iOS layout why does center constraint not enough?

Question

I really don't understand the logic of this ... well ... strange iOS layout system.

I place a UILabel with the constraint Align center X to Superview.

Why does it complain to need a new constraint for X position ??

center is center no?

Answer 1

You need to tell more about the horizontal positioning of the view. Centering the view does not say wether it has a fixed width or it should keep the leading / trailing space around view.

Here are two possible options (there is also a fixed height with a fixed aspect ratio, as @Moshe said in his answer):

1. Your view will always have a width of 61 (for example):

2. Your view will have a fixed leading and trailing space on the left/right side: