Scrolling png with text & alpha on top of a static UIImageView

I have a view controller that has a view structure as follows:

FilesOwner
FirstResponder
View
   ImageView (.jpg)
   ScrollView
     ImageView (.png)

The text in the innermost imageview has white text and clear (alpha) all around. I want to scroll the innermost imageview, and see the background image (the .jpg) behind it.

Its not working. Its acting like the scrollview background obscures the underneath .jpg. I say this because if I change the background color of the scrollview, that's what I see i.e. if I set it black, I see black behind my .png, if I set it white, I see white. If I change the alpha of the scro开发者_开发百科llview that doesn't seem to work either. The one other thing I tried was unchecking drawing: Opaque, but that doesn't get it either.

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Try setting the alpha value of your scrollviews background color to 0 (not the alpha value of the scrollview itself). The scrollview should be set to not opaque.

(didn't try, just guessing...)