Question

I have main view and i added subview to it. I set subview’s background to be semi transparent, but subview is drawn in solid color. I even tried setting opaque to NO.

detailsView.opaque = NO;
detailsView.backgroundColor = UIColorMakeRGBA(0, 0, 100, 100);

I can make the vsubview to be transparent via alpha property (but all things on subview will also be transparent), but i really want just to set background color to be semi transparent.

Answer 1

Set alpha to desired value in colorWithRed:green:blue:alpha method

detailsView.backgroundColor = [UIColor colorWithRed:0/255.0f 
                                              green:30/255.0f 
                                               blue:160/255.0f 
                                              alpha:0.5f];