IOS - view order when creating a constraint

Question

When creating a constraint (programmatically or from an interface constructor) does the order of representations matter? Does it matter what is the first element and is the second element?

Answer 1

Yes, this is because the value is constantadded to the second element to determine the value of the first element.

So, if you have label2.leading = label1.trailing + 45, you will get something like:

But if you have label1.trailing = label2.leading + 45, you get:

label1 45 label2, , label2 label1

label1.trailing = label2.leading + -45, , :

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" Interface Builder", . , .