In my app, I tried to use scroll view. But I encountered an issue where the scroll view added space at the top and bottom, as mentioned in the following question.
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I had exactly the same issue. This is how it worked for me. I added a screen shot of my object hierarchy
The imageView is placed under the navigation bar. Top, right, left constraints are set to 0 relative to content view. When I run the app my image appears right below the navigation bar.