UIView drawRect: Draw the inverted pixels, make a hole, a window, negative space

Question

With the code below I am drawing a rounded rectangle. It draws a nice solid light gray filled rounded rectangle (at the size of \"self\"). I actually want to draw the pixel

Answer 1

Here's yet another approach, using just UI object calls:

- (void)drawRect:(CGRect)rect
{
    [[UIColor lightGrayColor] setFill];
    CGRect r2 = CGRectInset(rect, 10, 10);
    UIBezierPath* p = [UIBezierPath bezierPathWithRoundedRect:r2 cornerRadius:15];
    [p appendPath: [UIBezierPath bezierPathWithRect:rect]];
    p.usesEvenOddFillRule = YES;
    [p fill];
}

Yields this:

The white is the background of the window; the grey is the UIView. As you can see, we're seeing right thru the view to whatever is behind it, which sounds like what you're describing.