AutoLayout Automatic Layout

AutoLayout has two core concepts:

Reference

Constraints

When the option to use Auto layout is selected, there are two more things left: Top layout Guide and Bottom layout guide

To represent the above and below ranges, click Top Layout Guide to find a line below the status bar. When you add a constraint, it is relative to the line.

How to delete a constraint: Select a constraint and press the DELETE key to

In the event of a warning, you can click the top button to fix it with update frames.

A second reference appears when the control to be constrained is below the top layout guide, and does not appear if the control's position exceeds the reference.

When adding a constraint, the default is to select the constrain to margins option so that when the left side wants to reach the edge, the value should be written as a negative number.

Or remove this option and fill in the value 0.

Reference: When you want a control to reference the position and size of another control, select more than two controls so that you can set

A reference to the selected control.

Reference not finished .... Continue tomorrow.

AutoLayout Automatic Layout