How to apply shadows to UIBezierPath

suggest change

Consider a simple rectangle that is drawn by the bezier path.

UIBezierPath* rectanglePath = [UIBezierPath bezierPathWithRect: CGRectMake(x,y,width,height)];
[UIColor.grayColor setFill];
[rectanglePath fill];

Basic Outer-fill shadow:

CGContextRef context = UIGraphicsGetCurrentContext();

NSShadow* shadow = [[NSShadow alloc] init];
[shadow setShadowColor: UIColor.blackColor];
[shadow setShadowOffset: CGSizeMake(7.1, 5.1)];
[shadow setShadowBlurRadius: 5];

UIBezierPath* rectanglePath = [UIBezierPath bezierPathWithRect: CGRectMake(x,y,width,height)];
CGContextSaveGState(context);
CGContextSetShadowWithColor(context, shadow.shadowOffset, shadow.shadowBlurRadius, [shadow.shadowColor CGColor]);
[UIColor.grayColor setFill];
[rectanglePath fill];
CGContextRestoreGState(context);

Basic Inner fill shadow:

CGContextRef context = UIGraphicsGetCurrentContext();

NSShadow* shadow = [[NSShadow alloc] init];
[shadow setShadowColor: UIColor.blackColor];
[shadow setShadowOffset: CGSizeMake(9.1, -7.1)];
[shadow setShadowBlurRadius: 6];

UIBezierPath* rectanglePath = [UIBezierPath bezierPathWithRect: CGRectMake(x,y,width,height)];
[UIColor.grayColor setFill];
[rectanglePath fill];

CGContextSaveGState(context);
UIRectClip(rectanglePath.bounds);
CGContextSetShadowWithColor(context, CGSizeZero, 0, NULL);

CGContextSetAlpha(context, CGColorGetAlpha([shadow.shadowColor CGColor]));
CGContextBeginTransparencyLayer(context, NULL);
{
    UIColor* opaqueShadow = [shadow.shadowColor colorWithAlphaComponent: 1];
    CGContextSetShadowWithColor(context, shadow.shadowOffset, shadow.shadowBlurRadius, [opaqueShadow CGColor]);
    CGContextSetBlendMode(context, kCGBlendModeSourceOut);
    CGContextBeginTransparencyLayer(context, NULL);

    [opaqueShadow setFill];
    [rectanglePath fill];

    CGContextEndTransparencyLayer(context);
}
CGContextEndTransparencyLayer(context);
CGContextRestoreGState(context);

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