xcode - Understanding Auto Layout: what do the options in Pin and Align do? -


i'm venture unknown territory auto layout, and, giving look, cannot decipher functionalities in "pin" , "align" tabs do. i'm using xcode 7.1.2 interface screen 600x600.

"spacing nearest neighbor". if i'm dealing borders, neighbor top of screen?

in "align", if check off "horizontally in container", mean? furthermore, number box next it?

here's example: have label, position (140, 40) , centered (equal width either side, left , right). it's width 320 , height 51. want make sure label 40 points top of screen, can expand in height , width without losing it's centering when iphone screen size increased.

thanks


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