CALayer：单像素行看起来像2像素 [英] CALayer: Single pixel line looks like 2 pixels

问题描述

这是我的代码：

int columns 3;
int columnWidth = self.layer.bounds.size.width / 3;

for (int c = 1; c < columns; c++) {
    CALayer *layer  = [CALayer layer];
    layer.frame = (CGRectMake(columnWidth * c + 0.5, 0.5, 1, self.layer.bounds.size.height));
    layer.backgroundColor = myColor;
    [grid addSublayer:layer];
}

我理解我必须移动x和y 0.5像素，这是我已经做了，但它仍然显示为2像素线而不是1。

I understand that I have to shift the x and y 0.5 pixels, which is what I have done, yet it still shows as a 2 pixel line instead of 1.

推荐答案

将图层框架设置为

layer.frame = (CGRectMake(columnWidth * c + 0.5, 0.5, 0.5, self.layer.bounds.size.height));

是的，它也适用于视网膜。

Yeah it will work for retina also

查看此帖子部分 1点线和像素边界。很好地解释了

Check this post Section 1 Point Lines and Pixel Boundaries.It is well explained there

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