'NSInvalidArgumentException', reason: 'Unable to parse constraint format'

Question

I have a subview that I want to keep stops during rotating screen, so I decided to put the NSLayoutConstraint type:

Trailing Space to Superview
Top Space to Supe

Answer 1

Easiest solution is to avoid the getters for variables from your own class and redefine variables from superclasses as local variables. A solution for your example is

UIView *contentView = self.contentView;
NSDictionary *viewsDictionary = NSDictionaryOfVariableBindings(_arrows, contentView);