Enable VoiceOver, then create a new iOS app in Xcode. Add a couple items to the canvas of main.storyboard (I used a text field and a button).
Now inspect the items. Select your storyboard, then interact with the editor area, then the group for your storyboard file. Interact with the canvas layout area, then your view, your view again, and finally locate the two items you added to the canvas. Press vo-cmd-f3 on them; despite them being normal size, VO reports them as being zero points wide and tall.