问题
I am simply adding a UIView into the main view of a view controller. I want the height to always be 64px, but the width to stretch to the width of the screen.
However, when I go to add constraints, the left and right padding default to -16, even though the view is stretched all the way across its parent view. Even if I set these back to 0, when I run the app the -16 padding is added back in. What is going on here?
回答1:
Uncheck "Constrain to margins" checkbox in the pin menu (the first image in the question) while adding spacing to nearest neighbor for the new constraints.
来源：https://stackoverflow.com/questions/25815396/xcode-auto-layout-constraints-why-defaulting-to-negative-padding