How to implement a “selective” clipToBounds for a UIView, i.e. clip some subviews but not others?

I solved my problem in the following way. When the subview of the scrollview receives a touchesBegan:withEvent: I set the alpha of that subview to 0.0. I then create an identical subview and add it to the scrollview's superview.

For the initial position I use the following.

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