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The Objective-C method for creating constraints constraintWithItem:attribute:relatedBy:toItem:attribute:multiplier:constant tells you to pass in nil for the toItem:(view2) parameter if the constraint isn't specifying a relationship between multiple views
When I try to pass in null to the equivalent Xamarin.Mac method NSLayoutConstraint.Create, I get a null reference exception.
Fixed in monomac/master: e932285f7d0c88f9a49b3e29ae441b19c1ce8da7
Xamarin.Mac 705f3d98f111b368761b7339d01f98e6fb31b98f (1.3.13+)