iOS: Using CGColorRef to use an RGB color to add drop shadow

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    //CGColorRef pixelColor = [[UIColor redColor] CGColor];
    // UIColor* color = [UIColor colorWithCGColor:pixelColor];
 
    CGColorRef*  aqua = [UIColor colorWithRed:0.521569 green:0.768627 blue:0.254902 alpha:1] CGColor];            
    layer.masksToBounds = NO;
    layer.shadowRadius = 1.0f;
    layer.shadowOpacity = 0.5f;
    layer.shadowColor = aqua; // (__bridge CGColorRef)([UIColor grayColor]); // use bridge when it's not a CGColorRef type
    layer.shadowOffset = CGSizeMake( 4.0f, 5.0f);
    layer.shouldRasterize = YES;
    layer.borderWidth = 0.8;

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