Align Toolbar Item to split view content unsing Auto Layout Constraints

Question

I would like to align a button in the toolbar of an os x app to the position of a split view in the window, similar to the delete button in Apple Mail. How can this be done

Answer 1

I know it's a bit old, but I had the same issue and found an answer:

You have to use topLayoutGuide property.

Ex in swift

view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormats(
        ["H:|[toolbarShadow]|", "V:[topLayoutGuide][toolbarShadow(100)]"], 
views: viewDictionnary))

Of course topLayoutGuide must be in your view dictionary

You can access it through self.topLayoutGuide