Getting the minimum size of a UIView based on its constraints

Question

I have created a custom nib and added it to my view hierarchy. The view separates to subviews using a constraint which is greater than or equal to, in other words, giving the view a minimum size to work with.

Is it possible to get the minimum size of a UIView from the constraints system?

Answer 1

UIView has a method systemLayoutSizeFittingSize: to return the smallest size (or largest size) for a view.

CGSize smallestViewSize = [view systemLayoutSizeFittingSize: UILayoutFittingCompressedSize];

The UIView method intrinsicContentSize returns the most desired size. This size may be somewhat in the middle of the two sizes returned before.

Prior to iOS6, you would call sizeThatFits: to get a fitting size that may be smaller than the size passed in or was by default the bounds of the receiver.