NSLayoutAttribute explained

Question

I find the documentation a bit rare. Here is an example

NSLayoutAttributeTrailing The trailing edge of the object's alignment rectangle. Available in iOS 6.0 and later. Declared in NSLayoutConstraint.h 

In particular, I want all these explanations

 NSLayoutAttributeLeft NSLayoutAttributeRight NSLayoutAttributeTop NSLayoutAttributeBottom NSLayoutAttributeLeading NSLayoutAttributeTrailing NSLayoutAttributeWidth NSLayoutAttributeHeight NSLayoutAttributeCenterX NSLayoutAttributeCenterY NSLayoutAttributeBaseline NSLayoutAttributeLastBaseline NSLayoutAttributeFirstBaseline NSLayoutAttributeLeftMargin NSLayoutAttributeRightMargin NSLayoutAttributeTopMargin NSLayoutAttributeBottomMargin NSLayoutAttributeLeadingMargin NSLayoutAttributeTrailingMargin NSLayoutAttributeCenterXWithinMargins NSLayoutAttributeCenterYWithinMargins 

Answer 1

Stained it for conversation. It could have been better. Here is the PSD .