Conrad Stoll takes a look at the APIs available if you want to query motion information from the new M7 chip in the iPhone 5s and new iPads. The obvious use of these APIs are in fitness and "pure" motion tracking apps but I liked the comments at the bottom of the post about the use of the M7 in Day One and it set me wondering where else we will see this data popping up in the future.
Unfortunately the contentView property which was hinted at during iOS 7 betas never materialised and modifying the view hierarchy has always been discouraged by Apple. Love it or hate it, Scott Berrevoets has put together a pixel perfect complete replacement for UIAlertView. He has concentrated on getting the basics right first but also has plans for adding a block based syntax and other features going forward. If you can't avoid UIAlertView altogether then this might be some salvation.
Understanding the properties which affect view positioning was one of the breakthrough moments for me when I was learning Mac development. This post by Bartosz Ciechanowski takes an in depth look at how views on the screen get where they are meant to be.