##Before
NSLayoutConstraint *left = [NSLayoutConstraint constraintWithItem:self.titleBar
attribute:NSLayoutAttributeLeft
relatedBy:NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeLeft
multiplier:1.0 constant:10.0];
NSLayoutConstraint *top = [NSLayoutConstraint constraintWithItem:self.titleBar
attribute:NSLayoutAttributeTop
relatedBy:NSLayoutRelationEqual
toItem:self.view
attribute:NSLayoutAttributeTop
multiplier:1.0 constant:10.0];
NSLayoutConstraint *width = [NSLayoutConstraint constraintWithItem:self.titleBar
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:nil
attribute:NSLayoutAttributeNotAnAttribute
multiplier:1.0 constant:50.0];
NSLayoutConstraint *height = [NSLayoutConstraint constraintWithItem:self.titleBar
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:nil
attribute:NSLayoutAttributeNotAnAttribute
multiplier:1.0 constant:50.0];
##After
NSLayoutConstraint *left = constraintLeft(self.titleBar, self.view, 10);
NSLayoutConstraint *top = constraintTop(self.titleBar, self.view, 0);
NSArray *sizeConstraints = constraintsEqualSize(self.titleBar, nil, 50, 50);