iOS 绘制饼图代码

CGContextAddArc(CGContextRef __nullable c,CGFloat x,CGFloat y,CGFloat radius,CGFloat startAngle,CGFloat endAngle,int clockwise)

CGFloat degree=(count/allCount)*(360.f-2*self.dataSource.count);

staticinlinefloat radians(double degrees) { return degrees *  M_PI/ 180.f;
}

- (void)drawRect:(CGRect)rect {
  CGContextRef context=UIGraphicsGetCurrentContext();
  //设置半径
  CGFloat radius=130.f;
  if (self.circularRingRadius==0) {
    self.circularRingRadius=54.f;
  }
  CGFloat intRadius=radius-self.circularRingRadius;
  //设置圆心的坐标
  CGFloat centerX=self.bounds.size.width/2.f;
  CGFloat centerY=self.bounds.size.height/2.f;
  //设置起始角度
  CGFloat pieStart=90.f;
  //设置旋转方向
  int clockwise=0; //1: 顺时针 ; 0:逆时针
  //画扇形
  if(allCount == 0){  //无资产
    CGContextSetFillColorWithColor(context,[HEXCOLOR(0xefeff4) CGColor]);
    CGContextMoveToPoint(context,centerX,centerY);
    CGContextAddArc(context,centerY,radius,radians(0),radians(360),clockwise);
    CGContextClosePath(context);
    CGContextFillPath(context);
  }else{
    for (int i=0; i<self.degreeArray.count; i++) {
      CGFloat end=pieStart+[self.degreeArray[i] doubleValue];
      if (self.isShowSeperate) {
        if(i%2==0){  //分割线
          UIColor *fillColor=self.colorArray[(int)(i/2)];
          CGContextSetFillColorWithColor(context,[fillColor CGColor]);
        }else{
          CGContextSetFillColorWithColor(context,[HEXCOLOR(0xefeff4) CGColor]);
        }
      }else{
        CGContextSetFillColorWithColor(context,[self.colorArray[i] CGColor]);
      }
      NSLog(@"%f",radians(end));
      CGContextMoveToPoint(context,centerY);
      CGContextAddArc(context,radians(pieStart),radians(end),clockwise);
      CGContextClosePath(context);
      CGContextFillPath(context);
      pieStart+=[self.degreeArray[i] doubleValue];
    }
  }
  //画内圆
  CGContextSetFillColorWithColor(context,[[UIColor whiteColor] CGColor]);
  CGContextMoveToPoint(context,centerY);
  CGContextAddArc(context,intRadius,radians(360.f),0);
  CGContextClosePath(context);
  CGContextFillPath(context);
}