ARTICLES
How to align UIView to topLayoutGuide in SnapKit
Use topLayoutGuide.snp.bottom
to align your UIView to the bottom of the navigation bar or the bottom of the status bar in Swift 3 while using the SnapKit pod.
Use bottomLayoutGuide.snp.top
to align your UIView to the top of the tab bar.
Source: https://github.com/SnapKit/SnapKit/issues/91