Draw a genuine 1-pixel line, iOS7 [duplicate]

Question

This question already has an answer here:

• How to Draw a single point line in iOS 5 answers

(A) It's commonplace that iOS7 uses genuine 1 pixel lines in interface.

(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) 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.)

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) Ideally, it would work sweetly in interface builder, i.e. wysiwyg in your xib!

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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

Answer 1

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.