Hi Sirs,
I follow the Intro to Object-Oriented Design: Part ½ step by step. But I met an issue. When I select the the vehicle mode, it moves to the detail page. But the “Lablel”, “Go Forward” and “Stop Moving” don’t show up Please refer to the screenshot as following. I checked the storeboard the layout looks fine. Please could I have your guide to fix it? Thanks!
Corydon
Hi @croydon and thanks for the post!
Unfortunatly it’s been over 6 months since this tutorial was last updated so we no longer support issues with the tutorial specifically. However i’ll try my best to point you in the right direction… It looks like there might be some constraint issues as I think I can see the other buttons under the nav bar? I’d suggest checking the constraints in the storyboard to ensure that the top of the content is pinned to the bottom of the top layout guide.
I hope that helps! 
Thanks Liam. You are right. The constraint is the root cause. Fixed!
Corydon
