I’ve mentioned a few resources to aid with implementing your designs most recently dspec-iOS which allows you to draw a customizable grid over your user interface to ensure proper component alignment.
Here’s an open source library called ViewMonitor that easily allows you to track the position of any UIView along with other relevant details submitted by Daisuke Yamashita.
ViewMonitor can work with all types of UIViews including UITableViews, and displays the position, size, coloring, and font details of each selected view to help make sure views so you can make sure that any views match up with your design sheet.
Here’s an animation from the readme showing ViewMonitor in action:
You can find ViewMonitor on Github here.
A nice library to aid in checking design of an app.