points.count; i++) {
 CGPoint point = [[points objectAtIndex:i] CGPointValue];
 CGFloat pointY = point.y - 12;
 
  if (min > pointY) {
      min = pointY;
      POINT = CGPointMake(start \* i + SpacingToLeft + 2, min);
  }
 
}
 return POINT;
 }
 
 
 
 
 

中间有较多计算坐标的代码,在这里就不多说了,开头有github 下载地址 可以去参考.

第三步:绘制折线

 /**
 绘制折线
 */
 
 
 
  
 
(void)drawBrokenLine:(NSArray *)points andLineColor:(UIColor *)lineColor{
 
UIBezierPath *linePath = [UIBezierPath bezierPath];
 
[linePath setLineCapStyle:kCGLineCapRound];
 [linePath setLineJoinStyle:kCGLineJoinRound];
 // 起点
 
[linePath moveToPoint:CGPointMake(SpacingToLeft, [[points objectAtIndex:0] floatValue]+ _dotH * 0.5)];
 // 其他点
 
for (int i = 1; i < points.count; i++) {
 CGFloat xPosition = start * i + SpacingToLeft;
 CGFloat yPosition = [[points objectAtIndex:i] floatValue] + _dotH * 0.5;
 
  [linePath addLineToPoint:CGPointMake(xPosition, yPosition)];
 
}
 
CAShapeLayer *lineLayer = [CAShapeLayer layer];
 
// 设置虚线
 lineLayer.lineDashPattern = [NSArray arrayWithObjects:@4,@2, nil];
 lineLayer.lineWidth = 1;
 lineLayer.strokeColor = lineColor.CGColor;
 lineLayer.path = linePath.CGPath;
 lineLayer.fillColor = [UIColor clearColor].CGColor; // 默认为blackColor
 
[self.layer addSublayer:lineLayer];
 
 
 
 
 
CABasicAnimation \*pathAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
pathAnimation.duration = 2.0;
pathAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
pathAnimation.fromValue = [NSNumber numberWithFloat:0.0f];
pathAnimation.toValue = [NSNumber numberWithFloat:1.0f];
pathAnimation.autoreverses = NO;
[lineLayer addAnimation:pathAnimation forKey:@"strokeEndAnimation"];
 
 
}
 

第四部:绘制阴影

 // 绘制阴影
 
 
 
  
 
(void)drawRect:(CGRect)rect {
 
for (int i = 0; i < self.datas.count; i++) {
 
  NSArray \* arr = self.datas[i];
  
  if (!arr || [arr count]<=0) return;
  
  CGContextRef context = UIGraphicsGetCurrentContext();
  CGContextSaveGState(context);
  {
      //先画出要裁剪的区域
      CGPoint firstPoint = [[arr objectAtIndex:0] CGPointValue];
      CGContextMoveToPoint(context, firstPoint.x, self.frame.size.height);
      CGContextSetLineWidth(context, 2);
      for (int i=0; i<[arr count]; i++) {
          //画中间的区域
          CGPoint point = [[arr objectAtIndex:i] CGPointValue];
          CGContextAddLineToPoint(context, point.x, point.y);
      }
      CGPoint lastPoint = [[arr objectAtIndex:([arr count]-1)] CGPointValue];
      {
          //画边框
          CGContextAddLineToPoint(context, lastPoint.x, self.frame.size.height);
          
          CGContextAddLineToPoint(context, self.frame.size.width, self.frame.size.height);
          CGContextAddLineToPoint(context, self.frame.size.width, 0);
          CGContextAddLineToPoint(context, 0, 0);
          CGContextAddLineToPoint(context, 0, self.frame.size.height);
      }
      
      CGContextClosePath(context);
      CGContextAddRect(context, CGContextGetClipBoundingBox(context));
      CGContextEOClip(context);
      //裁剪
      CGContextMoveToPoint(context, firstPoint.x, 0);
      CGContextAddLineToPoint(context, firstPoint.x, LineGraphHeight);
      CGContextSetLineWidth(context,self.frame.size.width\*2);
      CGContextReplacePathWithStrokedPath(context);
      CGContextClip(context);
      //填充渐变
      CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB();
      if (i == 0) {
          CGFloat colors[] = {
              68/255.0,192/255.0,254/255.0,0.6,
              68/255.0,192/255.0,254/255.0,0.0,
              68/255.0,192/255.0,254/255.0,0.0
          };
          CGGradientRef gradient = CGGradientCreateWithColorComponents(rgb, colors, NULL, 2);
          CGContextDrawLinearGradient(context, gradient, CGPointMake(firstPoint.x, 0), CGPointMake(firstPoint.x, self.frame.size.height), 0);
          CGGradientRelease(gradient);
      }
      else
      {
          CGFloat colors[] = {
              239/255.0,0/255.0,180/255.0,0.6,
              239/255.0,0/255.0,180/255.0,0.0,
              239/255.0,0/255.0,180/255.0,0.0
          };
          CGGradientRef gradient = CGGradientCreateWithColorComponents(rgb, colors, NULL, 2);
          CGContextDrawLinearGradient(context, gradient, CGPointMake(firstPoint.x, 0), CGPointMake(firstPoint.x, self.frame.size.height), 0);
          CGGradientRelease(gradient);
      }
  }
  CGContextRestoreGState(context);
 
}
 }
 

使用方法

 LineGraphView *lineGraph = [[LineGraphView alloc] initWithFrame:CGRectMake(0, 0, lineGraphW, lineGraphH)];
 [self.view addSubview:lineGraph];
 [lineGraph LineGraphViewY_datasArray:@[@[@"222",@"50",@"100",@"70",@"260",@"10",@"150"]] andColoreLines:@[[UIColor redColor]]];
 

 LineGraphView *lineGraph = [[LineGraphView alloc] initWithFrame:CGRectMake(0, 0, lineGraphW, lineGraphH)];
 [self.view addSubview:lineGraph];
 [lineGraph LineGraphViewY_datasArray:@[@[@"250",@"180",@"55",@"200",@"70",@"1000",@"88"],@[@"222",@"50",@"100",@"70",@"260",@"10",@"150"]] andColoreLines:@[[UIColor redColor],[UIColor yellowColor],[UIColor cyanColor]]];
 
 

欢迎大家提出问题.