ios - Why can't I add pin constraints in Xcode? -


i'm reading book "learn ios 8 app development". i'm following steps , here problem:

add new constraints pop-up

he asked deselect "constrain margins". down little square has 4 controls, , have 3 (the align, square, , triangle). why can't add 4 constraints does? didn't select nothing , it's written in computer "add 4 constraints".

you need click on each of 4 orange i-beams turn them dashed solid. button change add 4 constraints.

add4constraints


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