Adding priority to layout constraints

Question

I have a label and button in a superView like this.

|--------------[Label]-----[button]-|

I\'d like the

Answer 1

You just set the priority property of the constraint, like so:

NSLayoutConstraint *centeringConstraint = 
    [NSLayoutConstraint constraintWithItem:_label
                                 attribute:NSLayoutAttributeCenterX
                                 relatedBy:NSLayoutRelationEqual
                                    toItem:self.contentView
                                 attribute:NSLayoutAttributeCenterX
                                multiplier:1.0
                                  constant:0.0];

centeringConstraint.priority = 800; // <-- this line

[self addConstraint:centeringConstraint];