pixel perfect apps techniques

While doing your iOS app development, do you try to achieve pixel perfect similarity? Is your app identical to provided photoshop designs?

If yes, what techniques are you using to speed this process up? I find it really time-consuming, since:

• I'm using a lot of custom component which aren't displayed in interface builder.


• Text field boundaries size are different in XCode and Photoshop. So I can't just copy position.


• Some of the properties are not easily modify-able. I've got a lot of custom-sized buttons, and changing text baseline is difficult


• etc...

I'm aware about tools like Reveal or SparkInspector - they speed things up, but it's not a dramatic boost for me. I know also that with XCode 6 you can use IBDesignable. I'm stucked with 32bit app right now, so I can't use it yet (and not sure how useful is it).

So, is it really so time consuming? If you're trying to achieve pixel-perfection in your projects, how much time do you usually spend on this? (E.g. on average per screen?)