Understanding "firstBaseLine" vs. "baseLine" AutoLayout Constraint

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I've created the following view that looks as follow:

screenshot 1

And used Add missing constraints t automatically add constraints. I am pretty new in iOS world and I'm trying to configure out how constraints work.

On document outline, I can see the added constraints:

screenshot 2

I click on label UR and Size inspector show me following:

screenshot 3

What is the difference between constraints aligned by first baseline to UL and aligned by baseline to UL? When I click on the size inspector on constraints button, it shows me the same line.

3 Answers

In the image you can see a simple visual example using both baseline constraint. It is quite illustrator.

example

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