绘制一个真正的1像素线，iOS7 [英] Draw a genuine 1-pixel line, iOS7
问题描述
（A）iOS7在界面中使用正版1像素线是司空见惯的。
(A) It's commonplace that iOS7 uses genuine 1 pixel lines in interface.
（B）你可以轻松画一个 point 行（大概是每个人都知道点和像素之间的差异），在你的XIB中，通过使用1单位高的UIView，黑色背景。事实上，这是一个非常方便的事情，但它不会像1像素纯黑线那样绘制。
(B) You can easily draw a one point line (presumably everyone here knows the difference between points and pixels), in your XIBs, by using a UIView which is 1 unit high, with a black background. Indeed, this is a very handy thing, BUT it does not draw anything like a 1 pixel pure black line.
（C）当然，您可以使用精灵，一个PNG - 但那是可怜的。 （如果你不幸的话必须支持那些，那么在古老的非视网膜显示器上使它真正一致也非常困难。）
(C) You can, of course, use a sprite, a PNG - but that's pathetic. (It's also remarkably difficult to make it really consistent on the ancient non-retina displays, if you unfortunately must support those.)
是否有一种简单的添加方法，一些有点招数，添加一个真正的1像素黑线？水平还是理想垂直？
Is there a simple way to add, some sort of trick, to add a genuine 1-pixel black line? Horizontal or ideally vertical also?
（D）理想情况下，它会在界面构建器中甜蜜地工作，即你的xib中的wysiwyg！
(D) Ideally, it would work sweetly in interface builder, i.e. wysiwyg in your xib!
注意 ..对于任何想要这样做的人，我刚刚意识到基本问题是在界面构建器中，你可以热输入非整数金额。当然，在代码中你可以输入0.5（或更好，1.0 / [UIScreen mainScreen] .scale） - 这就是它！保存您输入的完整答案..
Note .. for anyone wanting to do this, I've just realised the fundamental issue is that in interface builder, you can hot enter non-integer amounts. Of course, in code you can enter 0.5 (or better, 1.0/[UIScreen mainScreen].scale)- so that's it! Full answer to save you typing..
https：// stackoverflow.com/a/22694062/294884
https://stackoverflow.com/a/22694062/294884
推荐答案
子类UIView，填写drawRect方法用你完成任务所需的任何代码。您可以将IB中的UIView子类默认为具有黑色背景，以便获得WYSIWYG的感觉，但是当它绘制时（通过代码），它可以更具体地满足您的需求。
Subclass UIView, fill in the drawRect method with whatever code you need to accomplish the task. You can default the UIView subclass in IB to have a black background so you get the WYSIWYG feel but when it draws (via code) it can be more specific to your needs.
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