I've updated to Xcode 10. It is awesome, but there is just one problem for me: in Xcode for measuring distance between UI elements you just needed to press option button, but now it's not working.
Is there any suggestions?
Can't reproduce. Select a subview, hold Option, hover the mouse off the subview, measurements appear. Works in Xcode 10 exactly as in the past.
Perhaps you're making the gesture incorrectly?