I upgraded my Xcode today to 11 and just realised that Xcode doesn\'t allow me to create proportional height from a sub view to the view controller\'s root view anymore. I w
First do "Equal Widths " to any other UIView element .
Go to Attributes inspector of the equal width contraint .
Replace the Second Item with Superview.Width.
credits: https://forums.developer.apple.com/thread/123284