Disabling Autoresizing Constraints
Autoresizing refers to the struts-and-springs layout tools used in IB and to the autoresizing flags, like UIViewAutoresizingFlexibleWidth, used in code. When you lay out a view’s resizing behavior with these approaches, that view should not be referred to in any constraints you define.
When you move into the constraints world, you start by disabling a view property that automatically translates autoresizing masks into constraints. As a rule, you either enable this, allowing the view to participate in the constraint system via its autoresizing mask, or you disable it entirely and manually add your own constraints.
The constraints-specific property in question is translatesAutoresizingMaskInto-Constraints. Setting ...
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