Can subviews resize their superview automatically with auto layout?

autolayout, ios

Solution

Yes, you can do that, and it can be done without any code or subclassing. For instance, if you have a label embedded in a view (with numberOfLines = 0), and it has constraints to to all the sides of the superview, as well as a width constraint, the label, and its superview will expand vertically if you put a large string in the label. The superview should still need to have some constraints, like one to the top and left side of its superview, but no size constraints.

Problem

If you have a view with no constraints on it, and that view has a subview with left, right, top and bottom constraints of equal size, if the subview's size is increased is it possible for the superview's size to automatically increase to accommodate these constraints? Thanks.

Original source