折线图-带阴影

lineGraphSingle.png

LineGraph.png

源码参考

<h5>
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
</h5>
<h6>
下面开始介绍如何绘制折线图，达到以上的效果。
</h6>
<h6>
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.
</h6>
<pre>

  • (void)LineGraphViewY_datasArray:(NSArray *)y_datasArray andColoreLines:(NSArray *)coloreLines;
    </pre>
    <h6>
    第二步:绘制X 轴 坐标,Y轴坐标
    </h6>
    <pre>

  • (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;
    }
    </pre>

<h6>
计算最大值,最小值 坐标,及数据
</h6>
<pre>
/**
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;
    }

</pre>
<h6>
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.
</h6>
<h6>
第三步:绘制折线
</h6>

<pre>
/**
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"];

}
</pre>

<h6>
第四部:绘制阴影
</h6>
<pre>
// 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);

    }
    }
    </pre>

<h6>
使用方法
</h6>
<pre>
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]]];
</pre>

<pre>
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]]];

</pre>
<h6>
欢迎大家提出问题.
</h6>

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