Using auto layout with a child UIViewController

SPAutoLayoutChildViewController.m

#import "SPAutoLayoutChildViewController.h"

@implementation SPAutoLayoutChildViewController

- (void)updateViewConstraints {
    if (self.view.superview) {
        UIView *thisView = self.view;
        thisView.translatesAutoresizingMaskIntoConstraints = NO;
        NSDictionary *views = NSDictionaryOfVariableBindings(thisView);
        [self.view.superview addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[thisView]|" options:0 metrics:nil views:views]];
        [self.view.superview addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[thisView]|" options:0 metrics:nil views:views]];
    }
    [super updateViewConstraints];
}

@end