1 CALayer *layer = [[self.view.layer sublayers] objectAtIndex:0];    layer.shadowPath = (layer.shadowPath) ? nil : [self bezierPathWithCurvedShadowForRect:layer.bounds2 ].CGPath;

 

1    static const CGFloat offset = 10.0; 2    static const CGFloat curve = 5.0; 3 - (UIBezierPath*)bezierPathWithCurvedShadowForRect:(CGRect)rect { 4      5     UIBezierPath *path = [UIBezierPath bezierPath];     6      7     CGPoint topLeft         = rect.origin; 8     CGPoint bottomLeft     = CGPointMake(0.0, CGRectGetHeight(rect) + offset); 9     CGPoint bottomMiddle = CGPointMake(CGRectGetWidth(rect)/2, CGRectGetHeight(rect) - curve);    10     CGPoint bottomRight     = CGPointMake(CGRectGetWidth(rect), CGRectGetHeight(rect) + offset);11     CGPoint topRight     = CGPointMake(CGRectGetWidth(rect), 0.0);12     13     [path moveToPoint:topLeft];    14     [path addLineToPoint:bottomLeft];15     [path addQuadCurveToPoint:bottomRight controlPoint:bottomMiddle];16     [path addLineToPoint:topRight];17     [path addLineToPoint:topLeft];18     [path closePath];19     20     return path;21 }