subclass: drawRect: gets called, but drawing doesn't appear

[waldstein]

So I just quickly wanted a StrikableTextField, subclass of UITextField,
with a "striked" property and a modified drawRect:

However even though I make sure it gets called and it does so, the drawing I do there has no effect. Very strange. I've absolutely no clue now, so I'm asking for your help.
Even more strange, even if I comment out the [super drawRect:rect], the view draws itself correctly. I've set the class in Interface Builder, yes, I tripled checked that.

- (void)drawRect:(CGRect)rect
{
    // [super drawRect:rect];
    if (striked) {
        NSLog(@"now striking through");
        [[UIColor redColor] set];
        UIRectFill([self bounds]); // also doesn't draw
        
        UIBezierPath *path = [UIBezierPath bezierPath];
        [path moveToPoint:CGPointMake(0, 0)];
        [path addLineToPoint:CGPointMake(rect.size.width, rect.size.height)];
        [path stroke];
    }
}

grateful for any light on this