How to erase piece of UIImageView with png-brush and UIBezierPath

I have two UIImageView, first above second. I want to erase piece of the first image with brush (brush is a png picture with soft edge) to make piece of the second image visible. I did that by this way: 1) touchesMoved and [self setNeedsDisplayInRect:[self brushRectForPoint:touch_location]]; 2) at (void)drawRect:(CGRect)rect I call [_brush drawAtPoint:touch_location blendMode:kCGBlendModeDestinationOut alpha:1]; It works ok, but frequency of touchesMoved not enough, if user moves finger too fast then I get a lot of short lines (or even points) instead of one long line. I found information of UIBezierPath and example but author just draws lines by path: ``` CGContextRef context = UIGraphicsGetCurrentContext(); CGContextAddPath(context, path); CGContextSetLineCap(context, kCGLineCapRound); CGContextSetLineWidth(context, self.lineWidth); CGContextSetStrokeColorWithColor(context, self.lineColor.CGColor); CGContextStrokePath(context); ``` How I can draw my png brush with UIBezierPath? I need something like this Thanks a lot!