UIScrollView + Auto Layout, no frames no contentSize

ScrollViewController.m

    UIScrollView *scrollView = [UIScrollView new];
    scrollView.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:scrollView];
    
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[scrollView]|"
                                                                      options:0
                                                                      metrics:nil
                                                                        views:@{@"scrollView" : scrollView}]];
    
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[scrollView]|"
                                                                      options:0
                                                                      metrics:nil
                                                                        views:@{@"scrollView" : scrollView}]];
    
    UIImageView *previousImageView = nil;
    
    for (int i = 0; i < 10; i++) {
        
        UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image"]];
        imageView.translatesAutoresizingMaskIntoConstraints = NO;
        [scrollView addSubview:imageView];
        
        [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[imageView]"
                                                                           options:0
                                                                           metrics:nil
                                                                             views:@{@"imageView" : imageView}]];
        if (!previousImageView) {
            [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[imageView]"
                                                                               options:0
                                                                               metrics:nil
                                                                                 views:@{@"imageView" : imageView}]];
        } else {
            [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[previousImageView][imageView]"
                                                                               options:0
                                                                               metrics:nil
                                                                                 views:@{@"imageView" : imageView,
                                                                                         @"previousImageView" : previousImageView}]];
        }
        
        previousImageView = imageView;
    }
    
    [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[previousImageView]|"
                                                                       options:0
                                                                       metrics:nil
                                                                         views:@{@"previousImageView" : previousImageView}]];
    
    [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[previousImageView]|"
                                                                       options:0
                                                                       metrics:nil
                                                                         views:@{@"previousImageView" : previousImageView}]];