Layering & Transparency with other UIViews

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i want launch native ios uiview native extension , put behind air(stage) layer. need make air stage transparent have awesome vector 2d art on native uiview.

 

so far i've learned...

 

uiview *mainview = [uiapplication sharedapplication].keywindow;

mainview.opaque = no;

mainview.backgroundcolor = [[uicolor blackcolor] colorwithalphacomponent:0.5f];

 

does not work. if air rewriting color ot's stage color.

 

but...

mainview.alpha = .5f;

has effect, makes whole air layer transparent.

 

so i'm still expermenting, time running out...

 

am on right track?

is possible layering , alpha stage?



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