iphone - how can i set part of the view appear at its child view -

on child view, set backgroundcolor picture have transparent part.

[viewdown setbackgroundcolor:[[uicolor alloc] initwithpatternimage:[uiimage imagenamed:@"background_down.png"]]]; 

the transparent part don't have parent view's background, black color instead.

how can this.

thanks.

set opaque property no.

viewdown.opaque = no;