CustomViewsWithAutoLayout1.m

- (void)drawRect:(NSRect)dirtyRect {
    CGFloat blurRadius = self.blurRadius;
    NSSize shadowOffset = NSMakeSize(0, -self.blurOffset);
    NSImage *circularImage = [self.image maskedCircularImageWithDiameter:self.circleDiameter];
    
    NSRect rect = NSMakeRect(blurRadius, blurRadius + self.blurOffset, circularImage.size.width, circularImage.size.height);
    
    NSShadow *shadow = [NSShadow new];
    shadow.shadowBlurRadius = blurRadius;
    shadow.shadowOffset = shadowOffset;
    shadow.shadowColor = [NSColor blackColor];
    [shadow set];
    
    [circularImage drawInRect:rect fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1.0];
}