ios - Conditional overlapping view transparency? -

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i have few moving views semi-transparent, @ point overlapping. possible make overlapped part "invisible" through top view? example, 3 uiviews background (which stationary) , 2 subviews (the semi-transparent ones) , when overlap lower subview "invisible" under top subview, while can still see background view , part of lower subview isn't overlapping other view. here's image clarify before , after overlap.

before overlap:

before image after overlap: after image (the view on far right looks little strange because blends white background)


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