Developer Handover.

This is an iOS project for an iPad that I'm working on.

Curious to know whether any other UI Designers place, what I guess we would essentially call "spacer gifs" into their designs to show the developers specific spacing between elements?

I have mine in a folder in PS that I toggle on and off, to help with spacing and positioning during my design phase.

Inspired by @Jeff Broderick's excellent post about how he hands over design assets, it got me thinking about my own process.