How to center a label horizontally for all iOS devices in Swift

问题

I can't figure out how to make the label horizontally center in a image view, The label says "You've been here. What would you rate us, I want the What would you rate us to be under the "You've been here." What I attempted to do accomplish this was to add 2 lines to the labels and select the label plus the 3 buttons and clicked on "Add Missing Constrains". When I run the program this is the result.

How can I fix it so the text is entered on all devices?

Constrains

回答1:

for your label try to add constraints like:

Add top, width and height constraints as shown in below screen shot and make sure that constraints to margins is uncheck.

And set horizontal center constraints.

回答2:

Add Vertical top spacing for the particular imageview
Add center horizontal at in same imageview
Then adjust the leading and trailing as same as drag and drop way. it just easy.

回答3:

just use this code :

yourLabel.translatesAutoresizingMaskIntoConstraints = YES;
CGPoint centerPoint = yourLabel.center;
centerPoint.x = yourImageView.center.x;
yourLabel.center = centerPoint;