UIScrollView setZoomScale:animated messes scrollView aspect ratio

Question

I am developing an app with a view that holds a UISCrollView, inside which is a UIImageView.

When the view is about to appear, I perform a setZoomScale operation:

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Answer 1

Ok, after a lot of tries I finally got it working! I don't know exactly what was causing the problem, but with the scrollView selected in the storyboard I selected the Attributes Inspector inside XCode, and then unchecked "Autoresize Subviews". After unchecking it, it all works ok. The scrollView is correctly resized.

I solved this but don't understand what's causing the problem, so if you know why this happens feel free to comment!