IOS gradient transparent mask over animated view

Question

Hello,

Seek an understanding of the guru.

I need a stack of three views:

A: view containing various buttons, text inputs.
B: A custom view containing a large view (B2) that moves and rotates and contains several subzones and another fixed view (B1) that has its own transparent gradient mask.
C: Image containing background image

I can't figure out how to make layer B1 work. I can make a gradient, but I'm not sure how to apply the mask so that it affects only the transparency of B2 subzones. I need background (C) to show all the way to the top view (A). Thought to use the mask directly on B2, but can not, as it moves. Confused

Any tips?

Answer 1

Have you tried using the mask layer of layer B? Try to set it to B1 (not as a sublevel / sublevel) and update its position if necessary when moving B2.