ios – CGContext线宽

我试图绘制一条简单的线,问题是它的宽度不是1像素,而是2.如果我正确读取,文档说明用户空间单位将转换为像素.

代码很简单,但我的行总是2像素宽.

//Get the CGContext from this view
CGContextRef context = UIGraphicsGetCurrentContext();
//Set the stroke (pen) color
CGContextSetStrokeColorWithColor(context,[UIColor blueColor].CGColor);

//Set the width of the pen mark
CGContextSetLineWidth(context,1);

for (int i = 1; i <= sections - 1; i++)
{
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path moveToPoint:CGPointMake(0.0,i * kSectionHeight)];

    CGContextMoveToPoint(context,0.0,i * kSectionHeight); //Start point
    CGContextAddLineToPoint(context,self.frame.size.width,i * kSectionHeight);
}

CGContextStrokePath(context);