Custom UIView does not fit into its storyboard container when using autolayout

Question

How do you make a custom nib-loaded UIView/widget to fit into the container provided for it in storyboard? I.e, how do you make it to take up exactly the space specified, not more and not less?

Answer 1

What most likely is forgotten in this case is to add the following code in the context of loading the nib and adding it to the custom view's/widget's subviews:

UIView* rootView = [[[NSBundle mainBundle]
                    loadNibNamed:className owner:self options:nil] firstObject];
rootView.translatesAutoresizingMaskIntoConstraints = NO;

[self addConstraint:
 [NSLayoutConstraint
  constraintWithItem:rootView attribute:NSLayoutAttributeTop
  relatedBy:NSLayoutRelationEqual toItem:self attribute:NSLayoutAttributeTop
  multiplier:1.0f constant:0.0f]];

// And so on for all attributes (Bottom, Left, Right) that you want to
// constrain the loaded nib with.

(Where self is the custom uiview/widget instance in question.)