objective c - UIScrollView - transparent PNG sliding over an image background -

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trying png transparency appear in uiscrollview. instead of transparent black now. tried set view.opaque = no, , view.backgroundcolor = [uicolor clearcolor] no avail.

rootviewcontroller has image background set 

self.view.opaque = no;     self.view.backgroundcolor = [uicolor colorwithpatternimage:[uiimage imagenamed:@"appbackground.png"]];

rootviewcontroller has uiscrollview load other 2 uiviewcontroller views (leftscreen, centralscreen) into:

cgrect frame = scrollview.frame; frame.origin.x = 0;   frame.origin.y = 0; leftscreen.view.frame = frame; [scrollview addsubview:leftscreen.view];  frame.origin.x = frame.size.width; frame.origin.y = 0; centralscreen.view.frame = frame; [scrollview addsubview:centralscreen.view];

the centralscreen.view has 24bit transparent png background set in uiviewcontroller with

self.view.opaque = no;     self.view.backgroundcolor = [uicolor colorwithpatternimage:[uiimage imagenamed:@"homepagetext.png"]];

in end centralscreen background png has black transparency should be. recommendations/hints on how fix this? thanks!

you should not use backgroundcolor that, 'cause lost control on how image draw (i.e.: can't resize it). suggest put uiimageview "background" (add use sendsubviewtoback:).


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